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Rigil Kentaurus

HIP 71681; Alpha2 Cen

Estrela Dupla Observável Espetacular (80/100)

Sep: 8.1", Companion: mag 1.3

HIP 71681; Alpha2 Cen DoubleStar Cen Visível Nível 2 Small telescope (4") - Requires steady seeing
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Propriedades Físicas

Magnitude 1.33
Tipo Espectral K1V
Cor da Estrela Laranja (B-V 0.88)
Temperatura 5794 K
Raio 1.3 R☉
Distância 4.4 ly

Posição e Identificadores

RA 14h 39m 36.1s
Dec -60° 50' 08.0"
Constelação Cen
HR 5460
HIP 71681
Bayer Alpha2

Visibilidade

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Sistema Estelar Múltiplo

Componentes 3
IDs dos Componentes AB
Separação 8.1″
Mag da Companheira 1.3
Espectro da Companheira K1V
Ângulo de Posição 5°
Cores das Estrelas A: Laranja B: Laranja
Descobridor RHD 1

Vista pela Ocular

80x Dawes: 1.9″ TFOV: 0.6°
Realista = tamanho angular verdadeiro
N E 5° A (1.3) B (1.3)

Sep: 8.1″ · PA: 5° · 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

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Espectro de corpo negro

Espectro de absorção estelar

Espectro de absorção simulado com base no tipo espectral. Passe o mouse sobre as linhas para identificar os elementos.

Notas Estelares

See HR 5459.
0.750".

Imagem de Levantamento

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Sobre Rigil Kentaurus

Descrição

Alpha Centauri B (Rigil Kentaurus B) is the fainter component of the Alpha Centauri binary, an orange main-sequence star of spectral type K1V at magnitude 1.33. At 4.37 light-years, it is part of the nearest star system to Earth. It is slightly smaller, cooler, and less luminous than the Sun, with about 50% of solar luminosity.

Dicas de Observação

Alpha Centauri B is easily resolved from the brighter A component in a small telescope — the pair currently has a separation of several arcseconds. Look for the slightly orange companion next to the golden primary. The orbital period is about 80 years, and the separation varies between 2 and 22 arcseconds. Not visible north of about 29°N.

História

Alpha Centauri B has the same naming history as its primary. In 2012, a planet candidate (Alpha Centauri Bb) was announced orbiting this star, generating worldwide excitement as the nearest exoplanet, but subsequent analysis showed the detection was likely a statistical artifact. The search for planets in this system continues.

Curiosidades

Alpha Centauri B experiences significantly different seasons and day lengths than Earth due to the gravitational influence of its binary companion. From a hypothetical planet orbiting B, Alpha Centauri A would appear as an extremely bright star (about magnitude -21), roughly 200 times brighter than our full Moon.