Hemisphere:  Northern  ·  Constellation: Cancer (Cnc)  ·  Contains:  PK219+31.1  ·  Sh2-290
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Abell 31 | SH2-290, 


            Kevin Morefield
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Abell 31 | SH2-290

Imaging cameras: QHYCCD QHY600M

Mounts: Planewave L-350

Guiding telescopes or lenses: Planewave CDK14

Guiding cameras: Starlight Express UltraStar Mono

Software: Topaz DeNoise AI  ·  CCDWare CCDStack 2  ·  Topaz DeNoise 5  ·  CCDWare CCDAutoPilot 5  ·  Adobe Photoship CC

Filters: Astrodon OIII 3 nm  ·  Astrodon Ha 5 nm

Dates:Jan. 18, 2021

Astrodon Ha 5 nm: 33x1200" (gain: 56.00) -10C bin 2x2
Astrodon OIII 3 nm: 30x1200" (gain: 56.00) -10C bin 2x2

Integration: 21.0 hours

Darks: ~20

Flats: ~20

Bias: ~85

Avg. Moon age: 5.24 days

Avg. Moon phase: 27.97%

Bortle Dark-Sky Scale: 3.00

Astrometry.net job: 4192139

RA center: 8h 54' 14"

DEC center: +8° 52' 25"

Pixel scale: 0.609 arcsec/pixel

Orientation: 50.669 degrees

Field radius: 0.425 degrees

Resolution: 4097x2923

Locations: Sierra Remote Observatory, Auberry, California, United States

Data source: Own remote observatory

Remote source: Sierra Remote Observatories


One of the largest Planetary Nebulae in the sky, Abell 31 is also quite dim. Age expands and dims these objects and this is described as "ancient" though I found no absolute age.

This image an HOO in color but luminance is HO 50/50. Without adding a separate Luminance I find that the O channel is to over represented. This leads to excess noise as the O is usually the weakest.

There's really not much that processing adds to this object. It's quite diffused and seems to lack sharp features - which was a good fit for turbulent Winter skies. The big challenge is noise reduction and dealing with banding artifacts since the signal is so close to the noise floor everywhere except the primary nebulosity.



    Abell 31 | SH2-290, 


            Kevin Morefield
  • Final
    Abell 31 | SH2-290, 


            Kevin Morefield


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Abell 31 | SH2-290, 


            Kevin Morefield