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M50
Open Cluster
aka NGC 2323, Melotte 58, Collinder 124, Raab 45, OCL 559
RA: 07h03m12.3s Dec: -08°19'28" (Monoceros)
Integrated Visual Magnitude: 7.2
Angular Diameter: 16.0'
Distance 3000 ly
Age: 78 Myrs

Minimum requirements to detect: ? under dark skies


M50 is described in Burnham's as, "an attractive group for the small telescope" and as, "a fine open cluster, located a little more than a third of the way along a line drawn from Sirius to Procyon."  Perhaps the most obvious feature of this cluster is the brightest star, which is quite red.  This 7.8 magnitude star is HD 52938, a K3 giant.  Another star to look for is the 8.5 magnitude HD 52980, a double with an 11th magnitude companion 6.8" distant.

It has been estimated that M50 contains some 200 stars.  I found this beautiful cluster that T. W. Webb called "a brilliant cluster" to be a very pleasing sight in my 18-inch.


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 273
Sky Atlas 2000 Chart 12
Uranometria 2000 Vol II Chart 273
Herald-Bobroff Astroatlas B-06 C-40