a Comae Berenicis


Alpha Comae Berenicis is a very close binary of equal 5.1 magnitude stars. Together they form a magnitude of 4.3. The companion's orbit of 25.9 years is seen perfectly on edge.

Alpha Comae is quickly found west of Arcturus (alpha Boötis). Follow the arrow-shaped asterism -- in the same field of view as Arcturus -- which points directly to alpha Comae, two fields of view to the west: binoculars.

The Messier object in the same field of view, M53, is a globular star cluster about 65,000 light years away. It's best seen in large telescopes.


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© 1999-2000 by Richard Dibon-Smith.