Alt. Designations: NGC 6809
Object Type: Globular Cluster
Constellation: Sagittarius
Distance: 17.3 kly
Right Ascension: 19h 39m 59.4s
Declination: -30° 57´ 42"
Visual Magnitude: 7
Apparent Dimension: 19.0´ Dia.
Best Month To View: Jun

Another fine globular cluster to be found in Sagittarius is M55. This is a large cluster with a somewhat loose arrangement of stars. Its apparent size is about 2/3 that of the full moon. It has a diameter of about 110 light-years, and is believed to be located only 20,000 light-years from Earth. This would make it among the closest of the globular clusters. M55 has been described as very grainy in appearance, due to its loose structure. Its size and brightness make it easy to identify in binoculars. Through a small telescope, its grainy structure will be more apparent.