Bibliography

Overview

• arXiv.org
• astro sapiens
• Astronomical Journal (AJ)
• Astronomische Nachrichten
• Astronomy
• Astronomy & Astrophysics
• Astronomy Letters
• Astrophysical Journal (ApJ)
• Astrophysics Data System (ADS)
• Boooks and Atlases
• Bulletin of the Astronomical Institute of Czechoslovakia
• Centre de Données astronomiques de Strasbourg (CDS)
• ETH Bibliothek Zürich
• European Southern Observatory (ESO)
• European Space Agency (ESA)
• International Astronomical Union (IAU)
• Interstellarum
• Memoirs of the Royal Astronomical Society
• Monthly Notices of the Royal Astronomical Society (MNRAS)
• NASA/IPAC Extragalactic Database (NED)
• National Aeronautics and Space Administration (NASA)
• National Science Foundation (NSF)
• Publications of the Astronomical Society of the Pacific (PASP)
• Revista Mexicana de Astronomía y Astrofísica
• Sky & Telescope
• Software
• Space Telescope Science Institute (STScI)
• Sterne und Weltraum
• Students for the Exploration and Development of Space (SEDS)
• The Royal Society Publishing
• Wikipedia
• WWW et al.

arXiv.org

• [202] «The Horsehead nebula, a template source for interstellar physics and chemistry» Maryvonne Gerin (LERMA), Jérôme Pety (IRAM), Javier R. Goicoechea; arXiv:0905.3625; arxiv.org/abs/0905.3625 (2020-12-28)
• [238] «A dwarf galaxy's transformation and a massive galaxy's edge: autopsy of kill and killer in NGC 1097» N. C. Amorisco, D. Martinez-Delgado, J. Schedler; arXiv:1504.03697; arxiv.org/abs/1504.03697 (2021-01-20)
• [263] «Two distinct sequences of blue straggler stars in the globular cluster M30» F. R. Ferraro, G. Beccari, E. Dalessandro, B. Lanzoni, A. Sills, R. T. Rood, F. Fusi Pecci, A. I. Karakas, P. Miocchi, S. Bovinelli; Published on the 24th December 2009 issue of Nature; arXiv:1001.1096; DOI:10.1038/nature08607; arxiv.org/abs/1001.1096 (2021-02-08)
• [266] «The Pleiades: the celestial herd of ancient timekeepers» Amelia Sparavigna; arXiv:0810.1592; arxiv.org/abs/0810.1592 (2021-02-12)
• [318] «The electron temperatures of HII regions S 201, S 206 and S 209: multi-frequency GMRT observations.» Omar, A.; Chengalur, J. N.; Roshi, D. A.; Bulletin of the Astronomical Society of India, Vol. 30, p. 705-706 (2002); arXiv:astro-ph/0205061; DOI:10.48550/arXiv.astro-ph/0205061; Bibcode:2002BASI...30..705O
• [560] «Sejong Open Cluster Survey. I. NGC 2353» Beomdu Lim (Sejong Univ), Hwankyung Sung (Sejong Univ), R. Karimov (UBAI), M. Ibrahimov (UBAI); Journal of The Korean Astronomical Society, vol. 44, issue 2, pp. 39-48, April 2011; arXiv:1103.4927; DOI:10.5303/JKAS.2011.44.2.39; Bibcode:2011JKAS...44...39L

astro sapiens

• [29] «Im Fadenkreuz: NGC 7662, NGC 7209, Granatstern» von Markus Hägi; astro*sapiens 3/91, S.52; DOI:10.5169/seals-896895
• [30] «Im Fadenkreuz: Omikron 2, NGC 1535» von Markus Hägi; astro*sapiens 4/91, S.7; DOI:10.5169/seals-896898
• [31] «Die Fehler in Messiers Katalog» von Xavier Donath; astro*sapiens 4/91, S.39; DOI:10.5169/seals-896904
• [32] «Die Galaxien des Virgo-Haufens» von Hans-Rudolf Frei; astro*sapiens 1/92, S.15; DOI:10.5169/seals-896911
• [33] «Im Fadenkreuz: NGC 2683, NGC 2419, NGC 2371/2» von Markus Hägi; astro*sapiens 1/92, S.35; DOI:10.5169/seals-896913
• [34] «Im Fadenkreuz: 30/31 Cygni, SAO 49338, NGC 6826, NGC 6811» von Markus Hägi; astro*sapiens 2/92, S.18; DOI:10.5169/seals-896921
• [35] «Im Fadenkreuz: NGC 7027, Humason 1-2» von Markus Hägi; astro*sapiens 3/92, S.29; DOI:10.5169/seals-896931
• [36] «Im Fadenkreuz: NGC 457, Messier 103» von Markus Hägi; astro*sapiens 4/92, S.26; DOI:10.5169/seals-896943
• [37] «Im Fadenkreuz» von Markus Hägi; astro*sapiens 3/93, S.6; DOI:10.5169/seals-896853
• [38] «Im Fadenkreuz: Die Lösung!» von Markus Hägi; astro*sapiens 4/93, S.51; DOI:10.5169/seals-896866
• [39] «Im Fadenkreuz: NGC 2392, South 548» von Markus Hägi; astro*sapiens 1/94, S.25; DOI:10.5169/seals-896952
• [40] «Auch M51 Hat Eine Supernova!» von Stefan Meister; astro*sapiens 2/94, S.6; DOI:10.5169/seals-896957
• [41] «Im Fadenkreuz: M 51, ξ Ursae Maioris» von Markus Hägi; astro*sapiens 2/94, S.52; DOI:10.5169/seals-896968
• [42] «Im Fadenkreuz: NGC 6934, NGC 6905» von Markus Hägi; astro*sapiens 3/94, S.48; DOI:10.5169/seals-896978
• [43] «Im Fadenkreuz: Messier 77, NGC 1055» von Markus Hägi; astro*sapiens4/94, S.33; DOI:10.5169/seals-896987
• [44] «Schleierhaftes Am Winterhimmel» von Bruno Bleiker und Patrick Schellenbauer; astro*sapiens 1/95, S.12; DOI:10.5169/seals-896786
• [45] «Im Fadenkreuz: ζ Orionis, 52 Orionis, λ Orionis» von Markus Hägi; astro*sapiens 1/95, S.28; DOI:10.5169/seals-896790
• [46] «Grün, Blau Oder Grau?» von Philipp Heck; astro*sapiens 2/95, S.29; DOI:10.5169/seals-896803
• [47] «Im Fadenkreuz: NGC 5879, NGC 5866, NGC 5907, NGC 5908, NGC 5905» von Markus Hägi; astro*sapiens2/95, S.46; DOI:10.5169/seals-896806
• [48] «Im Fadenkreuz: M 15, NGC 7008, NGC 7479» von Philipp Heck; astro*sapiens 3/95, S.27; DOI:10.5169/seals-896813
• [49] «Im Fadenkreuz: M 1, NGC 1514, NGC 1931» von Markus Hägi; astro*sapiens 4/95, S.17; DOI:10.5169/seals-896823
• [50] «Von Samichläusen und Weihnachtsbäumen: Zwei Schmankerl am Winterhimmel» von Philipp Heck; astro*sapiens 4/95, S. 51; DOI:10.5169/seals-896830

Astronomical Journal (AJ)

