Elnath
HIP 25428; Beta Tau; 112 Tau
Sep: 33.8", Companion: mag 2.4
Propriedades Físicas
Posição e Identificadores
Visibilidade
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Sistema Estelar Múltiplo
Vista pela Ocular
Sep: 33.8″ · PA: 238° · N cima, L esquerda
Resolvido · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 3.1″
Comparação de Tamanho
Ciclo de vida estelar
Classificação Espectral
Diagrama Hertzsprung-Russell
Espectro de corpo negro
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Notas Estelares
Imagem de Levantamento
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Sobre Elnath
Descrição
Elnath (Beta Tauri) is the second brightest star in Taurus at magnitude 1.65, located about 134 light-years from Earth. It is a blue-white giant of spectral type B7III, about 4.5 times the mass of the Sun and 700 times more luminous. Elnath marks the tip of the northern horn of Taurus the Bull. It lies very close to the galactic anticenter — the point in the sky directly opposite the center of the Milky Way.
Dicas de Observação
Elnath is shared visually between Taurus and Auriga, sitting at the boundary where the Bull's horn meets the Charioteer's foot. It serves as a useful guide star — the supernova remnant M1 (Crab Nebula) lies about 1 degree to its northwest, and the open clusters of Auriga (M36, M37, M38) are nearby. Its blue-white color is evident to the naked eye. Best observed from November through March.
História
The name Elnath comes from the Arabic 'al-Natih' meaning 'the butting one,' referring to the tip of the bull's horn. Historically, the star was shared between the constellations Taurus and Auriga and carried the dual designation of Beta Tauri and Gamma Aurigae. In 1930, when the IAU formalized constellation boundaries, it was officially assigned to Taurus.
Curiosidades
Elnath is one of the few bright stars that was reassigned between constellations when modern boundaries were drawn. Its position near the galactic anticenter means that when you look at Elnath, you are looking outward through the disk of the Milky Way, away from the galactic center in Sagittarius.