NGC 457 Or Owl Cluster An Open Cluster In Cassiopeia Stock Image

NGC 457 (also known as the Owl Cluster, the ET Cluster, or Caldwell 13) is an open star cluster in the constellation Cassiopeia. It is 7,900 light years away from us. It has an estimated age of 21 million years. The cluster is sometimes referred by amateur astronomers as the Owl Cluster and the ET Cluster. Two bright stars, magnitude 5 Phi-1 Cassiopeiae and magnitude 7 Phi-2 Cassiopeiae can be imagined as eyes of the owl. The cluster features a rich field of about 150 stars of magnitudes 12-15. 12 December 2015, LRGB image, total exposure 60 minutes. SBIG STT-8300 CCD Camera, Takahashi CCA-250 Astrograph, 1,250 mm f/5, Astro-physics 1200 GTO mount. From Pakchong, Nakornratchasima, Thailand