Deep sky · Open cluster in Scorpius · M 6 · NGC 6405
M 6
Butterfly Cluster
The Butterfly Cluster, near the Scorpion’s sting — its stars trace two open wings.
- Type
- Open cluster
- Designations
- M 6 · NGC 6405
- Constellation
- Scorpius
- Apparent magnitude
- 4.2
- Apparent size
- 25′
- Position (J2000)
- RA 17h 40m · Dec −32° 15′
Look for
With M 7 nearby, it is one of two bright clusters visible to the eye by the Scorpion’s tail; Ptolemy recorded M 7 in AD 130.