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Contains:  M 31, Great Nebula in Andromeda, NGC 224, M 32, NGC 221, M 110, NGC 205
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M31 Andromeda, 





    
        

            Michael Southam
M31 Andromeda

M31 Andromeda

Technical card

Resolution: 4968x3264

Dates:Dec. 22, 2016Dec. 24, 2016Dec. 25, 2016

Frames: 94x300" ISO200

Integration: 7.8 hours

Darks: ~20

Flats: ~20

Bias: ~20

Avg. Moon age: 24.91 days

Avg. Moon phase: 23.00%

Astrometry.net job: 1389437

RA center: 10.612 degrees

DEC center: 41.279 degrees

Pixel scale: 1.339 arcsec/pixel

Orientation: -70.059 degrees

Field radius: 1.105 degrees

Locations: Home Observatory, Shelton, Connecticut, United States

Description

Data captured on the nights of December 22nd, 24th and 25th 2016 and processed in Pixinsight using David Aldrich's workflow. I took David's advice and kept the exposures short. I had wanted to increase the ISO too but the subs looked overexposed so I kept to 200. In hindsight, PI does such a great job of background neutralization that I think I would have been safe at 400.

I didn't start capturing until after M31 crossed the Meridian (to avoid a flip) pretty much at the zenith and stopped exposures around 30 degrees above the horizon in the West when local sky glow starts impacting the data noticeably. The last set of subs from Dec 25 were taken with PHD2 after advice from Astrobin user Wei-Hao Wang in this AB forum last week. Very glad to have made the switch.

The target was a test to see if I could get decent results with my Explore Scientific Achromatic Refractor or if it's use would be limited to visual. I'm pleased but you be the judge. Certainly beats my last effort.

Comments

Author

msoutham
Michael Southam
License: Attribution-NonCommercial-ShareAlike Creative Commons
4553
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Revisions

  • M31 Andromeda, 





    
        

            Michael Southam
    Original
  • M31 Andromeda, 





    
        

            Michael Southam
    B
  • Final
    M31 Andromeda, 





    
        

            Michael Southam
    C

B

Green-b-gone

C

Curves

Sky plot

Sky plot

Histogram

M31 Andromeda, 





    
        

            Michael Southam

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