出典:Wikipedia
出典:『Wikipedia』 (2011/04/29 05:08 UTC 版)
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 9.8 light-years (3.0 pc). The estimated age of this cluster is 5–15 million years.