M50
Heart-Shaped Cluster
物性
位置と識別子
可視性
設定で観測地を設定 すると可視性データが表示されます。
サーベイ画像
サーベイ画像を読み込み中…
M50について
説明
M50 is a moderately rich open cluster in Monoceros, about 3,200 light-years from Earth. It contains roughly 200 stars spread across about 20 light-years, with an age of about 78 million years. A prominent red giant star near the cluster's center provides a striking color contrast with the predominantly blue-white members.
観測のコツ
Located about 9 degrees due east-northeast of Sirius. Binoculars show a dense, heart-shaped patch of stars. A telescope at 60-80x reveals about 40 stars in an attractive grouping with a distinctive wedge or heart shape. Look for the orange-red giant star near the center. The cluster sits in a rich Milky Way field. Best observed from January through March.
歴史
Possibly discovered by Giovanni Domenico Cassini before 1711 and independently found by Charles Messier on April 5, 1772. Messier described it as 'a cluster of small stars.'
豆知識
M50 is one of those Messier clusters that rewards careful observation. The red giant near the center, surrounded by blue-white young stars, creates a beautiful color contrast visible even in small telescopes — a visual demonstration of stellar evolution within a single cluster.
コミュニティ写真 (1)
Credit: Chuck Ayoub. License: CC0. (Wikimedia Commons)
Skybred Feb 28, 2026