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・ Eta Cancri
・ Eta Canis Majoris
・ Eta Canis Minoris
・ Eta Capricorni
・ Eta Carinae
・ Eta Carinids
・ Eta Cassiopeiae
・ Eta Centauri
・ Eta Cephei
・ Eta Ceti
・ Eta Chamaeleontis
・ Eta Circini
・ Eta Cohen
・ Eta College
・ Eta Columbae
Eta Coronae Borealis
・ Eta Corvi
・ Eta Crateris
・ ETA Creative Arts Foundation
・ Eta Crucis
・ Eta Cygni
・ Eta Delphini
・ Eta Doradus
・ Eta Draconis
・ Eta Eridani
・ ETA Foods Factory
・ Eta Funayama Sword
・ Eta function
・ Eta Gamma Delta
・ Eta Geminorum


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Eta Coronae Borealis : ウィキペディア英語版
Eta Coronae Borealis



Eta Coronae Borealis (η Coronae Borealis, η CrB) is a stellar system that lies approximately 58 light-years away. The primary component is a mid-wide binary, while a brown dwarf component is located at a wide separation.
==Components==
Eta Coronae Borealis has been known since the late 18th century to be a moderate-separation binary. The orbit of the two components takes approximately 42 years, which when combined with the distance to the system makes the two stars fairly easily resolvable with a larger telescope. The two stars have similar physical parameters, though the secondary is slightly cooler than the primary and has approximately 90% of the primary's mass. Possible stable planetary orbits in the habitable zone were calculated for the system in 1996.
A brown dwarf companion was detected in 2001. The source 2MASSW J1523226+301456 in the 2MASS catalogue was identified as having a similar proper motion to the AB binary, and subsequent observations confirmed its relationship to the system. The new component, Eta Coronae Borealis C, was found to have a spectral type of L8. The brown dwarf has a minimum separation of 3600 AU, and considering a cooling age of 1–2.5 gigayears, the brown dwarf has a mass of , or .〔

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