HD 81040

HD 81040
Dados observacionais (J2000)
Constelação Leo
Asc. reta 09h 23m 47,1s[1]
Declinação +20° 21′ 52,0″[1]
Magnitude aparente 7,730[1]
Características
Tipo espectral G0 V[1]
G2/G3[2]
Cor (B-V) 0,68[2]
Astrometria
Velocidade radial 48,9 km/s[1]
Mov. próprio (AR) -152,39 mas/a[1]
Mov. próprio (DEC) 36,12 mas/a[1]
Paralaxe 30,20 ± 1,03 mas[1]
Distância 108 ± 4 anos-luz
33 ± 1 pc
Magnitude absoluta 5,17[2]
Detalhes
Massa 0,96 ± 0,04[2] M☉
Raio 0,86 ± 0,04[2] R☉
Gravidade superficial 4,5 ± 0,1 (log g)[2]
Temperatura 5 700 ± 50[2] K
Metalicidade [Fe/H] -0,16 ± 0,06[2]
Rotação 2 ± 1 km/s[2]
Outras denominações
BD+20°2374, FK5 4836, GC 12951, HIP 46070, SAO 80800.[1]

HD 81040 é uma estrela na constelação de Leo. Tem uma magnitude aparente de 7,73,[1] sendo invisível a olho nu. Medições de paralaxe mostram que se encontra relativamente próxima do Sistema Solar, a uma distância de aproximadamente 108 anos-luz (33 parsecs) da Terra.[1]

HD 81040 é uma estrela parecida com o Sol com uma classificação estelar de G0 V[1] ou G2/G3,[2] o que significa que é uma estrela de classe G da sequência principal (anã amarela). Tem uma massa de 0,96 vezes a massa solar e um raio de 0,86 vezes o raio solar. Sua temperatura efetiva é de 5 700 K.[2]

Em 2005, foi descoberto um planeta extrassolar gasoso com uma massa mínima de 6,86 massas de Júpiter orbitando HD 81040. Orbita a estrela a uma distância média de 1,94 UA em uma órbita excêntrica com um período orbital de 1001,7 dias.[2]

O sistema HD 81040 [2]
Planeta Massa
 Semieixo maior
(UA)
 Período orbital
(dias)
 Excentricidade
b >6,86 ± 0,71 MJ
 1,94
 1001,7 ± 7,0
 0,526 ± 0,042

Ver também

Referências

  1. ↑ a b c d e f g h i j k l «SIMBAD query result - HD 81040». SIMBAD. Centre de Données astronomiques de Strasbourg. Consultado em 22 de novembro de 2012 
  2. ↑ a b c d e f g h i j k l m Sozzetti, A.; et al. (abril de 2006). «A massive planet to the young disc star HD 81040». Astronomy and Astrophysics. 449 (1). pp. 417–424. Bibcode:2006A&A...449..417S. arXiv:astro-ph/0511679Acessível livremente. doi:10.1051/0004-6361:20054303 

Ligações externas

  • HD 81040 The Extrasolar Planets Encyclopaedia

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