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


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 [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. 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]
DesignationsPN 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' 03"
Dimensions 320." (optical)
Radial Velocity-67.0 km/s ± km/s
Expansion Velocity 15. km/s (O-III)
C-Star DesignationsAG82 454
C-Star Magnitude14.47 mag (U filter), 15.72 mag (B filter), 16.13 mag (V filter)
C-Star Spectral TypeOf/WR(C)?
DiscovererJONES 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 November, when the constellation is highest at night.

Chart Jones 1
Chart created using SkySafari 6 Pro and STScI Digitized Sky Survey. [149, 160]


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); (2021-02-18)
145SIMBAD astronomical database;
149SkySafari 6 Pro, Simulation Curriculum;
160The STScI Digitized Sky Survey;
325Planetary nebula Jones-Emberson 1; (2021-05-04)
328Jones 1, PK 104-29.1; (2021-05-05)