Instrument

12.5" RCOS @  ~f/9 (2880 mm fl) 0.643 arcsec / pixel.  Shown resampled to 1.10 arcsec / pixel.

Mount

Paramount ME

Camera

SBIG STL-11000 w/ internal filter wheel, AstroDon Filters

Acquisition Data

5/30/2009 to 6/3/2009  Chino Valley, AZ

Exposure

Lum    100 min (10 x 10 min, bin 1x1)

Red       50 min ( 5 x 10 min, bin 1x1)

Green    50 min ( 5 x 10 min, bin 1x1)

Blue      50 min ( 5 x 10 min, bin 1x1)

Software

CCDSoft, CCDStack, Photoshop CS w/ the Fits Liberator plugin, Noel Carboni's actions and Russ Croman's Gradient Exterminator

CCDStack to register, normalize, data reject and combine sub exposures.

PhotoShop for the color combine and luminance sharpening.

Comment

North is to the top.

M107 is a very loosely packed globular cluster in the constellation Ophiuchus. It was discovered by Pierre Méchain in April 1782 and independently by William Herschel in 1793. M107 is close to the galactic plane, at a distance of about 20,900 light-years from Earth. There are 25 known variable stars in this cluster.

Source: Wikipedia