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M37

Open Cluster
aka NGC 2099, Melotte 38, Collinder 75, Raab 28, OCL 451
RA: 05h52m22.3s, Dec: +3232'40" (2000) in Auriga
Magnitude: 6.20
Size: 23.0'
Distance: 4400 ly
Age: 199 Myrs
    

Minimum requirements to detect: any telescope under urban skies

Messier 37 is one of the finest open clusters, particularly for smaller telescopes (< 10 inches).  Sometimes overshadowed by it's neighbors M36 and M38, this cluster is not to be overlooked.

There are some 150 stars down to magnitude 12.5 within a 23' circle.  This cluster of stars formed together around 200 million years ago and lies at a distance of 4400 light years.  

The field in an 6-inch f/8 at 50x.  North is down and east is to the right.

 
Millennium Star Atlas Vol I Chart 134
Sky Atlas 2000 Chart 5
Uranometria 2000 Vol I Chart 98
Uranometria 2nd Ed. Chart 59
Herald-Bobroff Astroatlas B-13 C-35