M39

Details M39 M39

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke6039.&link_type=abstract

"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 6039. Bristol: Institute of Physics Publishing, 2001

Astronomy and Astrophysics

Astrophysics

Stars, Stellar Populations And Star Clusters

Scientific paper

M39 is a sparse open cluster in Cygnus, and even though Messier independently discovered it in 1764, its visual magnitude of 5.2 and extended size (32 arcmin, larger than the full Moon) makes it likely that it had been observed previously. There are claims that Le Gentil identified it in 1750 but they are doubtful, since he did not leave a good position, and there are suggestions that Aristotle d...

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