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Contains:  NGC 884, Double cluster, NGC 869, The star 7Per
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Perseus Double Cluster - NGC 869 and NGC 884, 





    
        

            Rowland Archer
Perseus Double Cluster - NGC 869 and NGC 884

Perseus Double Cluster - NGC 869 and NGC 884

Technical card

Resolution: 4550x3376

Dates:Nov. 25, 2017

Frames: 187x60"

Integration: 3.1 hours

Avg. Moon age: 6.28 days

Avg. Moon phase: 38.39%

Astrometry.net job: 2067006

RA center: 35.206 degrees

DEC center: 57.154 degrees

Pixel scale: 0.912 arcsec/pixel

Orientation: 2.475 degrees

Field radius: 0.717 degrees

Locations: Home Observatory, Wake Forest, NC, United States

Data source: Unknown

Description

NGC 869 / 884 in Perseus - RGB

Shot 100 each of R, G, B, kept 66 R, 49 G, 72 B. Shot 500 L's and decided that L didn't add anything to this after processing as RGB and LRGB both. L had some saturation that resulted in blotchy color in a few of the brighter stars.

Pre-processed with the new 1.060 AstroPixelProcessor which has multi-channel processing. I think it does a great job.

Then over to PI for ABE 3 times, DBE once, MLT Noise Reduction, HistogramTransformation, TGV Denoise, a bit of Curves to boost contrast and saturation, and a bit of color touchup with Saturation. Actually reduced the red a bit as some of the red stars looked unnatural to me.

Brought into Photoshop CC for Bodoni tools' "increase star color" which had a subtle effect, and resized and saved. And here we are!

A bit of what looks like chromatic aberration is visible in the brighter stars (red fringe on one side, blue on the other). I don't think it's from the optics as I haven't seen it in other shots with the same rig. I think it may be alignment, maybe red and blue taken on opposite sides of the meridian? AstroPixelProcessor's "align channels" option cleaned this up considerably compared to the result I was getting in PI.

Comments and criticism welcomed, always looking for ideas to improve!

Thanks for stopping by,
Rowland

Comments

Author

Vassar1976
Rowland Archer
License: None (All rights reserved)
930
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Revisions

  • Final
    Perseus Double Cluster - NGC 869 and NGC 884, 





    
        

            Rowland Archer
    Original
  • Perseus Double Cluster - NGC 869 and NGC 884, 





    
        

            Rowland Archer
    B
  • Perseus Double Cluster - NGC 869 and NGC 884, 





    
        

            Rowland Archer
    C
  • Perseus Double Cluster - NGC 869 and NGC 884, 





    
        

            Rowland Archer
    E

B

1920x1080 sized version

C

800x600 sized version

E

Re-processed using APP's quality estimator for integration weighting instead of SNR. Also a bit less contrasty, slightly lighter BG

Sky plot

Sky plot

Histogram

Perseus Double Cluster - NGC 869 and NGC 884, 





    
        

            Rowland Archer

In these public groups

ZWO ASI1600MM/QHY163M