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Contains:  M 31, Great Nebula in Andromeda, NGC 224, M 110, NGC 205, The star 41And, The star 22And, The star πCas, The star θAnd, The star νAnd, The star οCas, The star σAnd, The star πAnd, The star φAnd, The star μAnd, Part of the constellation Andromeda (And)
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M31 and a small surprise, 


            Dominique Callant
M31 and a small surprise

M31 and a small surprise

Technical card

Resolution: 2785x1980

Dates:Nov. 2, 2018

Frames:Optolong UHC: 47x120" ISO1600 bin 1x1

Integration: 1.6 hours

Darks: ~25

Flats: ~25

Bias: ~30

Avg. Moon age: 24.09 days

Avg. Moon phase: 29.97%

Bortle Dark-Sky Scale: 5.00

Mean SQM: 19.00 job: 2367698

RA center: 0h 40' 11"

DEC center: +41° 11' 27"

Pixel scale: 20.708 arcsec/pixel

Orientation: 267.012 degrees

Field radius: 9.828

Locations: home backyard, Houthalen, Limburg, Belgium

Data source: Backyard


The weather conditions were not super, so I decide to go for a widefield shot of M31 with the Samyang 135mm and the Canon6Da. While developing the image I noticed a small blue-greenisch dot, upper left of M31. I searched SkiSafari and found out it was comet 64P Swift-Gehrels.
A nice surprise.



Dominique Callant
License: None (All rights reserved)

Sky plot

Sky plot


M31 and a small surprise, 


            Dominique Callant