• [148] «A Catalog of Parameters for Globular Clusters in the Milky Way» Harris, William E.; Astronomical Journal v.112, p.1487, October 1996 / Revision: December 2010; DOI:10.1086/118116; Bibcode:1996AJ....112.1487H; physwww.mcmaster.ca/~harris/mwgc.dat (2021-01-03)
• [201] «Looking into the Horsehead» Marc W. Pound1, Bo Reipurth, and John Bally; DOI:10.1086/368138; iopscience.iop.org/article/10.1086/368138 (2020-12-28)
• [255] «A study of reflection nebulae» van den Bergh, S.; Astronomical Journal, Vol. 71, p. 990-998 (1966); DOI:10.1086/109995; cdsarc.unistra.fr/viz-bin/cat/VII/21 (2021-01-30)
• [311] «A KINEMATIC AND PHOTOMETRIC STUDY OF THE GALACTIC YOUNG STAR CLUSTER NGC 7380» W. P. Chen, A. K. Pandey, Saurabh Sharma, C. W. Chen, Li Chen, J. Sperauskas, K. Ogura, R. J. Chuang, and R. P. Boyle; Published 2011 August 9; DOI:10.1088/0004-6256/142/3/71; iopscience.iop.org/article/10.1088/0004-6256/142/3/71 (2021-04-13)
• [341] «Optical identifications of AFCRL rocket infrared sources.» Cohen, M.; Astronomical Journal, Vol. 80, p. 125-127 (1975); February 1975; DOI:10.1086/111721; Bibcode:1975AJ.....80..125C; ui.adsabs.harvard.edu/abs/1975AJ.....80..125C/abstract (2021-05-12)
• [354] «LkHα 101 and the Young Cluster in NGC 1579» G. H. Herbig, Sean M. Andrews, and S. E. Dahm; The Astronomical Journal, Volume 128, Number 3; DOI:10.1086/423043; iopscience.iop.org/article/10.1086/423043 (2021-05-21)
• [357] «Spitzer Observations of IC 348: The Disk Population at 2-3 Million Years» Charles J. Lada, August A. Muench, K. L. Luhman, Lori Allen, Lee Hartmann, Tom Megeath, Philip Myers, Giovanni Fazio, Kenneth Wood, James Muzerolle; The Astronomical Journal, Volume 131, Number 3; DOI:10.1086/499808; iopscience.iop.org/article/10.1086/499808 (2021-05-21)
• [375] «REINVESTIGATING THE CLUSTERS KOPOSOV 1 AND 2» Nathaniel Paust, Danielle Wilson, and Gerard van Belle; Published 2014 June 10; The Astronomical Journal, Volume 148, Number 1; DOI:10.1088/0004-6256/148/1/19
• [376] «Physical Parameters of the Intermediate age Open Cluster IC 1311: Clues for the Theory of Stellar Evolution» Delgado, A. J.; Alfaro, E. J.; Aparicio, A.; Cabrera-Cano, J.; Astronomical Journal v.108, p.2193; December 1994; DOI:10.1086/117230
• [379] «Survey for Transiting Extrasolar Planets in Stellar Systems. IV. Variables in the Field of NGC 1245» Joshua Pepper1 and Christopher J. Burke1; Published 2006 July 27; The Astronomical Journal, Volume 132, Number 3; DOI:10.1086/505942
• [380] «Survey for Transiting Extrasolar Planets in Stellar Systems. I. Fundamental Parameters of the Open Cluster NGC 1245» Christopher J. Burke, B. Scott Gaudi, D. L. DePoy, Richard W. Pogge, and Marc H. Pinsonneault; The Astronomical Journal, Volume 127, Number 4, 2004;; DOI:10.1086/382720
• [385] «Star Counts in the Open Cluster NGC 2420» Leonard, Peter J. T.; Astronomical Journal v.95, p.108, January 1988; DOI:10.1086/114617
• [389] «Resolving the Circumstellar Environment of the Galactic B[e] Supergiant Star MWC 137 from Large to Small Scales» Michaela Kraus, Tiina Liimets, Cristina E. Cappa, Lydia S. Cidale, Dieter H. Nickeler, Nicolas U. Duronea, Maria L. Arias, Diah S. Gunawan, Mary E. Oksala, Marcelo Borges Fernandes, Grigoris Maravelias, Michel Curé, and Miguel Santander-García; Published 2017 October 20; The Astronomical Journal, Volume 154, Number 5; DOI:10.3847/1538-3881/aa8df6
• [394] «LOW-METALLICITY YOUNG CLUSTERS IN THE OUTER GALAXY. I. Sh 2-207» Chikako Yasui, Naoto Kobayashi, Alan T. Tokunaga, Masao Saito, and Natsuko Izumi; Published 2016 February 9; The Astronomical Journal, Volume 151, Number 3; DOI:10.3847/0004-6256/151/3/50
• [407] «Runaway Stars as Possible Sources of the Elliptical Ring Structures in NGC 7538» Josephine Fenske, Jason Arakawa, Cassandra Fallscheer, and James Di Francesco; The Astronomical Journal, Volume 161, Number 4, 2021; DOI:10.3847/1538-3881/abded2
• [424] «Open Cluster IC 1369 and Its Vicinity: Multicolor Photometry and Gaia DR2 Astrometry» V. Straižys, R. P. Boyle, S. Raudeliūnas, J. Zdanavičius, R. Janusz, M. Macijauskas, R. Lazauskaitė, K. Černis, K. Zdanavičius, M. Maskoliūnas, V. Čepas, and A. Kazlauskas; The Astronomical Journal, Volume 159, Number 3, 2020; DOI:10.3847/1538-3881/ab67b5
• [445] «The Sejong Open Cluster Survey (SOS). IV. The Young Open Clusters NGC 1624 and NGC 1931» Beomdu Lim, Hwankyung Sung, Michael S. Bessell, Jinyoung S. Kim, Hyeonoh Hur, and Byeong-Gon Park;The Astronomical Journal, Volume 149, Number 4, 215; DOI:10.1088/0004-6256/149/4/127
• [506] «The Interacting Galaxies NGC 5394/5395: A Post-Ocular Galaxy and Its Ring/Spiral Companion» Michele Kaufman, Elias Brinks, Bruce G. Elmegreen, Debra Meloy Elmegreen, Mario Klarić, Curtis Struck, Magnus Thomasson, and Stuart Vogel; The Astronomical Journal, Volume 118, Number 4, 1999; DOI:10.1086/301030
• [518] «Kinematic and Photometric Evidence for a Bar in NGC 2683» Rachel Kuzio de Naray, Matthew J. Zagursky, and Stacy S. McGaugh; The Astronomical Journal, Volume 138, Number 4, 2009; DOI:10.1088/0004-6256/138/4/1082
• [529] «A Spatiokinematic Study of the Planetary Nebula NGC 4361: Evidence for Quadrupolar Flows» C. Muthu and B. G. Anandarao; The Astronomical Journal, Volume 121, Number 4, 2001; DOI:10.1086/319939
• [539] «Physical Structure of Planetary Nebulae. III. The Large and Evolved NGC 1360» Goldman, Daniel B.; Guerrero, Martín A.; Chu, You-Hua; Gruendl, Robert A.; The Astronomical Journal, Volume 128, Issue 4, pp. 1711-1715, October 2004; arXiv:astro-ph/0407568; DOI:10.1086/424623; Bibcode:2004AJ....128.1711G
• [549] «The Highly Enriched Planetary Nebula BV-1» Kaler, James B.; Chu, You-Hu; Jacoby, George H.; Astronomical Journal v.96, p.1407, October 1988; DOI:10.1086/114890; Bibcode:1988AJ.....96.1407K
• [582] «H I Imaging Observations of Superthin Galaxies. II. IC 2233 and the Blue Compact Dwarf NGC 2537» Lynn D. Matthews and Juan M. Uson; The Astronomical Journal, Volume 135, Number 1, 2008; DOI:10.1088/0004-6256/135/1/291
• [598] «Supernovae and Supernova Remnants» Poveda, A. ; Woltjer, L.; Astronomical Journal, Vol. 73, p. 65 (1968); DOI:10.1086/110600; Bibcode:1968AJ.....73...65P
• [603] «Markarian 421'S Unusual Satellite Galaxy» Peter W. Gorham, Liese van Zee, Stephen C. Unwin, and Christopher Jacobs; The Astronomical Journal, Volume 119, Number 4,2000; DOI:10.1086/301289

Astronomische Nachrichten

• [554] «Nebulae which are not recorded in the Catalogues» Roberts, I.; Astronomische Nachrichten, volume 147, p.87, August 1898; DOI:10.1002/asna.18981470406; Bibcode:1898AN....147...87R
• [568] «Nébuleuses découvertes et observées à Marseille» Stephan, E.; Astronomische Nachrichten, volume 105, Issue 6, p.81, April 1883; DOI:10.1002/asna.18831050602; Bibcode:1883AN....105...81S
• [594] «Untersuchungen über Reflexionsnebel am Palomar Sky Survey I. Verzeichnis von Reflexionsnebeln» Dorschner, J. ; Gürtler, J.; Astronomische Nachrichten, volume 287, p.257; December 1963; DOI:10.1002/asna.19632870507; Bibcode:1963AN....287..257D

Astronomy

• [51] Eye On The Sky: Canes Venatici by Deborah Byrd; Astronomy 4/92, p.52
• [52] Eye On The Sky: Sagittarius by Deborah Byrd; Astronomy 7/92, p.52
• [53] Exploring The Wonders Of Scutum by Robert Garfinkle; Astronomy 7/92, p.67
• [54] Eye On The Sky: Cygnus by Deborah Byrd; Astronomy 8/92, p.48
• [55] Eye On The Sky: Delphinus, Equuleus by Deborah Byrd; Astronomy 10/92, p.48
• [56] Eye On The Sky: Orion by Deborah Byrd; Astronomy 1/93, p.52
• [57] Eye On The Sky: Cancer by Deborah Byrd; Astronomy 2/93, p.52
• [58] Eye On The Sky: Bootes by Deborah Byrd; Astronomy 4/93, p.48
• [59] Eye On The Sky: Libra by Deborah Byrd; Astronomy 5/93, p.48
• [60] Beautiful Bootes by Alister Ling; Astronomy 5/93, p.56
• [61] Eye On The Sky: Scorpius by Deborah Byrd; Astronomy 6/93, p.48
• [62] Eye On The Sky: Aquila by Deborah Byrd; Astronomy 7/93, p.48
• [63] Eye On The Sky: Aquarius by Deborah Byrd; Astronomy 8/93, p.56
• [64] Eye On The Sky: Piscis Austrinus by Deborah Byrd; Astronomy 9/93, p.48
• [65] The Starry Sky: Orion by Deborah Byrd; Astronomy 1/94, p.55
• [66] The Starry Sky: Perseus by Deborah Byrd; Astronomy 2/94, p.52
• [67] The Starry Sky: Leo by Deborah Byrd; Astronomy 3/94, p.51
• [68] The Starry Sky: Ursa Maior by Deborah Byrd; Astronomy 5/94, p.82
• [69] The Starry Sky: Lyra by Deborah Byrd; Astronomy 6/94, p.51
• [70] Tracking Down A Quasar by Phil Harrington; Astronomy 6/94, p.56
• [71] The Starry Sky: Cygnus by Deborah Byrd; Astronomy 7/94, p.52
• [72] Hunting Down The Cygnus Bubble; Astronomy 7/94, p.53
• [73] The Starry Sky: Aquila by Deborah Byrd; Astronomy 8/94, p.51
• [74] The Starry Sky: Cassiopeia by Deborah Byrd; Astronomy 9/94, p.63
• [75] Spot M33 With The Naked Eye; Astronomy 9/94, p.65
• [76] The Starry Sky: Aries by Deborah Byrd; Astronomy 10/94, p.50
• [77] The Starry Sky: Taurus by Deborah Byrd; Astronomy 12/94, p.60
• [78] The Starry Sky: Canis Minor by Deborah Byrd; Astronomy 2/95, p.63
• [79] The Starry Sky: Virgo by Deborah Byrd; Astronomy 4/95, p.62
• [80] The Starry Sky: Sagittarius by Deborah Byrd; Astronomy 7/95, p.60
• [81] The Starry Sky: Capricornus by Deborah Byrd; Astronomy 8/95, p.58
• [82] The Starry Sky: Cepheus by Deborah Byrd; Astronomy 9/95, p.63
• [83] The Starry Sky: Pisces by Deborah Byrd; Astronomy 10/95, p.62
• [84] The Starry Sky: Andromeda by Deborah Byrd; Astronomy 11/95, p.69
• [85] The Starry Sky: Auriga by Deborah Byrd; Astronomy 12/95, p.69
• [86] The Starry Sky: Gemini by Deborah Byrd; Astronomy 1/96, p.64
• [87] The Starry Sky: Canopus and Carina the Keel by Deborah Byrd; Astronomy 2/96, p.64
• [88] The Starry Sky: Canes Venatici by Deborah Byrd; Astronomy 3/96, p.62
• [89] The Starry Sky: Coma Berenices by Deborah Byrd; Astronomy 4/96, p.62
• [90] Hunt Down A Quasar; Astronomy 4/96, p.64
• [91] Plunge Into The Lagoon by David J. Eichner; Astronomy 7/96, p.82
• [92] Have Astronomers Solved The Quasar Enigma? by Ken Croswell; Astronomy 2/93, p.28

