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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 Galaxy, 


M31 Andromeda Galaxy

M31 Andromeda Galaxy

Technical card

Resolution: 5085x3349

Dates:Aug. 26, 2014

Frames: 101x60" ISO1600

Integration: 1.7 hours

Darks: ~36

Flats: ~40

Bias: ~30

Avg. Moon age: 0.81 days

Avg. Moon phase: 0.73%

Temperature: 15.00 job: 354782

RA center: 0h 42' 45"

DEC center: +41° 13' 51"

Pixel scale: 1.088 arcsec/pixel

Orientation: -92.304 degrees

Field radius: 0.920

Locations: Suburban backyard N/O Seattle, Lynnwood, WA, United States


Another attempt to image M31 with more integration time. The stars are distorted, maybe a collimation problem. The stars appeared to be good when I took the first M31 shot, but I did not like the framing. I rotated the camera in the focuser but did not recheck focus. The subsequent shots were framed as I wanted but not as good of focus and/or collimation than the test shot.

I also have trouble getting the fainter edges of the galaxy to be brighter or stand out more. When I make the faint areas more visible I also introduce more noise over the entire image.

The temperature ranged from 58 to 61 degrees F while taking the light. I stacked the best 95 percent of 107 subexposures. The flats were taken at ISO 3200 which DSS warned me about.

The G11 mount was unguided with PEC turned off.



License: None (All rights reserved)

Sky plot

Sky plot


M31 Andromeda Galaxy,