Hemisphere:  Northern  ·  Constellation: Coma Berenices (Com)  ·  Contains:  IC3943  ·  IC3946  ·  IC3947  ·  IC3949  ·  IC3955  ·  IC3957  ·  IC3959  ·  IC3960  ·  IC3963  ·  IC3968  ·  IC3973  ·  IC3976  ·  IC3998  ·  IC4011  ·  IC4012  ·  IC4021  ·  IC4026  ·  IC4030  ·  IC4033  ·  IC4040  ·  IC4041  ·  IC4042  ·  IC4044  ·  IC4045  ·  IC4051  ·  IC839  ·  NGC 4848  ·  NGC 4874  ·  NGC 4889  ·  NGC 4895  ·  And 339 more.
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Coma Cluster, 


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Coma Cluster

Technical card

Imaging telescopes or lenses: AG Optical 12.5" iDK

Imaging cameras: FLI PL16803

Mounts: Astro-Physics 1100 GTO

Guiding cameras: Starlight Xpress Ultrastar

Software: SharpCap  ·  CCDWare PemPro  ·  PHD Labs PHD 2 Guiding  ·  Starkeeper Software Voyager  ·  Pixinsight

Filters: Chroma Blue 50mm Square  ·  Chroma Green 50mm Square  ·  Chroma Red 50mm Square

Dates:Feb. 20, 2021

Chroma Blue 50mm Square: 32x300" bin 1x1
Chroma Green 50mm Square: 36x300" bin 1x1
Chroma Red 50mm Square: 43x300" -35C bin 1x1

Integration: 9.2 hours

Darks: ~16

Flats: ~20

Bias: ~150

Avg. Moon age: 8.02 days

Avg. Moon phase: 56.80%

Bortle Dark-Sky Scale: 7.00

Mean SQM: 19.20

Astrometry.net job: 4256631

RA center: 12h 59' 51"

DEC center: +27° 57' 55"

Pixel scale: 0.435 arcsec/pixel

Orientation: -134.877 degrees

Field radius: 0.693 degrees

Resolution: 8138x8101

Data source: Backyard


Had a few nights to try out some RGB imaging from by backyard. I don't do much RGB work because of my suburban location. To do the target real justice I would need far more time under these skies, but still some interesting bits resolved pretty well.

Using the annotate feature in Pixinsight there are 350 cataloged PGC objects in the field, with a handful of NGC objects as well. There look to be hundreds, possibly thousands, more that are visible in the deep background. Most of the deep background objects are more than smudges, but you can tell that they are not stars. I'm including the annotated version in one of the revisions.



  • Coma Cluster, 


  • Coma Cluster, 


  • Coma Cluster, 


  • Final
    Coma Cluster, 




Description: Fixed a slight red cast

Uploaded: ...

Sky plot

Sky plot


Coma Cluster,