NGC 457

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NGC 457

Observation data (J2000.0 epoch)
Constellation	Cassiopeia
Right ascension	01^h 19^m 32.6^s
Declination	+58° 17′ 27″
Distance	7.922 kly (2.429^[1] kpc)
Apparent magnitude (V)	6.4^[2]
Apparent dimensions (V)	13.0′^[2]
Physical characteristics
Mass	- M_☉
Other designations	Cr 12, Mel 7, OCL 321, Lund 43, H VII-42, h 97, GC 256,^[2] Caldwell 13, Owl Cluster, ET Cluster
See also: Open cluster, List of open clusters

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.^[2] and lies over 7,900 light years away from the Sun. It has an estimated age of 21 million years.^[1] The cluster is sometimes referred by amateur astronomers as the Owl Cluster, Kachina Doll Cluster,^[2] 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. The cluster features a rich field of about 150 stars of magnitudes 12-15.^[2]

References

↑ 1.0 1.1 Frinchaboy, Peter M.; et al. (2008). "Open Clusters as Galactic Disk Tracers. I. Project Motivation, Cluster Membership, and Bulk Three-Dimensional Kinematics". The Astronomical Journal 136: 118–145. arXiv:0804.4630. Bibcode:2008AJ....136..118F. doi:10.1088/0004-6256/136/1/118. Cite uses deprecated parameters (help) See table I, p. 12.
↑ 2.0 2.1 2.2 2.3 2.4 2.5 "NGC 457". The NGC/IC Project Database. Retrieved 2012-05-09.

External links

NGC 457 at SEDS

NGC 457 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images

v t e Caldwell catalogue

List	C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 C17 C18 C19 C20 C21 C22 C23 C24 C25 C26 C27 C28 C29 C30 C31 C32 C33 C34 C35 C36 C37 C38 C39 C40 C41 C42 C43 C44 C45 C46 C47 C48 C49 C50 C51 C52 C53 C54 C55 C56 C57 C58 C59 C60 C61 C62 C63 C64 C65 C66 C67 C68 C69 C70 C71 C72 C73 C74 C75 C76 C77 C78 C79 C80 C81 C82 C83 C84 C85 C86 C87 C88 C89 C90 C91 C92 C93 C94 C95 C96 C97 C98 C99 C100 C101 C102 C103 C104 C105 C106 C107 C108 C109

See also	Messier Catalogue Catalogue of Nebulae and Clusters of Stars New General Catalogue Index Catalogue Revised New General Catalogue Herschel 400 Catalogue

Book:Caldwell catalogue Category:Caldwell objects Portal:Astronomy Commons:Caldwell objects

v t e New General Catalogue 1 to 499

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Astronomical catalog List of NGC objects

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