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NGC 457 E.T. Cluster .jpg

mariosi
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NGC 457 
Constellation Cassiopeia
Right ascension 01h 19m 32.6s
Declination +58° 17′ 27″
Distance 7.922 kly (2.429 kpc)
Apparent magnitude (V) 6.4
Apparent dimensions (V) 13.0′

NGC 457 (also known as the Owl Cluster, the ET Cluster, or Caldwell 13) is an open star cluster in the constellation Cassiopeia. It was discovered by William Herschel in 1787,and 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, Kachina Doll Cluster,the ET Cluster (due to its resemblance to the movie character) or the "Skiing Cluster". Two bright stars, magnitude 5 Phi-1 Cassiopeiae and magnitude 7 Phi-2 Cassiopeiae can be imagined as eyes(Wikipedia).

DAY: Friday    DATE: 7/10/16     TIME: 02:00
SCOPE: Dob Sky- Watcher 10px F.L.1200/f4.7 
EYEPIECE: T/S 30mm plossl 2inches F.O.V.68°
LOCATION: Mammari

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