Double Cluster (h and Chi Persei)

Double Cluster

Double Cluster. Image credit: Michael Fullbright (MSFAstro.net)

The Double Cluster (h and Chi Persei; NGC 869 and NGC 884) consists of two young open clusters that lie close together in the sky in Perseus and are visible to the naked eye on a clear, dark night as a hazy patch of light. Both clusters lie in the Perseus OB1 Association and contain many B stars and M supergiants.


visual magnitude 4.3 (h), 4.4 (Chi)
age (millions of years) 5.6 (h), 3.2 (Chi)
distance (light-years) 7,100 (h), 7,400 (Chi)