M50 - NGC 2323

Messier 50 (NGC 2323) is a moderately rich open cluster in the constellation Monoceros, located approximately 3,200 light-years from Earth. The cluster contains roughly 200 stars within a diameter of about 20 light-years and shines at a combined apparent magnitude of about 5.9, placing it at the very edge of naked-eye visibility under excellent conditions. M50 is estimated to be around 78 million years old, and its stellar population includes mostly hot blue-white main-sequence stars along with a notable red giant star near the cluster's center that stands out prominently against its bluer neighbors. This color contrast is one of the cluster's most appealing visual characteristics. M50 was discovered by Charles Messier on April 5, 1772, though it may have been observed earlier by Giovanni Domenico Cassini before 1711. The cluster spans about 16 arcminutes of sky and has a distinctive heart-shaped or somewhat triangular outline that is apparent at moderate magnification. Through binoculars, M50 appears as a bright, nebulous patch with a handful of resolved stars. A small telescope at moderate magnification reveals several dozen stars arranged in an attractive pattern with chains and curves, anchored by the central red giant. The overall impression is of a compact and well-defined cluster that stands out nicely from the surrounding Monoceros star fields. M50 lies roughly halfway between Sirius in Canis Major and Procyon in Canis Minor, making it straightforward to locate on winter and early spring evenings. While not among the most famous open clusters, M50 is a pleasing and underrated target that rewards careful observation.

Contains approximately 200 stars within 20 light-years diameter at a distance of 3,200 light-years, with an age of about 78 million years.