Globular cluster in Sagittarius

This cluster is about 18,000 light years away, and it has a diameter of about 30 light years.  It is just 3 degrees to the west of the much larger and brighter globular cluster Messier 22.  The smaller apparent size of this cluster is partly due to its greater distance.   Both clusters are situated in the Sagittarius Milky Way, so the background is filled with countless stars.  Messier 28 is easy to spot with a small telescope, appearing as a hazy ball of light.  With a medium or large telescope, many of its individual stars can be resolved.

Magnitude 7.7
Apparent Size 11'
Distance (light yrs) 17,900
Right Ascension 18:24.5
Declination -24 52
Field of View 22.5' x 15'

Image details:  12 images, each 90 seconds at ISO 800, taken with a Canon 400D camera through a Meade 12” telescope at f/10.

August 2008