Planetary Nebula Jones 1 (PK 104-29.1)

Jones 1
Jones 1: Planetary nebula in Pegasus; 500 mm Cassegrain 5800 mm f/11.4; SBIG STL11K; 480+120+120+120 min LRGB; Bernese Highlands; © 2017 Radek Chromik [32]


The planetary nebula Jones 1 (Jn 1, PK 104-29.1, VV '578) was discovered in 1941 by the American astronomer Rebecca Jones on photo plates of the Harvard Observatory. Two years earlier, together with Richard M. Emberson, she discovered another planetary nebula: Jones-Emberson 1 (PK 164+31.1) in the constellation Lynx. [325]

The designation PK 104-29.1 comes from the two Czechoslovak astronomers Luboš Perek and Luboš Kohoutek, who in 1967 compiled a catalog of all the planetary nebulae of the Milky Way known at the time. The designation VV '578 goes back to the Russian astronomer Boris Vorontsov-Velyaminov, who studied and classified planetary nebulae in addition to cataloging galaxies. [145]

Physical Properties

Jones 1
Jones 1: Image taken with the 4m Mayall telescope on Kitt Peak. © T.A. Rector/University of Alaska Anchorage, H. Schweiker/WIYN and NOIRLab/NSF/AURA [328]

Jones 1 is a large planetary nebula with an angular diameter of 320 arcseconds, but a faint with only 15 magnitudes. The central star is 16.8 magnitudes bright and the nebula itself 15.6 magnitudes. Distance measurements range from 716 pc to 826 pc (around 2300 to 2700 light years). [145]

«Strasbourg-ESO Catalogue of Galactic Planetary Nebulae» Acker et al., 1992 [141]
Designations PN G104.2-29.6: Jn 1, PK 104-29.1, ARO 195, VV' 578
Right Ascension (J2000.0) 23h 35m 54s
Declination (J2000.0) +30° 28' 02"
Dimensions 320." (optical)
Radial Velocity -67.0 km/s
Expansion Velocity 15. (O-III) km/s
C-Star Designations AG82 454
C-Star Magnitude U: 14.47, B: 15.72, V: 16.13
C-Star Spectral Type Of/WR(C)?
Discoverer JONES 1941

Finder Chart

The planetary nebula Jones 1 is located in the constellation Pegasus, about 1° southeast of the 4.9 mag bright star 72 Pegasi. It is circumpolar in Central Europe, but the best time to observe it is June to December, when the constellation is highest at night.

Finder Chart Planetary Nebula Jones 1 (PK 104-29.1)
Planetary Nebula Jones 1 (PK 104-29.1) in constellation Pegasus. Charts created using SkySafari 6 Pro and STScI Digitized Sky Survey. Limiting magnitudes: Constellation chart ~6.5 mag, DSS2 close-ups ~20 mag. [149, 160]

Visual Observation

300 mm Aperture: In the 21 mm Ethos eyepiece, the PN is invisible without an O-III filter. However, its position can be clearly determined from the stars. With the O-III filter, the PN appears very faint, round and somewhat darker in the centre. The split structure can be guessed at. — 300 mm f/4 Popp Newton, Titlis 3020 m. a.s.l., SQM 21.25, 29 October 2022, 22:45, Bernd Nies

320 mm Aperture: Starting from the 300 mm Newtonian of the star friend and his eyepiece and OIII filter, the PN Jones 1 also revealed itself in the Ninja. The PN shows a ring structure, which is not completely circumferential. Only in the 457 mm Newtonian of another astro colleague two clearly defined ring segments could be seen. — 12.5" f/4.5 Ninja Dobsonian, Titlis 3020 m. a.s.l., SQM 21.25 m/s2, 29. 10. 2022, Eduard von Bergen

400 mm Aperture: The nebula is very faint in the O-III filter, but directly visible. With averted vision, a bright, subdivided edge and darker interior can be seen. In the H-β filter, as well as without filter, the nebula remains invisible. At slightly higher magnification (16 mm Nagler, 112x) the shape is more clearly defined, but remains very faint. — 400 mm f/4.5 Taurus Dobsonian, Ibergeregg, SQM 21.1, 26. 11. 2022, 21:30, Bernd Nies

Objects Within a Radius of 15°