M71 - A Globular Cluster
M71 (NGC 6838) is a loose, low density, globular cluster found in Sagitta (The Arrow). Some early astronomers incorrectly labled it a dense open cluster. It turns out its fairly close (for a globular) at 13000 light years. It shines at magnitude 8.3, and is 7.2' across.
This shot was taken at f/6.3 with the 12" LX200, AO7, and ST-8E CCD from my home dome in Monmouth Oregon on Sept. 7, 2001.
|Luminance||38 min||(sum of RGB data)|
|Red||10 min||5 x 2 min||1x1|
|Green||10 min||5 x 2 min||1x1|
|Blue||18 min||9 x 2 min||1x1|
A synthesized luminance frame was built by adding all frames together, then applying DDP and a touch of sharpening. The original RGB frames were then blurred a bit to smooth them. Photoshop was then used to merge the L and RGB color data.