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HR 4339

HR 4339
Données d'observation
(époque J2000.0)
Ascension droite 11h 09m 53,39401s[1]
Déclinaison −32° 22′ 03,1048″[1]
Constellation Hydre
Magnitude apparente 5,766[2]

Localisation dans la constellation : Hydre

(Voir situation dans la constellation : Hydre)
Caractéristiques
Type spectral A1 V[3]
Indice B-V +0,027[4]
Variabilité aucune[5]
Astrométrie
Vitesse radiale −1,80 ± 0,21 km/s[1]
Mouvement propre μα = +18,242 ± 0,044 mas/a[1]
μδ = −29,562 ± 0,055 mas/a[1]
Parallaxe 8,923 2 ± 0,081 6 mas[1]
Distance 109,475 ± 0,634 pc (∼357 al)[6]
Magnitude absolue +0,38[4]
Caractéristiques physiques
Masse 2,61 ± 0,06 M☉[7]
Luminosité 72,1+7,8
−7,0 L☉[7]
Température 9 120+127
−215 K[7]
Rotation 73 km/s[7]

Désignations

β (Beta) Antliae, HD 97023, HIP 54561, HR 4339, CD-31 8816, CPD-31 3233, NSV 5111, SAO 202149[6]

modifier

HR 4339, autrefois connue sous le nom β (Beta) Antliae, est une étoile située dans la constellation de l'Hydre. Sa magnitude apparente est de 5,77[2]. D'après la mesure de sa parallaxe annuelle par le satellite Gaia, l'étoile est située à environ ∼ 357 a.l. (∼ 109 pc) de la Terre[1]. Elle s'en rapproche à une vitesse radiale héliocentrique de −2 km/s[1].

Nicolas-Louis de Lacaille lui donne le nom de β Antliae, et Benjamin Gould la conserve dans la constellation de la Machine pneumatique. Cependant, le tracé des frontières des constellations en 1930 entraîne le transfert de cette étoile à la constellation de l'Hydre[8].

HR 4339 est une étoile blanche de la séquence principale de type spectral A1 V[3]. Elle est environ 2,6 fois plus massive que le Soleil et elle tourne sur elle-même à une vitesse de rotation projetée de 73 km/s[7]. Elle brille avec une luminosité d'environ 72 fois celle du Soleil et a une température de surface de 9 120 K[7].

Notes et références

  1. ↑ a b c d e f g et h (en) A. Vallenari et al. (Gaia collaboration), « Gaia Data Release 3 : Summary of the content and survey properties », Astronomy & Astrophysics, vol. 674,‎ , article no A1 (DOI 10.1051/0004-6361/202243940, Bibcode 2023A&A...674A...1G, arXiv 2208.00211). Notice Gaia DR3 pour cette source sur VizieR.
  2. ↑ a et b (en) E. Høg et al., « The Tycho-2 catalogue of the 2.5 million brightest stars », Astronomy & Astrophysics, vol. 355,‎ , L27-L30 (DOI 10.1888/0333750888/2862, Bibcode 2000A&A...355L..27H)
  3. ↑ a et b (en) Nancy Houk, Catalogue of two-dimensional spectral types for the HD stars : Declinations -40° to -26°, vol. 3, Ann Arbor, Michigan, États-Unis, Département d'astronomie de l'université du Michigan, , 12 + 390 (Bibcode 1982MSS...C03....0H)
  4. ↑ a et b (en) E. Anderson et Ch. Francis, « XHIP: An extended Hipparcos compilation », Astronomy Letters, vol. 38, no 5,‎ , p. 331 (DOI 10.1134/S1063773712050015, Bibcode 2012AstL...38..331A, arXiv 1108.4971)
  5. ↑ (en) N. N . Samus', E. V. Kazarovets et al., « General Catalogue of Variable Stars: NSV and supplement », Astronomy Reports, vol. 61, no 1,‎ , p. 80 (DOI 10.1134/S1063772917010085, Bibcode 2017ARep...61...80S, lire en ligne, consulté le )
  6. ↑ a et b (en) HD 97023 sur la base de données Simbad du Centre de données astronomiques de Strasbourg.
  7. ↑ a b c d e et f (en) J. Zorec et F. Royer, « Rotational velocities of A-type stars. IV. Evolution of rotational velocities », Astronomy & Astrophysics, vol. 537,‎ , article no A120 (DOI 10.1051/0004-6361/201117691, Bibcode 2012A&A...537A.120Z, arXiv 1201.2052)
  8. ↑ (en) Morton Wagman, Lost Stars : Lost, Missing and Troublesome Stars from the Catalogues of Johannes Bayer, Nicholas Louis de Lacaille, John Flamsteed, and Sundry Others, Blacksburg, Virginie, The McDonald & Woodward Publishing Company, , 540 p. (ISBN 978-0-939923-78-6), p. 29

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