Kappa Serpentis

Kappa Serpentis
Gudja
Données d'observation
(époque J2000.0)
Ascension droite 15h 48m 44,377s[1]
Déclinaison +18° 08′ 29,63″[1]
Constellation Serpent
Magnitude apparente 4,09[2]

Localisation dans la constellation : Serpent

(Voir situation dans la constellation : Serpent)
Caractéristiques
Type spectral M0.5III[3]
Indice U-B +1,95[2]
Indice B-V +1,62[2]
Variabilité suspectée
Astrométrie
Vitesse radiale −38,48 ± 0,14 km/s[4]
Mouvement propre μα = −51,88 mas/a[1]
μδ = −88,10 mas/a[1]
Parallaxe 8,54 ± 0,23 mas[1]
Distance 380 ± 10 al
(117 ± 3 pc)
Magnitude absolue −1,25[5]
Caractéristiques physiques
Rayon 51,3+5,1
−4,9
 R[6]
Luminosité 628,0 ± 33,8 L[6]
Température 4 033+206
−185
 K[6]

Désignations

Gudja, κ Ser, 35 Ser, HR 5879, HD 141477, HIP 77450, BD+18°3074, FK5 584, SAO 101752, NSV 7269[7]

Kappa Serpentis (κ Serpentis / κ Ser), également nommée Gudja, est une étoile géante de la constellation équatoriale du Serpent, localisée dans sa tête (Serpens Caput). L'étoile est visible à l'œil nu avec une magnitude apparente de 4,09[2]. D'après la mesure de sa parallaxe par le satellite Hipparcos, elle est distante d'environ ∼ 380 a.l. (∼ 117 pc) de la Terre[1], et elle se rapproche du système solaire à une vitesse radiale de −38,5 km/s[4].

Propriétés

Kappa Serpentis est une étoile géante rouge de type spectral M0,5III[3]. Après avoir épuisé les réserves en hydrogène de son cœur et avoir quitté la séquence principale, l'étoile s'est refroidie et étendue elle est désormais environ 51 fois plus grande que le Soleil. Sa luminosité vaut 628 fois celle du Soleil et sa température de surface est de 4 033 K[6].

Kappa Serpentis est une étoile variable suspectée[8].

Nomenclature

κ Serpentis (latinisé vers Kappa Serpentis) est la désignation de Bayer de l'étoile. Elle porte également la désignation de Flamsteed de 35 Serpentis[7].

L'étoile porte le nom traditionnel de Gudja dans la culture du peuple Wardaman (en) habitant le Territoire du Nord en Australie. Il s'agit d'un mot qui désigne les varans d'eau australiens (water goanna)[9]. En 2016, le Groupe de travail de l'Union astronomique internationale sur les noms d'étoiles a officialisé le nom de Gudja pour désigner l'étoile et elle figure désormais dans la liste des noms d'étoiles officiellement reconnus par l'UAI[10].

Notes et références

  1. a b c d e et f (en) F. van Leeuwen, « Validation of the new Hipparcos reduction », Astronomy & Astrophysics, vol. 474, no 2,‎ , p. 653–664 (DOI 10.1051/0004-6361:20078357, Bibcode 2007A&A...474..653V, arXiv 0708.1752, lire en ligne)
  2. a b c et d (en) J. R. Ducati, « Catalogue de données en ligne VizieR : Catalogue of Stellar Photometry in Johnson's 11-color system », CDS/ADC Collection of Electronic Catalogues, 2237, 0,‎ (Bibcode 2002yCat.2237....0D)
  3. a et b (en) Philip C. Keenan et Raymond C. McNeil, « The Perkins catalog of revised MK types for the cooler stars », The Astrophysical Journal Supplement Series, vol. 71,‎ , p. 245 (DOI 10.1086/191373, Bibcode 1989ApJS...71..245K)
  4. a et b (en) B. Famaey et al., « Spectroscopic binaries among Hipparcos M giants – I. Data, orbits, and intrinsic variations », Astronomy & Astrophysics, vol. 498, no 2,‎ , p. 627–640 (DOI 10.1051/0004-6361/200810698, Bibcode 2009A&A...498..627F, arXiv 0901.0934)
  5. (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)
  6. a b c et d (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.
  7. a et b (en) * kap Ser -- High proper-motion Star sur la base de données Simbad du Centre de données astronomiques de Strasbourg.
  8. (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)
  9. (en) « IAU Working Group on Star Names (WGSN) », Union astronomique internationale
  10. (en) « IAU Catalog of Star Names (IAU-CSN) » [txt], Union astronomique internationale (consulté le )

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