Owl Cluster
NGC 457
Propriedades
Posição e Identificadores
Visibilidade
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Sobre Owl Cluster
Descrição
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.
Dicas de Observação
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.
História
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.
Curiosidades
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.
Fotos da Comunidade (1)
Credit: Chuck Ayoub. License: CC0. (Wikimedia Commons)
Skybred Mar 2, 2026