Messier 50 (M50), nicknamed the Heart-Shaped Cluster, is a large, bright open cluster located in the constellation Monoceros.
The cluster has an apparent magnitude of 5.9 and lies at an approximate distance of 3,200 light years from Earth. It has the designation NGC 2323 in the New General Catalogue.
Messier 50 lies to the east of Orion, near the border between Monoceros and Canis Major constellation. It occupies an area about half the size of the full Moon and is relatively easy to find because it is located 9.5 degrees north-northeast of Sirius, the brightest star in the sky.
M50 can be found about 20 degrees along the line formed by the three bright stars of Orion’s Belt. It can be found about two fifths of the way from Sirius to Procyon, the brightest star in Canis Minor constellation and eighth brightest star in the sky.
At least two or three relatively bright stars in M50 can be resolved in binoculars, while small telescopes reveal the cluster’s distinctive heart-shaped figure. 6-inch and 8-inch telescopes show at least 40 of the cluster’s blue-white stars, as well as some yellow and orange stars. The best time of year to observe M50 is in the months of December, January and February.
Messier 50 has an angular diameter of about 15 by 20 arc minutes, corresponding to a spatial diameter of 20 light years. The dense core of the cluster spans only 10 arc minutes or 10 light years. M50 has an estimated age of 78 million years, which makes it a very young cluster. It is composed of many young, hot, luminous blue stars. It also contains several yellow giants and a red M-class giant, which is positioned 7 arc minutes south of the cluster’s centre.
Messier 50 was possibly discovered by the Italian astronomer and mathematician Giovanni Domenico Cassini before 1711 based on a report by Jacques Cassini, his son, in his book Elements of Astronomy (1740).
Charles Messier discovered the cluster independently and catalogued it on April 5, 1772. He noted, “I determined, in the same evening, the position of a cluster of small stars placed between the star Theta in the ear of Canis Major, & the right loins of Monoceros; I compared this cluster with the telescopic star, determined on April 3, & this one with a star of the seventh magnitude which was near the cluster.”
William Herschel observed M50 on March 4, 1785 and described the object as a “very brilliant cluster of large stars, considerably compressed and rich, above 20′ in diameter, the stars of various sizes, visible in the finder.“
--Messier-objects.com
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Messier50 - WikipediaMessier50 - Astropixels.comMessier50 - SEDSThis is image #32 in long term project to photograph the complete Messier catalog. Really happy with this one, is not most spectacular object but interesting object in a nice star field. RGB each image 300 seconds.
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