Location: Warrumbungle Observatory, Australia (149 11 E, 31 16 S)
Date: 27 August 2011
Camera: SBIG ST-10xme
Telescope: William Optics M120
Frames: ten 120 second exposures for each of RGB. Synthetic luminance from RGB data.
Processing: Stacked in CCDStack, balanced, curves, highlights, smart sharpened and diffraction spikes added in
Text from APOD: Many stars like our Sun were formed in open
clusters. The above pictured open cluster, M25, contains thousands of stars and is about two thousand light
years distant. The stars in this cluster all formed together about 90 million years ago. The bright young stars
in M25 appear blue. Open clusters, also called galactic clusters, contain fewer and younger stars than globular
clusters. Also unlike globular clusters, open clusters are generally confined to the plane of our Galaxy. M25 is
visible with binoculars towards the constellation of the Archer ( Sagittarius).