201409_OkieTex -- dblclstr_1a.jpg

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The Double Cluster (also known as Caldwell 14) is the common name for the naked-eye open clusters NGC 869 (right) and NGC 884 (left), which are close together in the constellation Perseus. NGC 869 and NGC 884 both lie at a distance of 7500 light years. The clusters are blueshifted, with NGC 869 approaching Earth at a speed of 39 km/s (24 mi/s) and NGC 884 approaching at a similar speed of 38 km/s (24 mi/s).