M5 - Globular Cluster in Serpens Caput
From the author of Sizing Up The Universe
Click here for Hertzsprung-Russell diagram.
Click here for blinking RR-Lyrae stars.
01:01 EDT May 18, 2015.
Starlight Express SXV-H9 on 10" RCOS at f/9.
L = 10 min, R = 6 min, G = 6 min, B = 6 min
(unguided 20-second).
Log stretch, Gamma stretch, Unsharp mask.
Click here for Hertzsprung-Russell diagram.
23:03 EDT May 6, 2006.
Starlight Express SXV-H9 on 10" RCOS at f/9.
L = 40 min, R = 9 min, G = 10 min, B = 8 min
(unguided 20-second and 1-minute subexposures).
Log stretch, Unsharp mask.
22:08 EDT June 7, 2005.
Starlight Express SXV-H9 on 10" RCOS at f/9.
L = 9.6 min, R = 5 min, G = 5 min, B = 5 min
(unguided 12-second and 1-minute subexposures).
Log stretch, Unsharp mask.
Animated gif blinks a gamma stretch (0.4) of the luminance for the two images above. The RR-Lyrae stars (and a few hot pixels) are easy to spot.