The Ptolemy Cluster, catalogued as Messier 7 and also designated NGC 6475, is an open star cluster in the constellation Scorpius, close to the tail's stinger, and is easily seen with the naked eye. At a declination of about minus 34.8 degrees it is the southernmost object in Messier's catalogue.
Facts
Discovery YearPtolemy recorded it as a nebula in 130 AD, an ancient sighting rather than a modern discovery date Classification
Constellation In the Other Atlases
In Constellation
Also in Divinity Atlas: the constellation this subject lies in.
Sources
1. Wikipedia (space and spaceflight articles)
Wikimedia Foundation
2. Messier 7
Introduction
is an open cluster of stars in the constellation of Scorpius
Observations
who described it as a nebula in 130 AD
Introduction [alias-also-known-as]
also designated NGC 6475
Ptolemy Cluster, Wikipedia - lead section, catalogue classification
Messier 7 or M7, also designated NGC 6475 and sometimes known as Ptolemy's Cluster, is an open cluster of stars in the constellation of Scorpius.
Messier 7, Wikipedia - lead section, constellation
Messier 7 or M7, also designated NGC 6475 and sometimes known as Ptolemy's Cluster, is an open cluster of stars in the constellation of Scorpius.
In Group: Open Clusters, Lead sentence
Messier 7 or M7, also designated NGC 6475 and sometimes known as Ptolemy's Cluster, is an open cluster of stars in the constellation of Scorpius.
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