Astronomy & Astrophysics

• [131] «Far-infrared observations of a massive cluster forming in the Monoceros R2 filament hub» T. S. M. Rayner, M. J. Griffin, N. Schneider, F. Motte, V. Könyves, P. André, J. Di Francesco, P. Didelon, K. Pattle, D. Ward-Thompson, L. D. Anderson, M. Benedettini, J.-P. Bernard, S. Bontemps, D. Elia, A. Fuente, M. Hennemann, T. Hill, J. Kirk, K. Marsh, A. Men’shchikov, Q. Nguyen Luong, N. Peretto, S. Pezzuto, A. Rivera-Ingraham, A. Roy, K. Rygl, Á. Sánchez-Monge, L. Spinoglio, J. Tigé, S. P. Treviño-Morales and G. J. White; A&A Volume 607, November 2017; DOI:10.1051/0004-6361/201630039
• [144] «An extragalactic database. I. The catalogue of principal galaxies.» Paturel, G.; Fouque, P. search by orcid; Bottinelli, L.; Gouguenheim, L.; Astronomy and Astrophysics, Suppl. Ser., Vol. 80, p. 299-315 (1989); Bibcode:1989A&AS...80..299P; cdsarc.cds.unistra.fr/viz-bin/cat/VII/119#/article (2021-02-18)
• [146] «Version 2000 of the Catalogue of Galactic Planetary Nebulae» L. Kohoutek, A&A Volume 378, Number 3, November II 2001; DOI:10.1051/0004-6361:20011162; cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/378/843
• [159] «Planetary Nebulae distances in Gaia DR2» S. Kimeswenger and D. Barría; A&A Volume 616, August 2018; DOI:10.1051/0004-6361/201833647; cdsarc.u-strasbg.fr/ftp/J/A+A/616/L2 (2021-01-02)
• [228] «A revised catalogue of δ Sct stars» E. Rodríguez, M. J. López-González and P. López de Coca; Astron. Astrophys. Suppl. Ser. Volume 144, Number 3, June II 2000; DOI:10.1051/aas:2000221; aas.aanda.org/articles/aas/abs/2000/12/h2054/h2054.html (2021-01-17)
• [254] «The IC2118 association: new T Tauri stars in high-latitude molecular clouds» M. Kun, T. Prusti, S. Nikoli'c, L. E. B. Johansson, N. A. Walton; arXiv:astro-ph/0402353; DOI:10.1051/0004-6361:20034510; arxiv.org/abs/astro-ph/0402353 (2021-01-30)
• [257] «Astrophysical parameters of Galactic open clusters» N. V. Kharchenko, A. E. Piskunov, S. Röser, E. Schilbach and R.-D. Scholz; A&A Volume 438, Number 3, August II 2005; DOI:10.1051/0004-6361:20042523; cdsarc.unistra.fr/viz-bin/cat/J/A+A/438/1163 (2021-01-31)
• [282] «A Census of Variability in Globular Cluster M68 (NGC 4590)» N. Kains, A. Arellano Ferro, R. Figuera Jaimes, D. M. Bramich, J. Skottfelt, U. G. Jørgensen, Y. Tsapras, R. A. Street, P. Browne, M. Dominik, K. Horne, M. Hundertmark, S. Ipatov, C. Snodgrass, I. A. Steele, K.A. Alsubai, V. Bozza, S. Calchi Novati, S. Ciceri, G. D'Ago, P. Galianni, S.-H. Gu, K. Harpsøe, T.C. Hinse, D. Juncher, H. Korhonen, L. Mancini, A. Popovas, M. Rabus, S. Rahvar, J. Southworth, J. Surdej, C. Vilela, X.-B. Wang, O. Wertz; arXiv:1502.07345v1; DOI:10.1051/0004-6361/201424600; arxiv.org/abs/1502.07345 (2021-02-22)
• [293] «NGC 4254: a spiral galaxy entering the Virgo cluster»; B. Vollmer, W. Huchtmeier, W. van Driel; A&A Volume 439, Number 3, September I 2005; DOI:10.1051/0004-6361:20041350; aanda.org/articles/aa/abs/2005/33/aa1350-04/aa1350-04.html (2021-03-08)
• [298] «On the origin of the O and B-type stars with high velocities II Runaway stars and pulsars ejected from the nearby young stellar groups» R. Hoogerwerf, J.H.J. de Bruijne, P.T. de Zeeuw; arXiv:astro-ph/0010057; DOI:10.1051/0004-6361:20000014; arxiv.org/abs/astro-ph/0010057 (2021-03-25)
• [302] «The power of teaming up HST and Gaia: the first proper motion measurement of the distant cluster NGC 2419» D. Massari, L. Posti, A. Helmi, G. Fiorentino1 and E. Tolstoy; A&A Volume 598, February 2017; DOI:10.1051/0004-6361/201630174; aanda.org/articles/aa/full_html/2017/02/aa30174-16/aa30174-16.html (2021-04-07)
• [306] «Supermassive black holes in the Sbc spiral galaxies NGC 3310, NGC 4303 and NGC 4258» G. Pastorini, A. Marconi1 A. Capetti, D. J. Axon, A. Alonso-Herrero, J. Atkinson, D. Batcheldor, C. M. Carollo, J. Collett, L. Dressel, M. A. Hughes, D. Macchetto, W. Maciejewski, W. Sparks and R. van der Marel; A&A Volume 469, Number 2, July II 2007; DOI:10.1051/0004-6361:20066784; aanda.org/articles/aa/abs/2007/26/aa6784-06/aa6784-06.html (2021-04-08)
• [307] «Interstellar anatomy of the TeV gamma-ray peak in the IC443 supernova remnant» P. Dell’Ova1, A. Gusdorf, M. Gerin, D. Riquelme, R. Güsten, A. Noriega-Crespo, L. N. Tram, M. Houde, P. Guillard, A. Lehmann, P. Lesaffre, F. Louvet, A. Marcowith and M. Padovani; A&A Volume 644, December 2020; DOI:10.1051/0004-6361/202038339
• [319] «Star formation in the outer Galaxy: coronal properties of NGC 1893» M. Caramazza, G. Micela, L. Prisinzano, S. Sciortino, F. Damiani, F. Favata, J. R. Stauffer, A. Vallenari and S. J. Wolk; A&A Volume 539, March 2012; DOI:10.1051/0004-6361/201117256; aanda.org/articles/aa/full_html/2012/03/aa17256-11/aa17256-11.html (2021-04-22)
• [349] «NGC 7139 and its stellar neighbourhood» Weinberger, R.; Ziener, R.; Astronomy and Astrophysics, Vol. 191, p. 297-302 (1988); February 1988; Bibcode:1988A%26A...191..297W; ui.adsabs.harvard.edu/abs/1988A%26A...191..297W/abstract (2021-05-16)
• [359] «Discovery of a jet-like structure with overionized plasma in the SNR IC 443» Emanuele Greco, Marco Miceli, Salvatore Orlando, Giovanni Peres, Eleonora Troja and Fabrizio Bocchino; A&A Volume 615, July 2018; DOI:10.1051/0004-6361/201832733
• [361] «IRAM and Gaia views of multi-episodic star formation in IC 1396A — The origin and dynamics of the Class 0 protostar at the edge of an HII region» Aurora Sicilia-Aguilar, Nimesh Patel, Min Fang, Veronica Roccatagliata, Konstantin Getman and Paul Goldsmith; A&A Volume 622, February 2019; DOI:10.1051/0004-6361/201833207
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Astronomy Letters

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Astrophysics Data System (ADS)

