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Contains:  M 3, NGC 5272
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M 3 Cluster, 


            Michael Timm
M 3 Cluster

M 3 Cluster

Technical card

Resolution: 6376x4316

Dates:April 20, 2019

Frames: 140x60" (gain: 120.00) -20C bin 1x1

Integration: 2.3 hours

Darks: ~346

Flats: ~50

Flat darks: ~50

Avg. Moon age: 15.89 days

Avg. Moon phase: 98.58%

Bortle Dark-Sky Scale: 4.00

Mean SQM: 19.10

Temperature: 8.00 job: 2652680

RA center: 205.547 degrees

DEC center: 28.378 degrees

Pixel scale: 0.403 arcsec/pixel

Orientation: 90.355 degrees

Field radius: 0.431 degrees

Locations: Backyard, Vechelde, Niedersachsen, Germany

Data source: Backyard


Moon is near full these days, so there are only star clusters available for OSC-owners like me. I revisited M3 and i am happy with the result. Guiding was not good, but not bad either, seeing was incredible good.

This evening i first used my new SQM-L to measure background illumination of the sky. During imaging i made three runs of three measurements each. Results where: 19.3, 19.1 and 18.9, which combines to a total of 19.1. This is somewhere between bortle 5 and 6 i think, which is okay for a moon that bright. I am curious what further measurements especially without moon will show...



Michael Timm
License: None (All rights reserved)

Sky plot

Sky plot


M 3 Cluster, 


            Michael Timm