M36 - PINWHEEL CLUSTER

Messier 36 (NGC 1960) is a bright open cluster in the constellation Auriga, located approximately 4,100 light-years from Earth. It is the first of three prominent Messier clusters in Auriga (along with M37 and M38) that form one of the finest cluster trios in the entire sky. M36 contains about 60 stars within a diameter of approximately 14 light-years and shines at a combined apparent magnitude of about 6.3. The cluster is estimated to be quite young at around 25 million years old, making it the youngest of the three Auriga clusters. Its stellar population is dominated by hot blue-white B-type stars, and it notably lacks any red giant stars, consistent with its youth, as insufficient time has elapsed for even its most massive members to evolve off the main sequence. M36 was first discovered by Giovanni Battista Hodierna before 1654 and later cataloged by Messier in 1766. The cluster has been compared to a miniature version of the Pleiades (M45), sharing a similar size, brightness, and distribution of hot young stars, though at roughly three times the distance. Through binoculars, M36 appears as a bright, compact patch of unresolved light. A small telescope reveals about a dozen brighter stars scattered in a somewhat random pattern, with fainter members filling in the background. The cluster is well framed at moderate magnification and shows several close double stars among its members. M36 lies roughly midway between M37 and M38, and all three clusters can be visited in a single telescopic tour of less than 5 degrees, making them a popular winter target.

Contains about 60 stars spanning 14 light-years at a distance of 4,100 light-years, with a young age of approximately 25 million years.