M39
M39 (or NGC 7092 ) is a open Amas located in the Constellation of the Cygne. He was discovered by Charles Messier in 1764.
This cluster is relatively loose, including/understanding about thirty star S approximately in a volume of 7 light-years of diameter, it is located roughly at 825 light-years of the Solar system, approaching some at the speed of 28 km/s. the estimated age of M39 ranges between 230 and 300 million years.
The most brilliant star of M39 is of spectral Type A0, with a Magnitude connect of +6,83. The whole of stars observed in this cluster seems to belong to the principal sequence of the Diagramme of Hertzsprung-Russell, some of them being in extreme cases of the passage in phase of Géante red.
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