NGC 457, Owl Cluster

NGC 457 (the Owl Cluster or the ET Cluster) is an open star cluster in the constellation Cassiopeia. It lies over 7,900 light years away from the Sun. It has an estimated age of 21 million years. The cluster is sometimes referred by amateur astronomers as the Owl Cluster or the ET Cluster (due to its resemblance to the movie character). Two bright stars are magnitude 5 Phi-1 Cassiopeiae and magnitude 7 Phi-2 Cassiopeiae. The cluster contains about 150 stars.

NGC 457, Owl Cluster

Image details:
Telescope: TS 90/600 triplet with 2.5" TS flattener
Mount: Skywatcher HEQ5-Synscan
Camera: Atik one 6.0 @ -10C
Exposure: 10 * 120sec with Baader L, 5 * 120 sec RGB
Date: October 13, 2014.
Software: PixInsight
Calibrationfiles: Dark:No, Bias:Yes (masterbias), Flat:Yes
Bigger version: http://www.astrobin.com/full/128956

 
(c) All photos by Ruud de Vries