M25 = IC4725 ( 18h 31.6m -19°15´, 4.6 mag. )
This open star cluster in Sagittarius was first noticed by deCheseaux in 1746 and Messier observed it on June 20, 1764. It is about 2,300 ly away and measures 20 ly across. One of its bright members is U Sgt - a classical cepheid with a period of 6.75 days. M25 stands out in binoculars almost 5° S of g Scuti (see finder chart below).
The above image was taken on June 14, 1999 from Sooke, BC. Cookbook 245 LDC CCD camera was used on Celestron Ultima 8 f3.0 telescope autoguided with Cookbook 211 LDC CCD camera on piggybacked 500mm f8 telephoto lens. It is composed of six white exposures (120 sec. each) and cyan, magenta and yellow-filtered integrations (3 x 120 sec. each) processed with AIP4WIN software and adjusted in Lab color model with Corel PhotoPaint 8.
North is to the right.
Map created in Guide 7.0 - 7°45' x 7°45'. North is up.
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© Jan Wisniewski