Planetary Nebula NGC 7048

NGC 7048
NGC 7048: Planetary nebula in Cygnus; 500 mm Cassegrain 5800 mm f/11.4; SBIG STL11K; 60+10+10+10 min LRGB; Bernese Highlands; © 2005 Radek Chromik

History

The planetary nebula NGC 7048 was discovered by French astronomer Édouard Stephan on October 19, 1878. [196]

Physical Properties

Visual brightness is given as 11 or 12 magnitudes. The nebula has an ellipsoidal shape, which is slightly brighter on the western and eastern edges. Infrared images suggest that the nebula has a bi-polar shape similar to a butterfly, tilted about 60° in the line of sight. Due to the nebula's low surface brightness, it is believed to be well advanced in its evolution. The angular diameter is about one arc minute and the distance 1613 pc (about 5200 light years). The white dwarf star in the center has a brightness of about 19 mag. [145, 196, 322]

«Strasbourg-ESO Catalogue of Galactic Planetary Nebulae» Acker et al., 1992 [141]
DesignationsPN G088.7-01.6: NGC 7048, PK 88-01.1, ARO 41, Hb 9, VV 262, VV' 545
Right Ascension (J2000.0)21h 14m 16s
Declination (J2000.0)46° 17' 19"
Dimensions 61." (optical), 70." (radio)
Distance1.3 kpc - 2.5 kpc
Radial Velocity-50.2 km/s ± 8.1 km/s
Expansion Velocity 15. km/s (O-III)
C-Star DesignationsAG82 424
C-Star Magnitude19.12 mag (V filter)
DiscovererCURTIS 1919

Finder Chart

The planetary nebula NGC 7048 is located in the constellation Cygnus (Swan), roughly between the two stars Deneb (α Cygni) and ρ Cygni, one third closer to ρ Cygni. Only 3' 20" away is the 8.2 mag bright star SAO 50601. The best observation time is from April to November.

Chart NGC 7048
Chart created using SkySafari 6 Pro and STScI Digitized Sky Survey. [149, 160]

References

141Strasbourg-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); cdsarc.unistra.fr/viz-bin/cat/V/84 (2021-02-18)
145SIMBAD astronomical database; simbad.u-strasbg.fr/simbad
149SkySafari 6 Pro, Simulation Curriculum; skysafariastronomy.com
160The STScI Digitized Sky Survey; archive.stsci.edu/cgi-bin/dss_form
196Celestial Atlas by Curtney Seligman; cseligman.com/text/atlas.htm (2020-12-28)
322«Near-infrared spectroscopy of (proto)-planetary nebulae: molecular hydrogen excitation as an evolutionary tracer» Christopher J. Davis, Michael D. Smith, Luke Stern, Thomas H. Kerr, Jean E. Chiar; Monthly Notices of the Royal Astronomical Society, Volume 344, Issue 1, September 2003, Pages 262–282; DOI:10.1046/j.1365-8711.2003.06820.x