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Contains:  The star 9Cas
Getting plate-solving status, please wait...

Abell 85 - a faint supernova remnant in Cassiopeia

Technical card

Resolution: 3266x2440

Dates:Sept. 11, 2018

Astrodon Tru-Balance LRGB E-Series Gen 2 Blue: 24x600" bin 1x1
Astrodon Tru-Balance LRGB E-Series Gen 2 Green: 24x600" bin 1x1
Astrodon Ha 5nm: 33x1200" bin 1x1
Astrodon OIII 5nm: 43x1200" bin 1x1
Astrodon Tru-Balance LRGB E-Series Gen 2 Red: 24x600" bin 1x1

Integration: 37.3 hours

Avg. Moon age: 1.96 days

Avg. Moon phase: 4.28% job: 2758311

RA center: 359.889 degrees

DEC center: 62.563 degrees

Pixel scale: 2.093 arcsec/pixel

Orientation: 90.669 degrees

Field radius: 1.185 degrees

Locations: E-EyE, Fregenal de la Sierra, Extremadura, Spain

Data source: Unknown


George Ogden Abell (1927 – 1983) was a research astronomer at UCLA. He produced two astronomical catalogues, derived from the photographic plates of the National Geographic Society - Palomar Observatory Sky Survey (NGS-POSS). These are the Abell catalog of rich clusters of galaxies (1958), and a list of 86 planetary nebulae (1966).

This image is catalogued as Abell ‘planetary’ 85. However, we now know that it is not a planetary nebula. Rather it is a faint supernova remnant located 7,500 – 11,000 light years from Earth in the constellation of Cassiopeia. Abell 85 spans some 100 light years and occupies an area of the sky similar to that of the full moon.

Abell 85 has also been catalogued as radio source CTB 1 ('CalTech obs list B'; Wilson & Bolton, 1960) and LBN 576 (Catalogue of Bright Nebulae, published by Beverly Lynds in 1965).

Abell 85 is an extremely faint object and, despite gathering a large amount of data, the processing was a significant challenge.

Data for this object were captured between 31 August and 11 September 2018, from a remote imaging rig (located in Spain) that is jointly owned and operated by Barry Wilson and me.

Capture details are as follows:

Telescope: Takahashi FSQ 106
Camera: QSI 683 WSG
Filters: Astrodon
Mount: 10 Micron GM1000HPS

Ha: 33 x 1200s
OIII: 43 x 1200s
Red: 24 x 600s
Green: 24 x 600s
Blue: 24 x 600s

A total of 37.3 hours exposure.

Data Capture: Steve Milne & Barry Wilson
Image Processing: Steve Milne



Steve Milne



I've gone back to this, using some newly learned tricks, in an effort to bring out the faint stuff a bit more.

Sky plot

Sky plot


Abell 85 - a faint supernova remnant in Cassiopeia, 


            Steve Milne