JnEr 1, Headphone Nebula

Jones-Emberson 1
Jones-Emberson 1: Headphone Nebula in Lynx; 500 mm Cassegrain 5800 mm f/11.4; SBIG STL11K; 240+40+40+40 min LRGB; Bernese Highlands; © 2005 Radek Chromik


The planetary nebula Jones-Emberson 1 (JnEr 1, PK 164+31.1, VV 47, VV '74) was discovered in 1939 by the American astronomers Rebecca Jones and Richard M. Emberson on photo plates of the Harvard Observatory. She discovered another planetary nebula that bears her name: Jones 1 (PK 104-29.1) in the constellation Pegasus. [325]

The designation PK 164+31.1 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 47 or VV '74 goes back to the Russian astronomer Boris Vorontsov-Velyaminov, who studied and classified planetary nebulae in addition to cataloging galaxies. Because of its appearance, the nebula was also nicknamed «Headphone Nebula». [145]

Physical Properties

JnEr 1 is a 13,000 year old planetary nebula with an angular diameter of about 380 arc seconds and a low surface brightness. In the center there is a white dwarf star with 0.63 solar masses and 16.8 magnitudes. The distance is 578 pc (around 1800 light years). [145, 325, 326, 327]

«Strasbourg-ESO Catalogue of Galactic Planetary Nebulae» Acker et al., 1992 [141]
DesignationsPN G164.8+31.1: JnEr 1, PK 164+31.1, ARO 121, VV 47, VV' 74
Right Ascension (J2000.0)7h 57m 53s
Declination (J2000.0)53° 25' 19"
Dimensions 380." (optical)
Radial Velocity-84.3 km/s ± 8.8 km/s
Expansion Velocity 22.0 km/s (O-III), 41. km/s (N-II)
C-Star DesignationsAG82 95
C-Star Magnitude15.26 mag (U filter), 16.53 mag (B filter), 16.83 mag (V filter)
DiscovererJONES et al 1939

Galaxies NGC 2474 and NGC 2475

The two elliptical galaxies NGC 2474 and NGC 2475 are around 13 magnitudes bright and are located 33 arc minutes south of the planetary nebula JnEr 1. NGC 2474 was discovered on March 17, 1790 by Wilhelm Herschel and NGC 2475 on January 9, 1856 by RJ Mitchell . The PN is often confused with these NGC numbers, but J. L. E. Dreyer's description clearly fits these two galaxies. [145, 196]

«Revised New General Catalogue and Index Catalogue», «Historically Corrected New General Catalogue», Dr. Wolfgang Steinicke, 2021 [277]
NameRADecTypeBmagVmagDimDreyer DescriptionIdentification
NGC 2474 07 58 00.3+52 51 44Gx (E0) × 0.8F, pS, E ?, bMvS * ?, L * nfUGC 4114, MCG 9-13-97, CGCG 262-52, KCPG 147B, NPM1G +52.0051
NGC 2475 07 57 58.8+52 51 26Gx (E0) × 0.6Makes D neb with h 471UGC 4114, MCG 9-13-96, CGCG 262-52, KCPG 147A

Finder Chart

The planetary nebula Jones-Emberson 1 is located in the constellation Lynx, about 2.5 ° northwest of the 4.8 mag bright star 27 Lyncis. It is circumpolar in Central Europe, but the best time to observe it is November to April, when the constellation is highest at night.

Chart Jones-Emberson 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); 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)
277«Historische Deep-Sky Kataloge» von Dr. Wolfgang Steinicke; klima-luft.de/steinicke (2021-02-17)
325Planetary nebula Jones-Emberson 1; britastro.org/node/7191 (2021-05-04)
326«HIDDEN MOLECULES IN PLANETARY NEBULAE: NEW DETECTIONS OF HCN AND HCO+ FROM A MULTI-OBJECT SURVEY» D. R. Schmidt and L. M. Ziurys; The Astrophysical Journal, Volume 817, Number 2; DOI:10.3847/0004-637X/817/2/175
327«The Population of Galactic Planetary Nebulae: a Study of Distance Scales and Central Stars Based on the Second Gaia Release» Letizia Stanghellini, Beatrice Bucciarelli, Mario G. Lattanzi, and Roberto Morbidelli; The Astrophysical Journal, Volume 889, Number 1; DOI:10.3847/1538-4357/ab59e4