Messier 39 (M39) is a large open cluster located in the constellation Cygnus, the Swan.
Messier 39 is located about 9 degrees to the east and a bit north of the bright star Deneb, Alpha Cygni. The cluster’s apparent size is 32 arc minutes, making it larger than the full Moon, which means that M39 is best observed in binoculars and small telescopes at the lowest magnifications.
The cluster has an apparent magnitude of 5.5 and lies at a distance of 824.4 light years from Earth. It has the designation NGC 7092 in the New General Catalogue.
Messier 39 has an estimated age of 200 to 300 million years. All its confirmed members are still on the main sequence, still burning hydrogen in their core, and have yet to evolve into red giants.
Messier 39 is a relatively loose cluster with 30 confirmed members occupying an area about 7 light years in diameter. The cluster is approaching us at 28 km/s.
Messier 39 is classified as either Trumpler type III,2,m or III,2,p. This means that it is detached from the surrounding star field but with no central concentration (III), that the stars in the cluster have a moderate range in brightness (2), and that the cluster is either moderately rich, with 50 to 100 stars (m) or poorly populated (p), with fewer than 50 stars.
--Messier-objects.com
More:
Messier39 - WikipediaMessier39 - Astropixels.comMessier39 - SEDSThis is image #39 in long term project to photograph the complete Messier catalog. Happy with this one,again is not most spectacular object but interesting object, nice colours variation and in a nice star field. RGB each image 300 seconds.
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