M15: A globular cluster in
Pegasus
M15 is an old globular cluster, a collection of a hundred thousand low-metallicity stars, 30000 light years away.
Images taken: Nov. 6, 2007.
Students: Colin Reed and Brent Ross
Telescope: Meade 12 in with f/5.9 focal reducer (f=71in).
Size of the images: 20'x30'; rescaled to 1 as/pixel; North is up.
Camera: SBIG ST-10 CCD
Exposures: 4 x 5 min red, 4 x 5 min green, 4 x 5 min blue.
Image processing: CCDoops + CCDSoft + CCDSharp + Photoshop CS.