Headphone Nebula (JnEr 1)

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 apparent visual brightnes of the nebula is 17.1 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)07h 57m 53s
Declination (J2000.0)+53° 25' 18"
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 17 March 1790 by Wilhelm Herschel and NGC 2475 on 9 January 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+Historic NGC/IC, Version 22/9, © Dr. Wolfgang Steinicke [277]
NameRADecTypebMagvMagB-VSBDimPAzD(z)MDDreyer DescriptionIdentification, Remarks
NGC 247407 58 00.3+52 51 44Gx (E0) × 0.80.01862378.66F, pS, E ?, bMvS * ?, L * nfUGC 4114, MCG 9-13-97, CGCG 262-52, KCPG 147B, NPM1G +52.0051
NGC 247507 57 58.8+52 51 26Gx (E0) × 0.60.01877679.31Makes 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.

Finder Chart Headphone Nebula (JnEr 1)
Headphone Nebula (JnEr 1) in constellation Lynx. 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

400 mm Aperture: In the 21 mm Ethos eyepiece (85x) and without filter, the position of the PN can be clearly determined thanks to the conspicuous star formation consisting of a large and small triangle. The brightest area of the nebula is just barely discernible without the O-III filter, especially if the image moves a little during search movements. With O-III filter the nebula appears faint and diffuse and a slightly darker centre, overall fainter than Jones 1 in Pegasus. — 400 mm f/4.5 Taurus Dobsonian, Ibergeregg, SQM 21.2, 27. 11. 2022, 01:10, Bernd Nies

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