Planetary Nebula NGC 6842

NGC 6842
NGC 6842: Planetary nebula in Vulpecula; 500 mm Cassegrain 5800 mm f/11.4; SBIG STL11K; 50+10+10+10 min LRGB; Bernese Highlands; © 2005 Radek Chromik

History

NGC 6842 was first sighted on June 28, 1863 by the German astronomer Albert Marth, independently on August 26, 1864 by the German astronomer Heinrich d'Arrest, and on July 12, 1866 by the American astronomer Truman Safford. Nature as a planetary nebula was discovered by Curtis in 1919.

Physical Properties

It is a planetary nebula about 0.9 arc minutes in diameter. Visual brightness ratings range from 13 mag to 16 mag. The distance is 1380 pc (4500 light years). [145, 196]

«Strasbourg-ESO Catalogue of Galactic Planetary Nebulae» Acker et al., 1992 [141]
DesignationsPN G065.9+00.5: NGC 6842, PK 65+00.1, ARO 106, He 2- 451, Sh 1- 72, Sh 2- 95, VV 245, VV' 518
Right Ascension (J2000.0)19h 55m 03s
Declination (J2000.0)29° 17' 22"
Dimensions 57." (optical), 36." (radio)
Distance 2.3 kpc
Radial Velocity-5.0 km/s ± 25.0 km/s
Expansion Velocity 35.0 km/s (O-III)
C-Star DesignationsAG82 388, CSI +29 -19529, PLX 4708
C-Star Magnitude14.75 mag (U filter), 15.65 mag (B filter), 15.98 mag (V filter)
DiscovererCURTIS 1919

Finder Chart

The planetary nebula NGC 6842 is located on the border of the constellation Vulpecula and Cygnus, about 40 arc minutes east of the small open star cluster NGC 6834. The months of May to October are the best viewing times.

Vulpecula: NGC 6842
Chart NGC 6842
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)