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This is a rich open cluster, discovered in 1764 by Charles Messier. It has more than 500 stars, 150 of which are brighter than magnitude 12.5. M37 is richly populated with blue A stars, as well as at least a dozen red giant stars. Its age is about 300 million years.
Additional Information
Object
Name(s): 37, NGC 2099
Type: Open Cluster
RA: 05h 52m 17s
Dec: +32º 32’ 54”
Constellation: Auriga
Size (arcmin): 14×14
Magnitude: +5.6
Distance: 4,500 ly
Image
Date: 2013-03-06
Location: Corbera de Llobregat, Barcelona, Catalonia
Size (arcmin): 32×25
Telescope: Celestron 11” HD f/10
Camera: FLI ML6303 (3072x2048pix)
Guiding: Orion SSAG/Nikkor 500mm f/8
Total exposure: 40min (L: 10min; RGB: 30min)
Processing: PixInsight