HD 100825

C2 Centauri
Dados observacionais (J2000)
Constelação Centaurus
Asc. reta 11h 35m 55,6s[1]
Declinação -47° 38′ 29,9″[1]
Magnitude aparente 5,252[1]
Características
Tipo espectral F0V[1]
A7m[2]
A7-F2[3]
Cor (U-B) 0,11[3]
Cor (B-V) 0,242[1]
Astrometria
Velocidade radial 5,2 km/s[1]
Mov. próprio (AR) 33,90 mas/a[4]
Mov. próprio (DEC) -49,63 mas/a[4]
Paralaxe 17,3990 ± 0,1049 mas[4]
Distância 187,5 ± 1,1 anos-luz
57,47 ± 0,35 pc
Magnitude absoluta 1,45
Detalhes
Massa 1,58-1,82[5] M☉
Raio 2,656 ± 0,112[6] R☉
Gravidade superficial log g = 3,97 cgs[5]
Luminosidade 22,85[7] L☉
Temperatura 7737 ± 263[5] K
Rotação v sin i = 60 km/s[3]
Idade 467-1047 milhões[5]
de anos
Outras denominações
C2 Centauri, FK5 435, CD-46 7205, HR 4466, HD 100825, HIP 56573, SAO 222895.[1]
HD 100825

HD 100825 (C2 Centauri) é uma estrela na constelação de Centaurus. Tem uma magnitude aparente visual de 5,25,[1] sendo visível a olho nu em locais com pouca poluição luminosa. Com base em medições de paralaxe, está localizada a aproximadamente 188 anos-luz (57,5 parsecs) da Terra.[4]

Esta é uma estrela de classe A ou F da sequência principal que já foi classificada com um tipo espectral de F0V[1] ou A7m,[2] com a notação 'm' indicando que é uma estrela com linhas metálicas (estrela Am). Tem uma massa próxima de 1,6 vezes a massa solar e uma idade mais provável na faixa de 0,4 a 1,1 bilhões de anos.[5] Seu raio foi calculado diretamente a partir de um raio angular de 0,213 milissegundos de arco, sendo equivalente a 2,66 vezes o raio solar.[6] Está irradiando de sua fotosfera 23 vezes a luminosidade solar[7] a uma temperatura efetiva de 7 750 K.[5] Não possui estrelas companheiras conhecidas.[2]

Ver também

Referências

  1. ↑ a b c d e f g h i «SIMBAD query result - C02 Cen». SIMBAD. Centre de Données astronomiques de Strasbourg. Consultado em 4 de maio de 2017 
  2. ↑ a b c Eggleton, P. P.; Tokovinin, A. A. (setembro de 2008). «A catalogue of multiplicity among bright stellar systems». Monthly Notices of the Royal Astronomical Society. 389 (2): 869-879. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x 
  3. ↑ a b c Renson, P.; Manfroid, J (maio de 2009). «Catalogue of Ap, HgMn and Am stars». Astronomy and Astrophysics. 498 (3): 961-966. Bibcode:2009A&A...498..961R. doi:10.1051/0004-6361/200810788 
  4. ↑ 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
  5. ↑ a b c d e f David, Trevor J.; Hillenbrand, Lynne A (março de 2015). «The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets». The Astrophysical Journal. 804 (2). 38 páginas. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146 
  6. ↑ a b Masana, E.; Jordi, C.; Ribas, I (maio de 2006). «Effective temperature scale and bolometric corrections from 2MASS photometry». Astronomy and Astrophysics. 450 (2): 735-746. Bibcode:2006A&A...450..735M. doi:10.1051/0004-6361:20054021 
  7. ↑ a b McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (novembro de 2012). «Fundamental parameters and infrared excesses of Hipparcos stars». Monthly Notices of the Royal Astronomical Society. 427 (1): 343-357. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x 

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