NGC 637


NGC 637 is an open cluster of stars in the constellation Cassiopeia. It has a Trumpler classification of I2m and an angular diameter of 4.2′. At a distance of approximately 7,045 light years, this corresponds to a diameter of. The estimated age of this cluster is 5–15 million years.
The cluster was discovered on 9 November 1787 by astronomer William Herschel.