Globular Cluster M 5

 

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About this Image

The globular cluster M 5 in the constellation Serpens is often overseen in comparison the famous M 13 cluster. It is situated approx. 25.000 light-years away. The cluster extends 23 arc min, one of the biggest apparent clusters in the sky.

M5 contains the considerably large number of more than 105 known variable stars with a period of a few hours to a few days. Many of these are of type RR Lyrae
North is to the bottom right.

Find more literature on the variable stars 1.
Find a highly resolved Hubble image of M 5 here 2.

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Technical Details
Optics

16 " cassegrain in secondary focus at f/10

Mount MK100 GEM
Camera SBIG STL-11000M at -15C, 8-pos STL filter wheel
Filters Baader LRGB
Date June 18, 2009
Location Wildon/Austria
Sky Conditions Mag 5.5 skies, raw FWHM 1.9-2.5" temperature 15 C,
Exposure L:R:G:B = 60:40:40:40 min (5 min L, 20 min RGB sub-exposures);
all 1x1.
Programs used Maxim DL 4.5;
CCDStack
Photoshop CS3