Prócion

Coordenadas: Sky map 07h 39m 18.10s, +05° 13′ 30″

Procyon
Dados observacionais (J2000)
Constelação Canis Minor
Asc. reta 07h 39m 18,12s[1]
Declinação +05° 13′ 29,96″[1]
Magnitude aparente A: 0,37[1]
B: 10,82 ± 0,03[2]
Características
Tipo espectral F5IV-V + DQZ[1]
Cor (U-B) 0,03[1]
Cor (B-V) 0,42[1]
Astrometria
Velocidade radial -3,2 km/s[1]
Mov. próprio (AR) -714,59 mas/a[1]
Mov. próprio (DEC) -1036,80 mas/a[1]
Paralaxe 285,0 ± 0,7 mas[2]
Distância 11,444 ± 0,029 anos-luz
3,509 ± 0,009 pc
Magnitude absoluta A: 2,64
B: 13,09
Detalhes
Procyon A
Massa 1,478 ± 0,012[2] M☉
Raio 2,048 ± 0,025[3] R☉
Gravidade superficial log g = 3,96 cgs[3]
Luminosidade 7,1 ± 1,0[3] L☉
Temperatura 6530 ± 50[3] K
Metalicidade [Fe/H] = -0,05 ± 0,03[3]
Rotação v sin i = 3,16 ± 0,50 km/s[3]
Idade 2,7 bilhões[2] de anos
Procyon B
Massa 0,592 ± 0,006[2] M☉
Raio 0,01232 ± 0,00032[2] R☉
Gravidade superficial log g = 8,028 ± 0,023 cgs[2]
Luminosidade 0,0005[2] L☉
Temperatura 7740 ± 50[2] K
Outras denominações
α Canis Minoris, 10 Canis Minoris, BD+05 1739, GJ 280, HR 2943, HD 61421, HIP 37279, SAO 115756.[1]
Prócion

Prócion, também chamada de Procyon, α CMi, α Canis Minoris ou alpha Canis Minoris (latim: Alfa do Cão Menor) ou Antecanis (latim antigo: "Antes de cão")[4] é a estrela mais brilhante da constelação de Cão Menor e a nona estrela mais brilhante visível a olho nu no céu noturno.

É orbitada por uma anã branca, chamada de Prócion B, ou Procyon B.

Na Bandeira do Brasil, Prócion representa o estado do Amazonas.

Etimologia

O nome Procyon é um helenismo, que significa "antes do cão", por ser a estrela que precedia a ascensão de Sírius (vulga Estrela-Cão) no hemisfério norte. Daí seu nome alternativo Antecanis entre os antigos romanos, que nada mais era que uma tradução literal do grego.[4]

Ver também

Referências

  1. ↑ a b c d e f g h i j «* alf CMi -- Spectroscopic binary». SIMBAD. Centre de Données astronomiques de Strasbourg. Consultado em 20 de setembro de 2017 
  2. ↑ a b c d e f g h i Bond, Howard E.; et al. (novembro de 2015). «Hubble Space Telescope Astrometry of the Procyon System». The Astrophysical Journal. 813 (2): artigo 106, 19. Bibcode:2015ApJ...813..106B. doi:10.1088/0004-637X/813/2/106 
  3. ↑ a b c d e f Kervella, P.; et al. (janeiro de 2004). «The diameter and evolutionary state of Procyon A. Multi-technique modeling using asteroseismic and interferometric constraints». Astronomy and Astrophysics. 413: 251-256. Bibcode:2004A&A...413..251K. doi:10.1051/0004-6361:20031527 
  4. ↑ a b MACHADO, Saulo (15 de março de 2012). «Procyon, por que te chamam assim?». AstroPT 
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