HD 148156

HD 148156
Dados observacionais (J2000)
Constelação Norma
Asc. reta 16h 28m 17,28s[1]
Declinação -46° 19′ 03,46″[1]
Magnitude aparente 7,69[1]
Características
Tipo espectral F8V[2]
Cor (B-V) 0,560[2]
Astrometria
Velocidade radial -1,748 km/s[2]
Mov. próprio (AR) 45,59 mas/a[3]
Mov. próprio (DEC) 27,93 mas/a[3]
Paralaxe 17,4755 ± 0,0452 mas[3]
Distância 186,64 ± 0,48 anos-luz
57,223 ± 0,148 pc
Magnitude absoluta 3,90
Detalhes
Massa 1,22 ± 0,01[4] M☉
Raio 1,19 ± 0,02[4] R☉
Gravidade superficial log g = 4,36 ± 0,01 cgs[4]
Luminosidade 1,84 ± 0,03[4] L☉
Temperatura 6156 ± 23[4] K
Metalicidade [Fe/H] = 0,29 ± 0,02[2]
Rotação v sin i = 5,70 ± 1,0 km/s[2]
Idade 1,2 ± 0,5 bilhões[4]
>3 bilhões[2] de anos
Outras denominações
CD-46 10768, HD 148156, HIP 80680, SAO 226791.[1]
HD 148156

HD 148156 é uma estrela na constelação de Norma. Com uma magnitude aparente visual de 7,69,[1] tem um brilho baixo demais para ser visível a olho nu. De acordo com dados de paralaxe, do segundo lançamento do catálogo Gaia, está localizada a uma distância de 186,6 anos-luz (57,2 parsecs) da Terra.[3]

Esta é uma estrela de classe F da sequência principal com um tipo espectral de F8V,[2] sendo portanto maior e mais luminosa que o Sol. Possui uma massa estimada de 122% da massa solar e um raio de 119% do raio solar. Sua fotosfera está brilhando com uma luminosidade 84% superior à solar, e tem uma temperatura efetiva de 6 160 K.[4] Esta estrela apresenta uma alta metalicidade, com uma abundância de ferro de aproximadamente o dobro da solar.[2] Seu nível de atividade cromosférica é baixo, o que indica uma idade de mais de 3 bilhões de anos,[2] apesar de suas propriedades serem mais consistentes com uma idade de 1,2 bilhões de anos.[4]

HD 148156 foi incluída na amostra de estrelas observadas pelo espectrógrafo HARPS como parte de sua busca por planetas extrassolares pelo método da velocidade radial. A estrela foi observada pelo HARPS 42 vezes entre julho de 2003 e julho de 2009, revelando variações na sua velocidade radial consistentes com a presença de um corpo em órbita. A solução orbital indica que o planeta é um gigante gasoso com uma massa mínima de 85% da massa de Júpiter, levando 1030 dias para completar uma órbita. Sua órbita tem uma alta excentricidade de 0,52, levando o planeta a distâncias de 1,18 até 3,72 UA da estrela.[2]

O sistema HD 148156 [2]
Planeta Massa
 Semieixo maior
(UA)
 Período orbital
(dias)
 Excentricidade
b >0,85+0,06
−0,05 MJ
 2,45+0,04
−0,05
 1027 ± 28
 0,52+0,04
−0,09

Ver também

Referências

  1. ↑ a b c d e «HD 148156 -- Star». SIMBAD. Centre de Données astronomiques de Strasbourg. Consultado em 6 de fevereiro de 2018 
  2. ↑ a b c d e f g h i j k Naef, D.; et al. (novembro de 2010). «The HARPS search for southern extrasolar planets. XXIII. 8 planetary companions to low-activity solar-type stars». Astronomy and Astrophysics. 523: A15, 8 pp. Bibcode:2010A&A...523A..15N. doi:10.1051/0004-6361/200913616 
  3. ↑ a b c d Gaia Collaboration; Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; et al. (2018). «Gaia Data Release 2. Summary of the contents and survey properties». Astronomy & Astrophysics. 616: A1, 22 pp. Bibcode:2018A&A...616A...1G. arXiv:1804.09365Acessível livremente. doi:10.1051/0004-6361/201833051  Catálogo Vizier
  4. ↑ a b c d e f g h Bonfanti, A.; Ortolani, S.; Nascimbeni, V. (janeiro de 2016). «Age consistency between exoplanet hosts and field stars». Astronomy & Astrophysics. 585: A5, 14 pp. Bibcode:2016A&A...585A...5B. doi:10.1051/0004-6361/201527297 

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