Messier 71 (M71, NGC 6838) is a loose globular cluster in the constellation Sagitta. Its star distribution is very loose, but the cluster is much more rich and condensed than typical open clusters. M71 is about 25 light-years in diameter, and lies approximately 12,000 light years distant.
TMB-130SS APO refractor at f/7 on a Losmandy G-11 equatorial mount
SBIG ST-8XM camera
SBIG CFW-10 filter wheel with Astrodon filters
Guiding: 60mm f/5 refractor and ST-402 camera
Imaging and autoguiding with MaxIm DL 4.57
Dark and flat-frame processing in CCDStack
Statistical-combined in CCDStack
Levels, curves, color-combine in Photoshop CS3
|Date and Location||
10 October 2007
Montpelier, VA N 37° 49' 12", W 77° 42' 06"