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• [390] «New Planetary and Peculiar Gaseous Nebulae» Vorontsov-Vel'Yaminov, B. A.; Soviet Astronomy, Vol. 5, p.278, October 1961; Bibcode:1961SvA.....5..278V
• [402] Gaze-Shajn Emission Nebulae; clearskies.eu/astronomy/articles/gaze-shajn (2023-05-06)
• [404] «The nature of the nebulae A21 (YM 29) and Simeiz 22» Arkhipova, V. P. ; Lozinskaya, T. A.; Soviet Astronomy Letters, vol. 4, Jan.-Feb. 1978, p. 7-10; Bibcode:1978SvAL....4....7A
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• [461] «The Planetary Nebulae» Curtis, H. D.; Publications of Lick Observatory, vol. 13, pp.55-74, 1918; Bibcode:1918PLicO..13...55C; ui.adsabs.harvard.edu/abs/1918PLicO..13...55C (2022-01-01)
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• [570] «Catalogue of star clusters and associations» Alter, G. ; Ruprecht, J. ; Vanýsek, V.; Prague, Pub. House of the Czechoslavak Academy of Sciences, 1958.; Bibcode:1958csca.book.....A
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Boooks and Atlases

• [1] «Atlas der schönsten Himmelsobjekte» von Hans Vehrenberg; 4. Auflage von «Mein Messier-Buch», Nachdruck 1985; Treugesell-Verlag KG, Düsseldorf
• [2] «Signale von anderen Welten» von Prof. Frank Drake und Dava Sobel; Bechtermünz Verlag; ISBN 3-86047-769-2
• [3] «Bildatlas des Weltraums» von Antonin Rükl, Verlag Werner Dausien, ISBN 3-7684-2808-7
• [4] «Burnham's Celestial Handbook: An Observer's Guide to the Universe Beyond the Solar System» by Robert Burnham; Dover Publications, Inc.; Voume I: ISBN 0-486-23567-X; Volume II: ISBN 0-486-23568-8; Volume III: ISBN 0-486-23673-0
• [5] «Cambridge Star Atlas 2000.0» by Wil Tirion; Cambridge University Press; ISBN 0-521-26322-0
• [6] «Das neue Lexikon; Band 1-10»; Weltbild Verlag; © Bibliographisches Institut, Mannheim 1984
• [7] «Der grosse Kosmos-Himmelsführer» von Ian Ridpath und Wil Tirion; Kosmos Verlag; ISBN 3-440-05787-9
• [8] «Der Sternenhimmel: Begleiter zum Jahrbuch» von Ernst Hügli, Hans Roth und Karl Städeli; Salle + Sauerländer, ISBN 3-7941-2841-9 (Sauerländer), ISBN 3-7935-5024-9 (Salle)
• [9] «Drehbare Sternkarte SIRIUS» von H. Suter-Haug; Hallwag-Verlag, Bern
• [10] «dtv-Atlas zur Astronomie» von Joachim Herrmann; Deutscher Taschenbuch Verlag; ISBN 3-423-03006-2
• [12] «The Night Sky Observer's Guide, Volume I» George Robert Kepple, Glen W. Sanner, Willman-Bell, Inc., ISBN 0-943396-58-1
• [13] «The Night Sky Observer's Guide, Volume II» George Robert Kepple, Glen W. Sanner, Willman-Bell, Inc., ISBN 0-943396-60-3
• [15] «Hartung's Astronomical Objects for Southern Telescopes» by David Malin and David J. Frew; Melbourne University Press 1995; ISBN 0-522-84553-3
• [17] «Planetary Nebulae: A Practical Guide and Handbook for Amateur Astronomers» by Steven J. Hynes; 1991, Willmann-Bell, Inc., Richmond Virginia; ISBN 0-943396-30-1
• [18] «Sky Atlas 2000.0» by Wil Tirion; Cambridge University Press; ISBN 0-521-24467-6
• [20] «Sternbilder und ihre Mythen» von Gerhard Fasching; Zweite, verbesserte Auflage; Springer Verlag Wien, New York; ISBN 3-211-82552-5 (Wien); ISBN 0-387-82552-5 (New York)
• [21] «Taschenatlas der Sternbilder» von Josef Klepesta und Antonin Rükl; Verlag Werner Dausien; ISBN 3-7684-2384-0
• [22] «The Deep Sky Field Guide to Uranometria 2000.0» by Murray Cragin, James Lucik and Barry Rappaport; Willmann-Bell, Inc.; ISBN 0-943396-38-7
• [23] «Uranometria 2000.0, Volume I» by Wil Tirion, Barry Rappaport and George Lovi; Willmann-Bell, Inc.; ISBN 0-943396-14-X
• [24] «Uranometria 2000.0, Volume II» by Wil Tirion, Barry Rappaport and George Lovi; Willmann-Bell, Inc.; ISBN 0-943396-15-8
• [25] «Das Taschenbuch vom Sternenhimmel» von Peter von Eynern; Wilhelm Heyne Verlag, München, 1972
• [26] «Visual Astronomy of the Deep Sky» by Roger N. Clark; Cambridge University Press
• [27] «Der Komet» von Carl Sagan und Ann Druyan; Buchclub Ex Libris Zürich

Bulletin of the Astronomical Institute of Czechoslovakia

• [391] «Morphological study of planetary nebulae. I. Observed forms of planetary nebulae.» Kromov, G. S.; Kohoutek, L.; Bulletin of the Astronomical Institutes of Czechoslovakia, Vol. 19, p. 1-11 (1968); Bibcode:1968BAICz..19....1K; ui.adsabs.harvard.edu/abs/1968BAICz..19....1K (2021-06-13)
• [436] «New planetary nebulae» Kohoutek, L.; Bulletin of the Astronomical Institute of Czechoslovakia, vol. 14, p.70, 1963; Bibcode:1963BAICz..14...70K; ui.adsabs.harvard.edu/abs/1963BAICz..14...70K (2021-09-27)
• [542] «Classification of open star clusters» Ruprecht, J.; Bulletin of the Astronomical Institute of Czechoslovakia, vol. 17, p.33, 1966; Bibcode:1966BAICz..17...33R
• [545] «Hamburg Schmidt-camera survey of faint planetary nebulae» Kohoutek, L.; Bulletin of the Astronomical Institute of Czechoslovakia, vol. 16, p.221, 1965; Bibcode:1965BAICz..16..221K

Centre de Données astronomiques de Strasbourg (CDS)

• [16] Centre de Données astronomiques de Strasbourg; cds.u-strasbg.fr
• [141] Strasbourg-ESO Catalogue of Galactic Planetary Nebulae; A. Acker, F. Ochsenbein, B. Stenholm, R. Tylenda, J. Marcout, C. Schohn; European Southern Observatory; ISBN 3-923524-41-2 (1992); Bibcode:1992secg.book.....A; cdsarc.u-strasbg.fr/viz-bin/cat/V/84
• [142] NGC 2000.0, The Complete New General Catalogue and Index Catalogue of Nebulae and Star Clusters by J.L.E. Dreyer; edited by Roger W. Sinnott; Sky Publishing Corporation and Cambridge University Press (1988); cdsarc.unistra.fr/viz-bin/cat/VII/118 (2021-02-18)
• [143] Catalogue of Galactic Globular Clusters; R. Monella, 1985; Coelum LIII, 287; cdsarc.u-strasbg.fr/viz-bin/cat/VII/103
• [145] SIMBAD astronomical database; simbad.u-strasbg.fr/simbad
• [147] Aladin Lite; aladin.u-strasbg.fr/AladinLite
• [226] HYPERLEDA. I. Catalog of galaxies (Paturel+, 2003); cdsarc.unistra.fr/viz-bin/cat/VII/237 (2021-01-13)
• [459] «Uppsala General Catalogue of Galaxies (UGC)» Nilson 1973; cdsarc.cds.unistra.fr/viz-bin/cat/VII/26D (2021-12-23)

ETH Bibliothek Zürich

• [11] «Results of astronomical observations made during the years 1834, 5, 6, 7, 8, at the Cape of Good Hope ... : being the completion of a telescopic survey of the whole surface of the visible heavens, commenced in 1825» Herschel, John F. W.; London : published by Smith, Elder and Co., 1847; DOI:10.3931/e-rara-22242
• [14] «Coelum australe stelliferum» N. L. de Lacaille; Parisiis : sumptibus Hipp. Lud. Guerin et Lud. Fr. Delatour, 1763; DOI:10.3931/e-rara-529
• [19] «Prodromus Astronomiae» Johannes Hevelius, 1690; DOI:10.3931/e-rara-456
• [28] «Uranometria omnium asterismorum continens schemata, nova methodo delineata aereis laminis expressa» Johann Bayer, Augsburg, 1603; DOI:10.3931/e-rara-309

European Southern Observatory (ESO)

