M7 · open cluster

Ptolemy Cluster

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.

RA17h 53m 51sDec−34° 47' 34"

Image: ESO.

Identity & coordinates

Identification

Primary designation: M7
All designations: M7 · NGC 6475 · Ptolemy Cluster
Object type: Open Cluster
Constellation: Scorpius
Best viewing: Summer

Coordinates & physical

Right ascension (J2000): 17h 53m 51s
Declination (J2000): −34° 47' 34"
Apparent magnitude (V): —
Distance: —

III

Visibility tonight

The science

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. The cluster is easily detectable with the naked eye, close to the "stinger" of Scorpius. With a declination of −34.8°, it is the southernmost Messier object.

Summary adapted from Wikipedia · CC-BY-SA-4.0