Deep sky · Open cluster in Scorpius · M 7 · NGC 6475
M 7
Ptolemy's Cluster
Ptolemy’s Cluster, recorded as a nebula in AD 130 — one of the earliest deep-sky objects in any catalogue.
- Type
- Open cluster
- Designations
- M 7 · NGC 6475
- Constellation
- Scorpius
- Apparent magnitude
- 3.3
- Apparent size
- 80′
- Position (J2000)
- RA 17h 54m · Dec −34° 48′
Look for
It is large and bright, near the tip of the Scorpion’s tail. Binoculars show dozens of stars against the dense Milky Way.