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Owl Cluster

NGC 457

산개성단 우수 (70/100)
C13 OpenCluster Cassiopeia 관측 가능 난이도 1 Naked eye / Binoculars - Wide field preferred
Credit: Chuck Ayoub. License: CC0. (Wikimedia Commons)
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특성

등급 6.4
각크기 7.8′
거리 7900 ly
Open Cluster [Distance: 7900 ly]

위치 & 식별자

RA 01h 19m 30.0s
Dec +58° 19' 58.8"
별자리 Cassiopeia
카탈로그 C13

가시성

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Owl Cluster 소개

설명

The Owl Cluster (NGC 457) is a bright open cluster in Cassiopeia, about 7,900 light-years away. It features two bright stars that form the "eyes" of an owl with wings spread, giving it its popular name. The cluster spans about 13 arcminutes.

관측 팁

One of the most delightful open clusters for beginners. Even a small telescope reveals the owl pattern clearly. The bright star Phi Cassiopeiae marks one eye. Best at 40-60x to frame the entire figure. Circumpolar and best in autumn.

역사

Discovered by William Herschel in 1787. Also known as the E.T. Cluster because some observers see the outline of the movie character E.T. instead of an owl.

재미있는 사실

Whether Phi Cassiopeiae (the bright yellow star forming one eye) is actually a cluster member or a foreground star is debated. If it is a member, it would be one of the most luminous supergiants known.

커뮤니티 사진 (1)

Credit: Chuck Ayoub. License: CC0. (Wikimedia Commons)

Credit: Chuck Ayoub. License: CC0. (Wikimedia Commons)

Skybred Mar 2, 2026