HD 152079 b

HD 152079 b
Exoplaneta Estrelas com exoplanetas
Estrela mãe[1]
Estrela HD 152079
Constelação Ara
Ascensão reta 16h 53m 29,7s
Declinação -46° 19′ 58,6″
Magnitude aparente 9,16
Distância 278 ± 5 anos-luz
85,1 ± 1,7 pc
Tipo espectral G6V
Elementos orbitais[2]
Semieixo maior 3,98 ± 0,15 UA
Excentricidade 0,52 ± 0,02
Período orbital 2899 ± 52 dias
7,94 ± 0,14 anos
Argumento do periastro 325,9 ± 3,4°
Semi-amplitude 31,3 ± 1,1 m/s m/s
Características físicas[2]
Massa >2,18 ± 0,17 MJ
Descoberta[3]
Data da descoberta 2010
Descobridores Arriagada et al.
Método de detecção Espectroscopia Doppler
Estado da descoberta Publicada
Outras designações
HIP 82632 b

HD 152079 b é um planeta extrassolar que orbita a estrela HD 152079, localizada na constelação de Ara a aproximadamente 278 anos-luz (85,1 parsecs) da Terra. Foi descoberto em 2010 pelo Magellan Planet Search Program com uso do método da velocidade radial, que consiste em buscar variações na velocidade radial de uma estrela causadas pela presença de um planeta em órbita.[3] Em 2017 teve seus parâmetros atualizados.[2]

Este planeta é um gigante gasoso com uma massa mínima de 2,18 vezes a massa de Júpiter. Orbita a estrela a um raio orbital médio de 4 UA em cerca de 2900 dias, com uma alta excentricidade orbital.[2] Uma pesquisa em busca de potenciais alvos para trânsito calculou que a probabilidade do planeta possuir inclinação maior que 80° é de 34%.[4]

Referências

  1. ↑ «HD 152079 -- Star». Simbad. Centre de Données astronomiques de Strasbourg. Consultado em 26 de outubro de 2017 
  2. ↑ a b c d Jenkins, J. S.; et al. (abril de 2017). «New planetary systems from the Calan-Hertfordshire Extrasolar Planet Search». Monthly Notices of the Royal Astronomical Society. 466 (1): 443-473. Bibcode:2017MNRAS.466..443J. doi:10.1093/mnras/stw2811 
  3. ↑ a b Arriagada, Pamela; et al. (março de 2010). «Five Long-period Extrasolar Planets in Eccentric Orbits from the Magellan Planet Search Program». The Astrophysical Journal. 711 (2): 1229-1235. Bibcode:2010ApJ...711.1229A. doi:10.1088/0004-637X/711/2/1229 
  4. ↑ Herrero, E.; Ribas, I.; Jordi, C.; Guinan, E. F.; Engle, S. G. (janeiro de 2012). «Optimizing exoplanet transit searches around low-mass stars with inclination constraints». Astronomy & Astrophysics. 537: A147, 10. Bibcode:2012A&A...537A.147H. doi:10.1051/0004-6361/201117809 

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