• [195] ESO Online Digitized Sky Survey; archive.eso.org/dss/dss (2020-12-27)
• [208] New ESO’s VLT image of the Skull Nebula; eso.org/public/images/eso2019a (2020-12-30)
• [221] NGC 2264 and the Christmas Tree cluster; eso.org/public/images/eso0848a (2021-01-08)
• [229] MUSE image of the Saturn Nebula; eso.org/public/images/eso1731a (2021-01-17)
• [236] Spiral galaxy NGC 1097; eso.org/public/images/eso0438d (2021-01-20)
• [275] Barnard's Galaxy; eso.org/public/images/eso0938a (2021-02-17)
• [279] VISTA infrared image of the globular star cluster Messier 55; eso.org/public/unitedkingdom/images/eso1220a (2021-02-19)
• [284] The edge-on galaxy NGC 1055; eso.org/public/unitedkingdom/images/eso1707a (2021-02-26)
• [292] Why so blue?; eso.org/public/images/potw1636a (2021-03-07)
• [412] Red and Long Dead; eso.org/public/images/potw1927a (2021-07-26)
• [511] Spiral galaxy NGC 253; eso.org/public/usa/images/eso0902c (2022-10-16)
• [520] VISTA-Infrarotaufnahme des Katzenpfotennebels; eso.org/public/germany/images/eso1017a (2022-06-07)
• [546] eso1317de-ch — Bildveröffentlichung Eine geisterhafte grüne Blase Schnappschuss eines Planetarischen Nebels vom VLT der ESO, 10. April 2013; eso.org/public/switzerland-de/news/eso1317 (2022-10-03)
• [553] Arp 271 — galaxies drawn together; eso.org/public/usa/images/potw1035a (2022-10-11)
• [556] eso1237 — Photo Release: The Rich Colours of a Cosmic Seagull; 26 September 2012; Richard Hook, ESO, La Silla, Paranal, E-ELT & Survey Telescopes Public Information Officer, Garching bei München, Germany; eso.org/public/usa/news/eso1237 (2022-10-12)
• [557] eso1306 — Photo Release: The Wings of the Seagull Nebula; 6 February 2013; Richard Hook, ESO, La Silla, Paranal, E-ELT & Survey Telescopes Press Officer, Garching bei München, Germany; eso.org/public/usa/news/eso1306 (2022-10-12)
• [558] eso1913 — Photo Release: «Anatomy of a Cosmic Seagull, ESO’s VST captures a celestial gull in flight» 7 August 2019; Mariya Lyubenova, ESO Head of Media Relations Team, Garching bei München, Germany; eso.org/public/usa/news/eso1913 (2022-10-12)
• [581] Starshine in Canis Major; eso.org/public/images/potw1911a (2023-01-19)
• [591] NGC 2467 and surroundings; eso.org/public/images/eso0544a (2023-02-11)
• [608] Stellar Nursery Blooms into View; eso.org/public/images/eso1740a (2023-05-05)

European Space Agency (ESA)

• [182] The Inky Abyss; esahubble.org/images/potw1932a (2020-12-22)
• [184] Iridescent Glory of Nearby Planetary Nebula Showcased on Astronomy Day; esahubble.org/images/heic0307a (2020-12-23)
• [185] Hubble image of M101; esahubble.org/images/opo0907h (2020-12-23)
• [186] Seeing double; esahubble.org/images/potw1403a (2020-12-23)
• [187] Hubble's planetary nebula gallery. A view of NGC 6826; esahubble.org/images/opo9738d (2020-12-24)
• [188] Out of this whirl: The Whirlpool Galaxy (M51) and companion galaxy; esahubble.org/images/heic0506a (2020-12-24)
• [189] Messier 61 looks straight into the camera; esahubble.org/images/potw1324a (2020-12-24)
• [191] A hungry starburst galaxy; esahubble.org/images/potw1417a (2020-12-24)
• [198] The belly of the cosmic whale; esahubble.org/images/potw1146a (2020-12-28)
• [205] Twins with differences; esahubble.org/images/potw1805a (2020-12-30)
• [213] Quasar 3C 273; esahubble.org/images/opo0303c (2020-12-31)
• [214] Most detailed image of the Crab Nebula; esahubble.org/images/heic0515a (2020-12-31)
• [216] Old stars with a youthful glow; esahubble.org/images/potw1107a (2020-12-31)
• [220] Hubble's variable nebula (NGC 2261); esahubble.org/images/opo9935c (2021-01-08)
• [222] The largest of its kind; esahubble.org/images/potw1913a (2021-01-10)
• [223] Blue rejuvenation; esahubble.org/images/potw1914a (2021-01-10)
• [224] Hubble views a cosmic oyster and pearl in NGC 1501; esa.int/ESA_Multimedia/Images/2016/09/Hubble_views_a_cosmic_oyster_and_pearl_in_NGC_1501 (2021-01-10)
• [234] NGC 7009 illustration; esahubble.org/images/opo9738m (2021-01-19)
• [241] The crammed centre of Messier 22; esahubble.org/images/potw1514a (2021-01-22)
• [245] Bucking the trend; esahubble.org/images/potw1921a (2021-01-22)
• [249] Ancient orbs; esahubble.org/images/potw1236a (2021-01-24)
• [250] Breathing new life into an old cluster; esahubble.org/images/potw1118a (2021-01-24)
• [259] A galactic sunflower; esahubble.org/images/potw1536a (2021-02-06)
• [262] Vampires and collisions rejuvenate stars; esahubble.org/news/heic0918 (2021-02-08)
• [273] Invisible X-rays; esahubble.org/images/potw1911a (2021-02-15)
• [280] A collection of ancient stars; esahubble.org/images/potw1234a (2021-02-19)
• [290] Spotlight on IC 3583; esahubble.org/images/potw1648a (2021-03-02)
• [300] HERSCHEL IMAGE OF IC 5146; sci.esa.int/web/herschel/-/48624-herschel-image-of-ic-5146 (2021-03-31)
• [301] The two mysterious populations of NGC 2419; esahubble.org/images/potw1908a (2021-04-06)
• [323] A remote outpost of the Milky Way; esahubble.org/images/potw1137a (2021-05-02)
• [343] Hubble images searchlight beams from a preplanetary nebula; esahubble.org/images/potw1217a (2021-05-12)
• [350] Smoky shells; esahubble.org/images/potw1250a (2021-05-16)
• [353] NGC 1579: The Trifid of the North; esahubble.org/images/potw1322a (2021-05-21)
• [368] Family of stars breaking up; esahubble.org/images/potw1111a (2021-05-30)
• [373] A unique cluster: one of the hidden 15; esa.int/ESA_Multimedia/Images/2013/04/A_unique_cluster_one_of_the_hidden_15 (2021-05-31)
• [406] A curious ring in star factory NGC 7538; sci.esa.int/s/WLGZKbw (2021-07-07)
• [409] A young star takes centre stage; esahubble.org/images/potw1509a (2021-07-10)
• [415] Abell 30: a born-again planetary nebula; esa.int/ESA_Multimedia/Images/2012/11/Abell_30_a_born-again_planetary_nebula (2021-07-30)
• [427] Hubble’s Hidden Galaxy; esahubble.org/images/potw1727a (2021-08-29)
• [435] Spiral, elliptical, irregular; esahubble.org/images/potw1924a (2021-09-26)
• [440] Spiral spins both ways; esahubble.org/images/potw1125a (2021-10-03)
• [456] Hubble reveals NGC 2440; esahubble.org/images/heic0703a (2021-12-20)
• [496] Rare cosmic footprint; esahubble.org/images/potw1128a (2022-02-22)
• [516] Hubble Looks at a ‘Space Triangle’ Spawned by a Galaxy Collision; esahubble.org/news/heic2201 (2022-04-29)
• [517] Hubble spies a UFO; esahubble.org/images/potw1213a (2022-05-01)
• [521] NGC 6302; esahubble.org/images/heic2011b (2022-06-09)
• [534] A dazzling planetary nebula; esahubble.org/images/potw1034a (2022-09-20)
• [536] Little gem; esahubble.org/images/potw1531a (2022-09-22)
• [540] The Spirograph Nebula; esahubble.org/images/opo0028a (2022-09-30)
• [563] Young star rebels against its parent cloud; esa.int/Science_Exploration/Space_Science/Young_star_rebels_against_its_parent_cloud (2021-04-11)
• [565] heic2205 — Photo Release: Celebrating Hubble’s 32nd Birthday with a Galaxy Grouping; esahubble.org/news/heic2205 (2022-11-06)
• [566] Hubble views a bizarre cosmic quartet [HEIC1514]; sci.esa.int/web/hubble/-/56054-hubble-views-a-bizarre-cosmic-quartet-heic1514 (2022-11-07)
• [578] heic0109 — Photo Release: Surfing in Sagittarius - not for the faint-hearted!; esahubble.org/news/heic0109 (2023-01-16)
• [585] A Distant backwater of the Milky Way; esahubble.org/images/potw1023a (2023-01-28)
• [587] Globular cluster NGC 4147; esahubble.org/images/heic1905c (2023-02-04)
• [589] IC 4593; esahubble.org/images/opo0733d (2023-02-04)

International Astronomical Union (IAU)

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Interstellarum

• [93] Objekte der Saison: Cr 399 von Jürgen Lamprecht; Interstellarum3/95, S.48
• [94] Objekte der Saison: PK 205+14.1 von Ronald C. Stoyan; Interstellarum1/96, S.54
• [95] Objekte der Saison: 3C 273 von Klaus Veit; Interstellarum2/96, S.50
• [96] Objekte der Saison: NGC 4169/73/74/75 von Klaus Veit; Interstellarum2/96, S.52
• [97] Objekte für lange Brennweiten: Die Galaxie M63 von Peter Riepe und Stefan Binnewies; Interstellarum2/96, S.60
• [98] Objekte der Saison: M92 von Jürgen Lamprecht; Interstellarum3/95, S.53

Memoirs of the Royal Astronomical Society

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Monthly Notices of the Royal Astronomical Society (MNRAS)

