Messier 39
Template:Short description Template:Infobox Cluster
Messier 39 or M39, also known as NGC 7092, is an open cluster of stars in the constellation of Cygnus, sometimes referred to as the Pyramid Cluster. It is positioned two degrees south of the star Pi Cygni[1] and around 9° east-northeast of Deneb.[2] The cluster was discovered by Guillaume Le Gentil in 1749, then Charles Messier added it to his catalogue in 1764.[1][3] When observed in a small telescope at low power the cluster shows around two dozen members[1] but is best observed with binoculars.[1] It has a total integrated magnitude (brightness) of 4.6 and spans an angular diameter of Script error: No such module "val".[4] – about the size of the full Moon.[2] It is centered about Script error: No such module "convert". away.[5]
This cluster has an estimated mass of Script error: No such module "val". and a linear tidal radius of Script error: No such module "val"..[6] Of the 15 brightest components, six form binary star systems; one more is suspected. HD 205117 is a probable eclipsing binary system with a period of 113.2 days that varies by 0.051 in visual magnitude. Both members seem to be subgiants.[7] Within are at least five[8] chemically peculiar stars and ten[9] suspected short-period variable stars.
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References
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External links
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