HD 88133

HD 88133
Dados observacionais (J2000)
Constelação Leo
Asc. reta 10h 10m 07,7s[1]
Declinação +18° 11′ 12,7″[1]
Magnitude aparente 8,06[1]
Características
Tipo espectral G5 IV[1]
Cor (B-V) 0,81[2]
Astrometria
Velocidade radial -3,53 km/s[1]
Mov. próprio (AR) -12,58 mas/a[1]
Mov. próprio (DEC) -264,57 mas/a[1]
Paralaxe 12,28 ± 0,88 mas[1]
Distância 270 ± 20 anos-luz
81 ± 6 pc
Magnitude absoluta 3,65[2]
Detalhes
Massa 1,2 ± 0,2[2] M☉
Raio 1,93 ± 0,06[2] R☉
Gravidade superficial 4,23 ± 0,05 (log g)[2]
Temperatura 5 494 ± 23[2] K
Metalicidade [Fe/H] 0,34 ± 0,04[2]
Rotação 2,2 ± 0,3 km/s (48 dias)[2]
Idade 9,56 bilhões[3] de anos
Outras denominações
BD+18°2326, GC 13963, HIP 49813, SAO 98978.[1]

HD 88133 é uma estrela subigante amarela na constelação de Leo. Com uma magnitude aparente de 8,06,[1] não é visível a olho nu. A distância a esta estrela, determinada a partir de medições de paralaxe, é de aproximadamente 270 anos-luz (81 parsecs).[1]

HD 88133 tem uma classificação estelar de G5 IV.[1] A parte 'G5' indica que é uma estrela intermediária de classe G, parecida com o Sol, que é um pouco mais quente com classe G2. O sufixo 'IV' indica que, a uma idade avançada de 9,56 bilhões de anos,[3] já passou pela sequência principal e evoluiu para uma estrela subgigante, que terminou ou está terminando o consumo de hidrogênio em seu núcleo para então tornar-se uma estrela gigante. É maior que o Sol, com uma massa de 1,2 massas solares e um raio de 1,93 raios solares.[2]

Em 2004, foi descoberto por velocidade radial um planeta da massa de Saturno orbitando HD 88133.[2]

O sistema HD 88133 [4]
Planeta Massa
 Semieixo maior
(UA)
 Período orbital
(dias)
 Excentricidade
b >0,229 ± 0,033 MJ
 0,0472 ± 0,0027
 3,41587 ± 0,00059
 0,133 ± 0,072

Ver também

Referências

  1. ↑ a b c d e f g h i j k l «SIMBAD query result - G 43-30». SIMBAD. Centre de Données astronomiques de Strasbourg. Consultado em 11 de dezembro de 2012 
  2. ↑ a b c d e f g h i j Butler, R. P.; et al. (fevereiro de 2005). «The N2K Consortium. I. A Hot Saturn Planet Orbiting HD 88133». The Astrophysical Journal. 620 (1). pp. 481–486. Bibcode:2005ApJ...620..481F. arXiv:astro-ph/0607493Acessível livremente. doi:10.1086/426810 
  3. ↑ a b «Planet HD 88133 b». The Extrasolar Planets Encyclopaedia. Consultado em 11 de dezembro de 2012 
  4. ↑ Butler, R. P.; et al. (julho de 2006). «Catalog of Nearby Exoplanets». The Astrophysical Journal. 646 (1). pp. 505–522. Bibcode:2006ApJ...646..505B. doi:10.1086/504701 

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