Open cluster · constellation Sgr
M 21
NGC 6531M 21MWSC 2796
Catalogue data
- Right ascension
- 18h 04m 13.4s
- Declination
- -22° 29' 24"
- Size
- 6.0′
- Position angle
- not available
- Magnitude
- 5.9 (V)
- Surface brightness
- 18.42 mag/arcsec²(derived)
- Difficulty
- 1/5
- Suggested techniques
- RGB, OSC
- Data source
- OpenNGC
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