Zuben Elgenubi
HIP 72622; Alpha2 Lib; 9 Lib
Sep: 230.8", Companion: mag 5.2
Propriedades Físicas
Posição e Identificadores
Visibilidade
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Sistema Estelar Múltiplo
Vista pela Ocular
Sep: 230.8″ · PA: 314° · N cima, L esquerda
Resolvido · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 3.1″
Comparação de Tamanho
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Classificação Espectral
Diagrama Hertzsprung-Russell
Espectro de corpo negro
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Notas Estelares
Imagem de Levantamento
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Sobre Zuben Elgenubi
Descrição
Zuben Elgenubi is a wide double star system at magnitude 2.75 in Libra, the second brightest star in the constellation. A white subgiant of spectral type A3IV, located about 77 light-years from Earth. A telescope reveals a fainter companion (magnitude 5.2) about 231 arcseconds away, making it one of the widest bright double stars in the sky.
Dicas de Observação
Zuben Elgenubi is the more southerly of Libra's two main stars, forming the southern pan of the Scales with Zuben Elschemali to the north. The wide companion is visible in binoculars. The pair lies between Virgo and Scorpius on the ecliptic. Best observed May through July.
História
The name Zuben Elgenubi comes from the Arabic 'al-zuban al-janubi,' meaning 'the southern claw,' from when Libra's stars were considered part of Scorpius. The Romans separated them into Libra, the only zodiacal constellation representing an inanimate object.
Curiosidades
The ecliptic passes very close to Zuben Elgenubi, making it one of the most frequently occulted bright stars. The Moon and planets regularly pass over it, and it has been used to study the lunar limb profile during occultations.