Object: The Double Cluster Camera: Meade DSI-Pro II
Date: 9/21/2006 Lens: Pentax 135mm lens
Total Exposures: R:G:B 40':60':60' Subexposures: 1 minute each
Location: West Boylston, MA
Processing: Description:
NGC 869 and NGC 884
Cataloged 130 B.C. by Hipparcos

The famous double cluster in Perseus was known in antique times (probably even pre-historically), and first cataloged by the Greek astronomer Hipparcos. Both clusters are situated in the Perseus OB 1 association, and also only a few hundred light-years appart, at a distance of over 7000 light years. They are both quite young: h is listed at 5.6, chi at 3.2 million years (Sky Catalog 2000); their hottest main sequence stars are of spectral type B0. They are approaching us at 22 (h) and 21 (chi) km/sec, respectively.