Double Cluster (h and Chi Persei; NGC 869 and NGC 884)
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)|