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• [446] «NGC 474 as viewed with KCWI: diagnosing a shell galaxy» Adebusola B Alabi, Anna Ferré-Mateu, Duncan A Forbes, Aaron J Romanowsky, Jean P Brodie; Monthly Notices of the Royal Astronomical Society, Volume 497, Issue 1, September 2020, Pages 626–631; DOI:10.1093/mnras/staa1992
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• [458] «Galaxy groups and clouds in the local (z∼ 0.01) Universe» Dmitry Makarov, Igor Karachentsev; Monthly Notices of the Royal Astronomical Society, Volume 412, Issue 4, April 2011, Pages 2498–2520; DOI:10.1111/j.1365-2966.2010.18071.x
• [475] «New Herbig–Haro objects and outflows in the Mon R1 association» T A Movsessian, T Yu Magakian, S N Dodonov; Monthly Notices of the Royal Astronomical Society, Volume 500, Issue 2, January 2021, Pages 2440–2450; DOI:10.1093/mnras/staa3302
• [489] «Optical and infrared imaging and spectroscopy of the multiple-shell planetary nebula NGC 6369» G. Ramos-Larios, M. A. Guerrero, R. Vázquez, J. P. Phillips; Monthly Notices of the Royal Astronomical Society, Volume 420, Issue 3, March 2012, Pages 1977–1989; DOI:10.1111/j.1365-2966.2011.20075.x
• [505] «Hu 1-2: a metal-poor bipolar planetary nebula with fast collimated outflows» X. Fang, M. A. Guerrero, L. F. Miranda, A. Riera, P. F. Velázquez, A. C. Raga; Monthly Notices of the Royal Astronomical Society, Volume 452, Issue 3, 21 September 2015, Pages 2445–2462; DOI:10.1093/mnras/stv1477
• [524] «Gas motions in the plane of the spiral galaxy NGC 3631» A. M. Fridman, O. V. Khoruzhii, E. V. Polyachenko, A. V. Zasov, O. K. Sil'Chenko, A. V. Moiseev, A. N. Burlak, V. L. Afanasiev, S. N. Dodonov, J. H. Knapen; Monthly Notices of the Royal Astronomical Society, Volume 323, Issue 3, May 2001, Pages 651–662; DOI:10.1046/j.1365-8711.2001.04218.x
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NASA/IPAC Extragalactic Database (NED)

• [194] NASA/IPAC Extragalactic Database (NED); ned.ipac.caltech.edu (2020-12-27)
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National Aeronautics and Space Administration (NASA)

• [151] Hubble's sharpest view of the Orion Nebula; hubblesite.org/contents/media/images/2006/01/1826-Image.html (2021-01-03)
• [170] Crab Nebula -- The Movie; Press Release No. STScI-PRC96-22; hubblesite.org/contents/news-releases/1996/news-1996-22.html
• [178] Happy Sweet Sixteen, Hubble Telescope! – Starburst Galaxy M82; hubblesite.org/contents/media/images/2006/14/1876-Image.html (2020-12-21)
• [179] Hubble/Galex/Spitzer Composite Image Of M81; hubblesite.org/contents/media/images/2007/19/2130-Image.html (2020-12-21)
• [180] Hubble Photographs Grand Design Spiral Galaxy M81; hubblesite.org/contents/media/images/2007/19/2127-Image.html (2020-12-21)
• [181] Dust Band Around The Nucleus Of «Black Eye Galaxy» M64; hubblesite.org/contents/media/images/2004/04/1447-Image.html (2020-12-21)
• [183] The Majestic Sombrero Galaxy (M104); hubblesite.org/contents/media/images/2003/28/1415-Image.html (2020-12-23)
• [190] Hubbles Messier Catalog: Messier 61; nasa.gov/feature/goddard/2017/messier-61 (2020-12-24)
• [200] New infrared view of the Horsehead Nebula — Hubble’s 23rd anniversary image; esahubble.org/images/heic1307a (2020-12-28)
• [203] The Tadpole Galaxy: Distorted Victim of Cosmic Collision; hubblesite.org/contents/media/images/2002/11/1181-Image.html (2020-12-29)
• [210] NGC 5466 Visualization; hubblesite.org/video/1200/news
• [211] Dusty Helix Nebula; spitzer.caltech.edu/images/1746-ssc2007-03a1-Dusty-Helix-Nebula (2020-12-30)
• [215] Explore - The Night Sky | Hubble’s Messier Catalog; nasa.gov/content/goddard/hubble-s-messier-catalog (2020-12-31)
• [225] NGC 2392; hubblesite.org/contents/media/images/2000/07/940-Image.html (2021-01-10)
• [230] Black Hole-Powered Jet Of Electrons And Sub-Atomic Particles Streams From Center Of Galaxy M87; hubblesite.org/contents/media/images/2000/20/968-Image.html (2021-01-17)
• [231] Full ACS image of NGC 5866; hubblesite.org/contents/media/images/2006/24/1933-Image.html (2021-01-17)
• [240] Messier 28; nasa.gov/feature/goddard/2017/messier-28 (2021-01-22)
• [242] HINT OF PLANET-SIZED DRIFTERS BEWILDERS HUBBLE SCIENTISTS; hubblesite.org/contents/news-releases/2001/news-2001-20.html (2021-01-22)
• [243] Messier 60; nasa.gov/feature/goddard/2017/messier-60 (2021-01-22)
• [244] ODD GALAXY COUPLE ON SPACE VOYAGE; September 06, 2012 9:00AM (EDT); Release ID: 2012-38; hubblesite.org/contents/news-releases/2012/news-2012-38.html (2021-01-22)
• [246] Messier 59; nasa.gov/feature/goddard/2018/messier-59 (2021-01-22)
• [247] THE CAT'S EYE NEBULA: DYING STAR CREATES FANTASY-LIKE SCULPTURE OF GAS AND DUST; hubblesite.org/contents/media/images/2004/27/1578-Image.html (2021-01-24)
• [253] Witch Head Nebula; nasa.gov/multimedia/imagegallery/image_feature_1209.html (2021-01-30)
• [261] Explore - The Night Sky | Hubble’s Caldwell Catalog; nasa.gov/content/goddard/hubble-s-caldwell-catalog (2021-02-08)
• [272] Behind the gas and dust of Orion's trapezium cluster; hubblesite.org/contents/media/images/2000/19/967-Image.html (2021-02-14)
• [276] Hubble X: A glowing gas cloud in the star-forming region of galaxy NGC 6822; hubblesite.org/contents/media/images/2001/01/1012-Image.html (2021-02-17)
• [294] Spiral Galaxy Pair NGC 4302 and NGC 4298; hubblesite.org/image/4019/gallery (2021-03-10)
• [308] Hubble Serves Up a Holiday Snow Angel; nasa.gov/mission_pages/hubble/science/snow-angel.html (2021-04-11)
• [334] Hubble Captures Re-energized Planetary Nebula; nasa.gov/image-feature/goddard/2021/hubble-captures-re-energized-planetary-nebula (2021-05-10)
• [346] Hubble Sees a Celestial Swan and Butterfly; nasa.gov/mission_pages/hubble/science/ngc7026.html (2021-05-14)
• [347] PLANETARY NEBULA NGC 7027: A SUN-LIKE STAR BURNING OUT; hubblesite.org/contents/media/images/1998/11/626-Image.html (2021-05-15)
• [348] NGC 7027: Like a Metallic Jewel Bug in the Sky; nasa.gov/image-feature/ngc-7027-like-a-metallic-jewel-bug-in-the-sky (2021-05-15)
• [351] NGC 1333 in the Infrared; spitzer.caltech.edu/image/ssc2005-24a1-ngc-1333-in-the-infrared (2021-05-20)
• [352] IC 59 and IC 63 in Cassiopeia; science.nasa.gov/ic-59-and-ic-63-cassiopeia (2021-05-18)
• [418] Hubble Sees Stars That Go Out With a Whimper; nasa.gov/content/hubble-sees-stars-that-go-out-with-a-whimper (2021-08-03)
• [421] Galactic Wreckage in Stephan's Quintet; nasa.gov/mission_pages/hubble/multimedia/ero/ero_stephan_quintet.html (2021-08-19)
• [431] Hubble Sees Spiral in Andromeda; nasa.gov/image-feature/goddard/2017/hubble-sees-spiral-in-andromeda (2021-09-19)
• [460] Young Stars in Their Baby Blanket of Dust; nasa.gov/mission_pages/spitzer/multimedia/20080211.html (2021-12-30)
• [469] APM 08279+5255: Matter Near Black Hole Gets Second Lease On Life; chandra.harvard.edu/photo/2003/apm08279 (2022-01-18)
• [476] The Mice (NGC 4676): Colliding Galaxies with Tails of Stars and Gas; hubblesite.org/contents/media/images/2002/11/1191-Image.html (2022-01-29)
• [477] Hubble Spies Eye in the Sky; nasa.gov/image-feature/goddard/2021/hubble-spies-eye-in-the-sky (2022-01-31)
• [479] The Glowing Eye of Planetary Nebula NGC 6751; hubblesite.org/contents/media/images/2000/12/956-Image.html (2022-02-02)
• [482] A Turtle-Shaped Nebula, NGC 6210, and the Structure around its Star; hubblesite.org/contents/media/images/1998/36/720-Image.html (2022-02-03)
• [483] NGC 6369: The Little Ghost Nebula - Astronomy Picture of the Day, 2017 October 28; apod.nasa.gov/apod/ap171028.html (2022-02-04)
• [493] Hubble Sees the Wings of a Butterfly: The Twin Jet Nebula; nasa.gov/feature/goddard/hubble-sees-the-wings-of-a-butterfly-the-twin-jet-nebula (2022-02-20)
• [522] NGC 6302; nasa.gov/mission_pages/hubble/multimedia/ero/ero_ngc6302.html (2022-06-09)
• [525] Hubble Looks at a Face-On Grand Spiral; nasa.gov/image-feature/goddard/2022/hubble-looks-at-a-face-on-grand-spiral (2022-07-10)
• [530] Planetary Nebula NGC 4361; spitzer.caltech.edu/image/ssc2009-15a3-planetary-nebula-ngc-4361 (2022-07-21)
• [531] A "Rose" made of Galaxies highlights Hubble's 21st Anniversary; hubblesite.org/contents/media/images/2011/11/2836-Image.html?news=true (2022-07-24)
• [533] Hubble Captures a Galactic Dance; nasa.gov/image-feature/goddard/2022/hubble-captures-a-galactic-dance (2022-09-16)
• [535] Planetary Nebula NGC 6818; hubblesite.org/contents/media/images/1998/11/622-Image.html (2022-09-21)
• [537] Round Planetary Nebula IC 3568; hubblesite.org/contents/media/images/1997/38/568-Image.html (2022-09-24)
• [567] Seyfert's Sextet: Four Colliding Galaxies, and two Bystanders; hubblesite.org/contents/media/images/2002/22/1242-Image.html (2022-11-12)
• [584] Starburst Galaxy NGC 1569; hubblesite.org/contents/media/images/2008/38/2424-Image.html (2023-01-21)

