M40

Details M40 M40

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke6040.&link_type=abstract

"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 6040. Bristol: Institute of Physics Publishing, 2001

Astronomy and Astrophysics

Astrophysics

Stars, Individual Stellar Objects

Scientific paper

M40 is a fluke in Messier's list of nebulous objects since it is a double star in Ursa Major, also known as Winnecke 4. Messier noted its position when he was looking for a nebula reported by Hevelius in the same region (probably because he thought Hevelius might have mistaken this double star for a nebula). Hevelius had described a `supra tergum nebulosa', a nebula above the back (of Ursa Major)...

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