Open Cluster in Sagittarius

Messier 25 is a nice bright open cluster. It can be seen with the naked eye under dark skies as a small fuzzy spot. Its location in the rich star fields of the Sagittarius Milky Way is shown in this wide-field view. An ordinary pair of binoculars reveals many of the cluster's individual stars. Because of its large apparent size, telescopic views are best at low power.

Magnitude 4.6
Apparent Size 30'
Distance (light yrs) 2,300
Right Ascension 18:31.7
Declination -19 07
Field of View 35' x 26'

Image details:  Exposure times of 12 minutes luminance and 6 minutes each of red, green and blue, taken with an SBIG ST-8300M imager and a 12" Meade telescope at f/5.6.

August 2013