National Science Foundation (NSF)

• [157] Monoceros R2 Molecular Cloud; noirlab.edu/public/images/noao-mon_r2 (2023-05-01)
• [158] NOAO Image Gallery; noao.edu/image_gallery
• [197] NOIRLab: Hockey Stick Galaxy NGC 4656; noirlab.edu/public/images/noao-ngc4656 (2020-12-28)
• [209] NOAO Planetary Nebula Sampler; noao.edu/jacoby/index.html (2021-05-10)
• [232] NOIRLab: M97, NGC 3587; noirlab.edu/public/images/noao-m97 (2021-01-19)
• [233] NOIRLab: M108, NGC 3556; noirlab.edu/public/images/noao-m108
• [256] Ghost Nebula, vdB 141; noirlab.edu/public/images/noao-vdb141 (2021-01-30)
• [283] M76, NGC 650/651; noirlab.edu/public/images/noao-m76-kpno-0-9-meter (2021-02-25)
• [286] Big Galaxy Collisions Can Stunt Star Formation; noirlab.edu/public/news/noao0808 (2021-03-01)
• [291] M91, NGC 4548; noirlab.edu/public/images/noao-m91 (2021-03-03)
• [295] M99; NGC 4254; noirlab.edu/public/images/noao-m99 (2021-03-10)
• [297] Planetary nebula NGC 40; noirlab.edu/public/images/noao-ngc40w (2021-03-21)
• [317] T Tauri in NGC 1555; noirlab.edu/public/images/noao-ttau (2021-04-14)
• [328] Jones 1, PK 104-29.1; noirlab.edu/public/images/noao-jones1 (2021-05-05)
• [377] Open Cluster IC 1311; noirlab.edu/public/images/noao-ic1311 (2021-06-03)
• [457] Trio of Galaxies (NGC 5981, NGC 5982 and NGC 5985); noirlab.edu/public/images/noao-ngc5982 (2021-12-22)
• [481] NGC 6751 Glowing Eye Nebula; gemini.edu/gallery/media/ngc-6751-glowing-eye-nebula (2022-02-02)
• [492] Warped Disk of Galaxy UGC 3697; public.nrao.edu/gallery/warped-disk-of-galaxy-ugc-3697-2 (2022-02-09)
• [507] noirlab1912 — Photo Release: A Galactic Dance; noirlab.edu/public/news/noirlab1912 (2022-03-29)
• [596] Planetary Nebula Abell 74; noirlab.edu/public/images/noao-abell74 (2023-02-15)
• [600] M19, NGC 6273; noirlab.edu/public/images/noao-m19 (2023-03-11)

Publications of the Astronomical Society of the Pacific (PASP)

• [264] «Updated Information on the Local Group» Sidney van den Bergh (DAO/HIA/NRC); arXiv:astro-ph/0001040; DOI:10.1086/316548; arxiv.org/abs/astro-ph/0001040 (2021-02-09)
• [331] «Globular Clusters and Planetary Nebulae Discovered on the National Geographic Society-Palomar Observatory Sky Survey» Abell, G. O.; Publications of the Astronomical Society of the Pacific, Vol. 67, No. 397, p.258-261, August 1955; DOI:10.1086/126815; Bibcode:1955PASP...67..258A; ui.adsabs.harvard.edu/abs/1955PASP...67..258A/abstract (2021-05-10)
• [397] «New Emission Nebulae» R. Minkowski; Publications of the Astronomical Society of the Pacific, Volume 58, Number 344, 1946; DOI:10.1086/125855
• [416] «Twelve New Planetary Nebulae» Edwin Hubble;Publications of the Astronomical Society of the Pacific, Volume 33, Number 193, 1921; DOI:10.1086/123070
• [448] «New Results for the Open Cluster Bica 6 and Its Associated Planetary Nebula Abell 8» D. G. Turner, J. M. Rosvick, D. D. Balam, A. A. Henden, D. J. Majaess, and D. J. Lane; Publications of the Astronomical Society of the Pacific, Volume 123, Number 909; DOI:10.1086/662663
• [452] «A New Planetary Nebula» W. Baade; Publications of the Astronomical Society of the Pacific, Volume 47, Number 276, 1935; DOI:10.1086/124563
• [454] «NEW EMISSION NEBULAE (II)» R. Minkowski; Publications of the Astronomical Society of the Pacific, Volume 59, Number 350; 1947; DOI:10.1086/125962
• [504] «Two New Planetary Nebulae» M. L. Humason; Publications of the Astronomical Society of the Pacific, Volume 33, Number 193, 1921; DOI:10.1086/123071
• [526] «Two Small Planetary Nebulae» Paul W. Merrill; Publications of the Astronomical Society of the Pacific, Volume 54, Number 318, 1942; DOI:10.1086/125472
• [544] «Three New Planetary Nebulae» Heber D. Curtis; Publications of the Astronomical Society of the Pacific, Volume 31, Number 183, 1919; DOI:10.1086/122883; Bibcode:1919PASP...31..285C
• [548] «Extragalactic Nebulae Close to the Galactic Plane» Erika Böhm-Vitense; Publications of the Astronomical Society of the Pacific, Volume 68, Number 404, 1956; DOI:10.1086/126966
• [559] »The Moderately Young Open Cluster NGC 2353» M. Pim Fitzgerald, Gretchen L. Harris, and B. Cameron Reed; Publications of the Astronomical Society of the Pacific, Volume 102, Number 654, 1990; DOI:10.1086/132711
• [569] «A Dense Group of Galaxies in Serpens» Carl K. Seyfert; Publications of the Astronomical Society of the Pacific, Volume 63, Number 371, 1951; DOI:10.1086/126319
• [597] «A Survey of Galactic Radiation at 960 Mc/s» R. W. Wilson and J. G. Bolton; Publications of the Astronomical Society of the Pacific, Volume 72, Number 428, 1960; DOI:10.1086/127538

Revista Mexicana de Astronomía y Astrofísica

• [450] «The Structure of the Planetary Nebula IC 2149: A Jet or an Edge-On Ring?» Vázquez, R.; Miranda, L. F.; Olguín, L.; Benítez, G.; López, J. A.; Rodríguez, L. F.; Torrelles, J. M.; Ionized Gaseous Nebulae, a Conference to Celebrate the 60th Birthdays of Silvia Torres-Peimbert and Manuel Peimbert, Mexico City, November 21-24, 2000 (Eds. W. J. Henney, J. Franco, M. Martos, & M. Peña) Revista Mexicana de Astronomía y Astrofísica (Serie de Conferencias) Vol. 12, pp. 179-179 (2002); Bibcode:2002RMxAC..12..179V; ui.adsabs.harvard.edu/abs/2002RMxAC..12..179V/abstract
• [509] «Discovery of New Faint Northern Galactic Planetary Nebulae» Acker, A.; Boffin, H. M. J.; Outters, N.; Miszalski, B.; Sabin, L.; Le Dû, P.; Alves, F.; Revista Mexicana de Astronomía y Astrofísica Vol. 48, pp. 223-233 (2012); arXiv:1206.2477; Bibcode:2012RMxAA..48..223A
• [574] «Asterisms identification using astrometric data» Orellana, R. B. ; de Biasi, M. S.; IV Reunión sobre Astronomía Dinámica en Latino América (Eds. C. Allen, A. Ruelas, & R. Teixeira) Revista Mexicana de Astronomía y Astrofísica (Serie de Conferencias) Vol. 34, pp. 111-114 (2008); Bibcode:2008RMxAC..34..111O

Sky & Telescope

• [99] Observer's Notebook: Twin Quasar Continues to Attract Observers; S&T 3/93, p.119
• [100] The First Globular Cluster of the Season by Walter Scott Hudson; S&T 5/93, p.108
• [102] The Man with the Snake by George Lovi; S&T 6/93, p.63
• [103] Rediscovering the Color of the Crab Nebula by David Malin and Jay M. Pasachoff; S&T 7/93, p.43
• [104] Summer's Grandest Globular Cluster by Walter Scott Houston; S&T 7/93, p.110
• [105] A Star-Hop from Andromeda by Alan M. MacRobert; S&T 12/93, p.45
• [106] Resolving a Quasar's Jet; S&T 3/94, p.12
• [107] Rabbit Tracks by E. C. Krupp; S&T 6/94, p.64
• [108] Ring Nebula Reality; S&T 7/94, p.15
• [109] A Cepheus Star-Hop by Alan M. MacRobert; S&T 9/94, p.40
• [110] The Veil Nebula by Roger N. Clark; S&T 10/94, p.104
• [111] A Catalog of Quasars Near and Far by Geoffrey Burbidge and Adelaide Hewitt; S&T 12/94, p.32
• [112] Images: NGC 4038/39 by David Malin; S&T 12/94, p.42
• [113] Anatomy of a Crab by Wayne J. Parker; S&T 1/95, p.38
• [114] Anatomy of a Cat's Eye; S&T 4/95, p.12
• [115] Hubble Telescope Probes Shocks in Cygnus; S&T 5/95, p.11
• [116] Young Star Clusters Found by HST in the 'Antennae'; S&T 6/95, p.12
• [117] Andromeda's Brightest Globular Cluster by Leos Ondra; S&T 11/95, p.68
• [118] X-raying the Crab; S&T 2/96, p.15
• [119] Hubble Highlights the Helix Nebula's Knots; S&T 6/96, p.13
• [120] Fingering the Crab; S&T 6/96, p.16
• [121] Ripples in the Crab Nebula; S&T 8/96, p.10
• [122] Our Neighbor's Brightest Globular; S&T 8/96, p.15
• [123] M33's Puzzling Globulars; S&T 10/96, p.14
• [207] Editor's choice: Abell 79 by Hal Heaton, June 12, 2018; skyandtelescope.org/online-gallery/abell-79 (2021-05-11)
• [501] «Gauging Light Pollution: The Bortle Dark-Sky Scale» by John E. Bortle, Sky & Telescope, February 2001; skyandtelescope.org/astronomy-resources/light-pollution-and-astronomy-the-bortle-dark-sky-scale (2022-02-27)

