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Contains:  PK164+31.1
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Jones-Emberson 1

Technical card

Dates:Feb. 7, 2020March 14, 2020March 15, 2020

Baader Ha 1.25" 7nm: 36x600" (gain: 200.00) -20C bin 1x1
Baader Planetarium O3 1.25" 8.5nm: 43x600" (gain: 200.00) -20C bin 1x1

Integration: 13.2 hours

Darks: ~70

Flats: ~31

Flat darks: ~100

Avg. Moon age: 18.05 days

Avg. Moon phase: 75.25% job: 3359349

RA center: 7h 57' 56"

DEC center: +53° 25' 6"

Pixel scale: 0.493 arcsec/pixel

Orientation: -85.567 degrees

Field radius: 0.437 degrees

Resolution: 5313x3529

Locations: Nürnberg, Nürnberg, Bayern, Germany

Data source: Backyard


Object description (

Jones-Emberson 1 (PK 164+31.1), also known as the Headphone Nebula, is a 14th magnitude planetary nebula in the constellation Lynx at a distance of 1600 light years. It is a larger planetary with low surface brightness. The 16.8-magnitude central star is a very blue white dwarf.

Discovered in 1939 by R. Jones and R. Emberson, its "PK" designation comes from the names of Czechoslovakian astronomers Luboš Perek and Luboš Kohoutek, who in 1967 created an extensive catalog of all of the planetary nebulae known in the Milky Way as of 1964. The numbers indicate the position of the object on the sky. ("PK 164+31.1" basically represents the planetary nebula that when using the galactic coordinate system has a galactic longitude of 164 degrees, a galactic latitude of +31 degrees, and is the first such object in the Perek-Kohoutek catalog to occupy that particular one square degree area of sky).



Thomas Richter

Sky plot

Sky plot


Jones-Emberson 1, 


            Thomas Richter