About image
Jones-Emberson 1, also known as the Headphone Nebula or PK 164+31.1, is a 14th magnitude planetary nebula in the constellation Lynx at a distance of 1600 light years. It is a large nebula with low surface brightness: the 16.8-magnitude central star is a very blue white dwarf.
Jones-Emberson 1 will fade away over the next few thousand years, but its hot central star will take billions of years to cool.
The nebula was discovered in 1939 by Rebecca Jones and Richard M. 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.
[text from APOD/Wikipedia]
Technical data
Optic GSO RC12 Truss - Aperture
304mm, focal lenght 2432mm, f/8
Mount 10Micron GM2000 HPSII
Camera ZWO ASI 2600 MM Pro with filter wheel 7 positions
Filters Astrodon Gen2
E-Serie Tru-Balance 50mm unmounted RGB and Ha 5nm, OIII 5nm
Guiding system ZWO OAG-L with guide camera ASI 174MM
Exposure details R 29x300" bin3 -15C gain 100
G 27x300" bin3 -15C gain 100
B 32x300" bin3 -15C gain 100
Ha 39x600" bin3 -15C gain 100
OIII 46x600" bin3 -15C gain 100
Total integration 21h30'
Acquisition Voyager, PHD2
Processing Pixinsight 1.8,
Photoshop CS5, StarXTerminator, NoiseXTerminator, BlurXTerminator
SQM-L 21.07
Location Promiod (Aosta
Valley, Italy), own remote observatory
Date 31 January, 4/13/14 February 2024