Software

• [128] The Earth Centered Universe (ECU) von David J. Lane; Nova Astronomics; fox.nstn.ca/~ecu/edu.html
• [129] TheSky for Windows, Version 2.11, Level IV; Software Bisque; 912 Twelfth Street; Suite A; Golden, Colorado 80401, USA; bisque.com/thesky
• [149] SkySafari 6 Pro, Simulation Curriculum; skysafariastronomy.com
• [227] CDS Aladin Desktop; aladin.u-strasbg.fr/aladin.gml
• [265] PP3 - Celestial Chart Generation, Torsten Bronger; pp3.sourceforge.net (2021-02-11)

Space Telescope Science Institute (STScI)

• [160] The STScI Digitized Sky Survey; archive.stsci.edu/cgi-bin/dss_form
• [161] Hubble Spies Globular Cluster in Neighbouring Galaxy; Press Release No. STScI-PRC96-11; oposite.stsci.edu/pubinfo/pr/96/11/A.html
• [162] Planetary Nebula NGC 6543; Press Release No. STScI-PRC95-01; oposite.stsci.edu/pubinfo/pr/95/01.html
• [168] Hubble peers into the Heart of the densest known Star Cluster; Press Release No. STScI-PRD95-06; oposite.stsci.edu/pubinfo/pr/95/06.html
• [169] Cygnus Loop; Press Release No. STScI-PRC95-11; oposite.stsci.edu/pubinfo/pr/95/11.html
• [171] Giant 'Twisters' and Star Wisps in the Lagoon Nebula; Press Release No. STScI-PR96-38; oposite.stsci.edu/pubinfo/pr/96/38.html
• [172] Giant Starbirth Region In Neighboring Galaxy; Press Release No. STScI-PR96-27; oposite.stsci.edu/pubinfo/pr/96/27.html
• [173] Gallery of Planetary Nebula Images; oposite.stsci.edu/pubinfo/pr/97/pn
• [174] Embryonic Stars Emerge from Interstellar 'EGGs'; Press Release No. STScI-PR95-44; oposite.stsci.edu/pubinfo/pr/95/44.html
• [175] Hubble Space Telescope Finds Stellar Graveyard; Press Release No. STScI-PR95-32; oposite.stsci.edu/pubinfo/pr/95/32.html
• [176] Looking Down a Barrel of Gas at a Doomed Star; Press Release No. STScI-PR99-01; oposite.stsci.edu/pubinfo/pr/1999/01
• [177] Hubble Legacy Archive; hla.stsci.edu (2021-01-02)

Sterne und Weltraum

• [124] Quasar 3C 273 im Achtzöller von Michael Grosse; SuW 4/88, S.246
• [125] Aktuelle Hinweise für den Beobachter; SuW 8-9/94, S.635
• [126] Deep-Sky-Objekte des Monats: visuell beobachtet: NGC 6888 von Ronald C. Stoyan; SuW 7/96, S.555
• [127] Bewegung im Krebsnebel; SuW 8-9/96, S.611

Students for the Exploration and Development of Space (SEDS)

• [132] SEDS: The Interactive NGC Catalog Online; spider.seds.org/ngc/ngc.html
• [217] The Messier Catalog (SEDS); messier.seds.org (2021-01-01)
• [269] William Herschel's catalog of Deep Sky objects; messier.seds.org/xtra/similar/herschel.html (2021-12-27)

The Royal Society Publishing

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• [464] «Catalogue of a second thousand of new nebulae and clusters of stars; with a few introductory remarks on the construction of the heavens» William Herschel, Philosophical Transactions of the Royal Society of London, 1 January 1789; DOI:10.1098/rstl.1789.0021
• [465] «Catalogue of 500 new nebulae, nebulous stars, planetary nebula:, and clusters of stars; with remarks on the construction of the heavens» William Herschel, Philosophical Transactions of the Royal Society of London, 1 January 1802; DOI:10.1098/rstl.1802.0021
• [466] «Observations of nebulæ and clusters of stars, made at Slough, with a twenty-feet reflector, between the years 1825 and 1833» John Frederick William Herschel, Philosophical Transactions of the Royal Society of London, 1 January 1833, Pages: 359-505; DOI:10.1098/rstl.1833.0021
• [467] «Catalogue of nebulae and clusters of stars» John Frederick William Herschel, Philosophical Transactions of the Royal Society of London, 1 January 1864; DOI:10.1098/rstl.1864.0001
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• [485] «Observations on the Nebulae» William Parsons; Philosophical Transactions of the Royal Society of London, Volume 140, published 1 January 1850; DOI:10.1098/rstl.1850.0026
• [486] «On the construction of specula of six-feet aperture; and a selection from the observations of nebulæ made with them» William Parsons; Philosophical Transactions of the Royal Society of London, Volume 151, published 1 January 1861; DOI:10.1098/rstl.1861.0029
• [487] «Further observations upon the nebulae, with practical details relating to the construction of large telescopes» William Parsons; Proceedings of the Royal Society of London, Volume 11, published 1 January 1862; DOI:10.1098/rspl.1860.0078
• [488] «An account of the observations on the great nebula in Orion, made at Birr Castle, with the 3-feet and 6-feet telescopes, between 1848 and 1867. With a drawing of the nebula» William Parsons; Philosophical Transactions of the Royal Society of London, Volume 158, published 1 January 1868; DOI:10.1098/rstl.1868.0004
• [528] «Results of examination of southern nebulae with the spectroscope» John Herschel, Proceedings of the Royal Society of London, 1 January 1868; DOI:10.1098/rspl.1867.0101

Wikipedia

• [258] Arecibo message; en.wikipedia.org/wiki/Arecibo_message (2021-02-03)
• [268] Theta Orionis; en.wikipedia.org/wiki/Theta_Orionis (2021-02-14)
• [299] Sh2-155; en.wikipedia.org/wiki/Sh2-155 (2021-03-25)
• [363] Wikipedia (deutsch): IC 2120; de.wikipedia.org/wiki/IC_2120 (2021-05-26)
• [364] Wikipedia (français): IC 2120; fr.wikipedia.org/wiki/IC_2120 (2021-05-26)
• [453] Walter Baade; en.wikipedia.org/wiki/Walter_Baade (2021-12-02)

WWW et al.

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• [165] Flickr: Judy Schmidt; flickr.com/people/geckzilla (2021-01-02)
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• [212] «Fossils of the distant Galaxy: NGC 5466 and its stellar stream» Jaclyn Jensen, University of Victoria, 2020; dspace.library.uvic.ca/handle/1828/12440 (2021-05-19)
• [235] Astronomers Measure Mass of Supermassive Black Hole in NGC 1097; sci-news.com/astronomy/science-supermassive-black-hole-ngc1097-02928.html (2021-01-20)
• [248] Crab Nebula (one decade time-lapse movie) by Detlef Hartmann; vimeo.com/253674871 (2021-01-24)
• [252] EZgif; ezgif.com
• [267] The Webb Deep-Sky Society; webbdeepsky.com (2021-02-13)
• [271] «The Unexplored Nebula Project» Steve Mandel; aicccd.com/archive/aic2005/The_unexplored_nebula_project-smandel.pdf (2021-12-25)
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• [277] «Historische Deep-Sky Kataloge» von Dr. Wolfgang Steinicke; klima-luft.de/steinicke (2021-02-17)
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• [296] NGC 40: Astronomers Find New Evidence for the Violent Demise of Sun-Like Stars; chandra.harvard.edu/photo/2005/n40 (2021-03-21)
• [303] List of Supernovae; cbat.eps.harvard.edu/lists/Supernovae.html (2021-04-08)
• [304] All active supernova over mag 17.0; rochesterastronomy.org/supernova.html (2021-04-08)
• [325] Planetary nebula Jones-Emberson 1; britastro.org/node/7191 (2021-05-04)
• [396] «William Lassell's (1799-1880) telescopes and the discovery of Triton» Pedro Ré; astrosurf.com/re/william_lassell_telescopes.pdf (2021-06-25)
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• [441] «The Ghost of a Dwarf Galaxy: Fossils of the Hierarchical Formation of the Nearby Spiral Galaxy NGC 5907»; cosmotography.com/images/small_ring_ngc5907.html (2021-10-05)
• [498] Dark-Sky Switzerland Nachtkarten; darksky.ch/dss/de/aktivitaeten/nachtkarten (2022-02-26)
• [499] Kostenlose Schweizerkarten mit Kantone und Seen zum Ausdrucken; vorla.ch/schweizerkarte (2022-02-26)
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• [502] Dark Skies Awareness, Sky Brightness Nomogram; darkskiesawareness.org/nomogram.php (2022-02-27)
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