HD 9446

HD 9446
Données d'observation
(époque J2000)
Ascension droite 01h 33m 20,1848s[1]
Déclinaison +29° 15′ 54,539″[1]
Constellation Triangle
Magnitude apparente 8,35[2]

Localisation dans la constellation : Triangle

(Voir situation dans la constellation : Triangle)
Caractéristiques
Type spectral G5V[2]
Astrométrie
Vitesse radiale 21,669 ± 0,002 2 km/s[3]
Mouvement propre μα = +190,249 mas/a[1]
μδ = −53,650 mas/a[1]
Parallaxe 19,833 6 ± 0,137 6 mas[1]
Distance 50,419 5 ± 0,349 7 pc (∼164 al)[1]
Caractéristiques physiques
Masse 1,00 ± 0,10 M☉[2]
Rayon 1,00 R☉[2]
Gravité de surface (log g) 4,41
Luminosité ~ 1,00 L☉
Température 5 793 ± 22 K[2]
Métallicité [Fe/H] = 0,09 ± 0,05[2]
Système planétaire
Planètes 2 : b et c

Désignations

HD 9446, HIP 7245, BD+28°253, SAO 74788, LTT 10545[4]

modifier

Le Soleil, un exemple de naine jaune.

HD 9446 est une étoile quasiment identique au Soleil située à environ 164 années-lumière (50,4 pc) du Système solaire[1] dans la constellation du Triangle. Il s'agit d'une naine jaune de masse semblable au Soleil, de même rayon et de même luminosité.

Un système planétaire à deux corps a été détecté autour de cette étoile le 5 janvier 2010 par la méthode des vitesses radiales :

Planète Masse
(MJ) 		Demi-grand axe
(UA) 		Période orbitale
(d) 		Excentricité
  HD 9446 b     ≥ 0,70 ± 0,06     0,189 ± 0,006   30,052 ± 0,027   0,20 ± 0,06
  HD 9446 c     ≥ 1,82 ± 0,17     0,654 ± 0,022   192,9 ± 0,9   0,06 ± 0,06
Système planétaire de HD 9446[5].

Notes et références

  1. ↑ a b c d e f et g (en) A. G. A. Brown et al. (Gaia collaboration), « Gaia Data Release 2 : Summary of the contents and survey properties », Astronomy & Astrophysics, vol. 616,‎ , article no A1 (DOI 10.1051/0004-6361/201833051, Bibcode 2018A&A...616A...1G, arXiv 1804.09365). Notice Gaia DR2 pour cette source sur VizieR.
  2. ↑ a b c d e et f (en) Exoplanet.eu – 5 janvier 2010 « Star: HD 9446 ».
  3. ↑ (en) C. Soubiran et al., « Gaia Data Release 2. The catalogue of radial velocity standard stars », Astronomy & Astrophysics, vol. 616,‎ , p. 8, article no A7 (DOI 10.1051/0004-6361/201832795, Bibcode 2018A&A...616A...7S, arXiv 1804.09370)
  4. ↑ (en) HD 9446 -- High proper-motion Star sur la base de données Simbad du Centre de données astronomiques de Strasbourg.
  5. ↑ (en) G. Hébrard, X. Bonfils, D. Ségransan, C. Moutou, X. Delfosse, F. Bouchy, I. Boisse, L. Arnold, M. Desort, R. F. Díaz, A. Eggenberger, D. Ehrenreich, T. Forveille, A.-M. Lagrange, C. Lovis, F. Pepe, C. Perrier, F. Pont, D. Queloz, N. C. Santos, S. Udry et A. Vidal-Madjar, « The SOPHIE search for northern extrasolar planets – II. A multiple planet system around HD 9446 », Astronomy & Astrophysics, vol. 513,‎ , A69 (lire en ligne) DOI 10.1051/0004-6361/200913790


v · m
Système HD 9446
Étoile HD 9446
Planètes
v · m
Étoiles de la constellation du Triangle
Bayer
Flamsteed
Étoiles variables
HR
HD
Autres
Liste d'étoiles du Triangle

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