Double Cluster
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Double Cluster |
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Deep Sky Object Chart | Alpha Persei (Mirfak) | Beta Persei (Algol) | More Perseus Stars | M34 | M76 | Double Cluster | NGC 1245 | NGC 1275 | NGC 1499 NGC 869 & 884 are two lovely galactic star clusters, famed among astronomers as the "double cluster" because they lie only half a degree apart in the sky. Both are lovely, moderately compact groups containing several hundred stars; including three red giant stars in NGC 884. The pair of clusters can be detected in binoculars in the northwest part of the constellation, about two thirds of the way from Mirfak to the "W" of Cassiopeia. Small telescopes can do well with these clusters, and larger instruments offer a dazzling view. The apparent alignment of the clusters appears to be an illusion, to some degree; while both groups are in the same general area of the galaxy (some 7000 light years away!), NGC 884 seems to be both older and perhaps a thousand light years beyond it's "neighbor". At these large distances, astronomers have difficulty calculating precise positions. Regardless, this "twin" cluster is one of the true gems of the heavens, and should not be missed this
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