Member Robert Vanberbei captured these stunning images of two favorite summertime deep sky objects: Messier 13 – the Great Globular Cluster in Hercules and Messier 92 another globular in the same constellation.
M13 -the Great Globular Cluster in Hercules. [23:36 EDT Jul 20, 2014. Starlight Express SXV-H9 on 10″ RC at f/9. L = 10 min (best 30 out of 199 twenty-second images), R = 6 min, G = 6 min, B = 6 min Log, Unsharp Mask.]
M92 also in the constellation of Hercules [21:21 EDT Jul 30, 2014.
Starlight Express SXV-H9 on 10″ RC at f/9. L = 63.3 min, R = 6.0 min, G = 6.0in, B = 6.0in (unguided 20-second subexposures). Richardson-Lucy deconv, Log stretch, Unsharp mask. ]
Comparing the two similar globulars M13 & M92
For M13 and M92’s H-R diagrams and more of Bob’s deep sky astrophotography visit his website.
Amateur Astronomers Association of Princeton 