Alt. Designations: NGC 7092
Object Type: Open Cluster
Constellation: Cygnus
Distance: 0.825 kly
Right Ascension: 21h 31m 42.0s
Declination: +48° 25´ 00"
Visual Magnitude: 4.6
Apparent Dimension: 31.0´ Dia.
Best Month To View: Jul

Located in the constellation Cygnus, M39 is a very loose cluster of about 30 stars. It lies only 800 light-years from Earth, which makes it one of the closest open clusters in the sky. The cluster has a diameter of about 7 light-years, and is believed to be over 250 million years old. With a visual magnitude of 5.2, it is a bright cluster although very loosely populated. This cluster is an easy target for binoculars and is best observed in telescopes at low power.