Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke6007.&link_type=abstract
"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 6007. Bristol: Institute of Physics Publishing, 2001
Astronomy and Astrophysics
Astrophysics
Stars, Stellar Populations And Star Clusters
Scientific paper
M7 is an open or galactic cluster in the constellation Scorpius. It is easily visible with the unaided eye some degrees northeast of Shaula (λ Scorpii) and was first mentioned by Ptolemy in AD 130 (his mention might also include the nearby M6). Hence the cluster is often referred to as `Ptolemy's Cluster'. It was included in the published lists of nebulous and stellar objects by Hodierna (around ...
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