M 92 Globular Cluster

clic for 60% size 1294 x 1061 (410 kB)

clic for a 100% size center crop 1400 x 1052 (439 kB)


About this Image

According to newer sources, the globular cluster M92 is about 26,000 light years distant, only little more than its brighter apparent neighbor M13. It may be a bit younger than M13 as its turnoff point is shifted to the brighter and bluer end.
A semi-recent estimate of M92's age has given a value of about 14-16 billion years.
Many variables have been discovered in this globular, at least 14 of which are of RR Lyrae type, while one of them is one of the very few eclipsing binaries in globular clusters, of W Ursae Majoris type.
North is up.


Technical Details
Optics

TEC-140 refractor, no flattener at f/7

Mount AP-400 GEM
Camera SBIG STL-11000M at -20C, internal filter wheel
Filters Astronomik LRGB
Date Apr 21, 2006.
Location Wildon/Austria
Sky Conditions mag 5, average transparency, temperature 12 C,
Exposure LRGB= 180:30:30:30 min (10-minute sub-exposures)
all 1x1.
Processing Image aquisition and calibration in Maxim DL 4.15; DDP in ImagesPlus;
Photoshop: curves, color balance, crop, unsharp mask;color noise reduction by Neatimage