M21 NGC 6531
Constellation: Sagittarius
R.A.: 18h04m13.0s
Dec.: -22°29'24"
Magnitude: 7.20
Distance: 3900 ly
Type: Open Cluster
Imaging Location: Didsbury AB Canada
Imaging Platform: Equinox 80 QSI540
Mount: EQ6
Guiding Setup: SSAG Equinox 120
Exposure: 2x300 LRGB
Date: 2009-09-16
Software: MaximDL, Images Plus, PHD, Photoshop CS3 Pixinsight