出典:Wikipedia
出典:『Wikipedia』 (2011/07/13 21:51 UTC 版)
NGC 188 (also Caldwell 1) is an open cluster in the constellation Cepheus. It was discovered by John Herschel in 1825. Unlike most open clusters that drift apart after a few million years because of the gravitational interaction of our galaxy, NGC 188 lies far above the plane of the galaxy and is one of the most ancient of open clusters. It is one of the older known open clusters.