NGC 457 (also designated Caldwell 13, and known as the Dragonfly Cluster, E.T. Cluster, Owl Cluster, Kachina Doll Cluster or Phi Cassiopeiae Cluster)[2] is an open star cluster in the constellationCassiopeia.
It was discovered by William Herschel on August 18, 1780, with a 6.2 inch reflector telescope, and catalogued as VII 42.[3]
Visibility
It is an easy target for amateur astronomers, and can be seen even with small telescopes in light-polluted skies.
Characteristics
It 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[4] or the E.T. Cluster (due to its resemblance to the movie character). Two bright stars Phi Cassiopeiae (magnitude 5 and spectral type F0) and HD 7902 (magnitude 7) can be imagined as eyes. It is not yet clear if Phi Cassiopeiae is a member of the cluster, and if it is, then it would be one of the brightest stars known, surpassing Rigel in luminosity. For comparison, the Sun at the same distance as Phi Cassiopeiae would shine at just 17.3 magnitudes. The next brightest star is the red supergiantvariable star V466 Cassiopeiae. The cluster features a rich field of about 150 stars of magnitudes 9-13. About 60 stars have been identified as true members of the cluster.
Gallery
Map showing the location of NGC 457 in the constellation of Cassiopeia.
NGC 457 (center) pictured alongside open cluster NGC 436 (bottom right).
References
^ abFrinchaboy, 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 (1): 118–145. arXiv:0804.4630. Bibcode:2008AJ....136..118F. doi:10.1088/0004-6256/136/1/118. S2CID 16641439. See table I, p. 12.
NGC 457 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
May 01, 2023
also, designated, caldwell, known, dragonfly, cluster, cluster, cluster, kachina, doll, cluster, cassiopeiae, cluster, open, star, cluster, constellation, cassiopeia, open, cluster, cassiopeiaobservation, data, j2000, epoch, right, ascension01h, 6sdeclination,. NGC 457 also designated Caldwell 13 and known as the Dragonfly Cluster E T Cluster Owl Cluster Kachina Doll Cluster or Phi Cassiopeiae Cluster 2 is an open star cluster in the constellation Cassiopeia NGC 457Open cluster NGC 457 in CassiopeiaObservation data J2000 0 epoch Right ascension01h 19m 32 6sDeclination 58 17 27 Distance7 922 kly 2 429 1 kpc Apparent magnitude V 6 4Apparent dimensions V 13 0 Physical characteristicsOther designationsOwl Cluster E T Cluster Caldwell 13 Cr 12 Mel 7 OCL 321 Lund 43 H VII 42 h 97 GC 256 AssociationsConstellationCassiopeiaSee also Open cluster List of open clusters Contents 1 Discovery 2 Visibility 3 Characteristics 4 Gallery 5 References 6 External linksDiscovery EditIt was discovered by William Herschel on August 18 1780 with a 6 2 inch reflector telescope and catalogued as VII 42 3 Visibility EditIt is an easy target for amateur astronomers and can be seen even with small telescopes in light polluted skies Characteristics EditIt 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 4 or the E T Cluster due to its resemblance to the movie character Two bright stars Phi Cassiopeiae magnitude 5 and spectral type F0 and HD 7902 magnitude 7 can be imagined as eyes It is not yet clear if Phi Cassiopeiae is a member of the cluster and if it is then it would be one of the brightest stars known surpassing Rigel in luminosity For comparison the Sun at the same distance as Phi Cassiopeiae would shine at just 17 3 magnitudes The next brightest star is the red supergiant variable star V466 Cassiopeiae The cluster features a rich field of about 150 stars of magnitudes 9 13 About 60 stars have been identified as true members of the cluster Gallery Edit Map showing the location of NGC 457 in the constellation of Cassiopeia NGC 457 center pictured alongside open cluster NGC 436 bottom right References Edit a b 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 1 118 145 arXiv 0804 4630 Bibcode 2008AJ 136 118F doi 10 1088 0004 6256 136 1 118 S2CID 16641439 See table I p 12 The Dragonfly Cluster Open Cluster Retrieved 2020 10 28 NGC 457 Owl Cluster E T Deep Sky Corner www deepskycorner ch Retrieved 2022 05 28 NGC 457 Astronomy Magazine Retrieved 2020 10 13 External links Edit Media related to NGC 457 at Wikimedia Commons NGC 457 on SEDS NGC 457 on WikiSky DSS2 SDSS GALEX IRAS Hydrogen a X Ray Astrophoto Sky Map Articles and images Retrieved from https en wikipedia org w index php title NGC 457 amp oldid 1152519815, wikipedia, wiki, book, books, library,
