Open cluster · constellation Sco
M 6
Butterfly Cluster
NGC 6405M 6MWSC 2661
Catalogue data
- Right ascension
- 17h 40m 20.8s
- Declination
- -32° 15' 15"
- Size
- 15.6′
- Position angle
- not available
- Magnitude
- 4.2 (V)
- Surface brightness
- 18.79 mag/arcsec²(derived)
- Difficulty
- 1/5
- Suggested techniques
- RGB, OSC
- Data source
- OpenNGC
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