Theta Cassiopeiae

θ Cassiopeiae
Données d'observation
(époque J2000.0)
Ascension droite 01h 11m 06,162s[1]
Déclinaison +55° 08′ 59,65″[1]
Constellation Cassiopée
Magnitude apparente +4,33[2]

Localisation dans la constellation : Cassiopée

(Voir situation dans la constellation : Cassiopée)
Caractéristiques
Type spectral A7V[2]
Indice U-B +0,12[2]
Indice B-V +0,17[2]
Indice R-I +0,07[2]
Variabilité suspectée[3]
Astrométrie
Vitesse radiale +2,5 ± 0,6 km/s[4]
Mouvement propre μα = +226,77 mas/a[1]
μδ = −18,75 mas/a[1]
Parallaxe 24,42 ± 0,24 mas[1]
Distance 134 ± 1 al
(41,0 ± 0,4 pc)

Désignations

Marfak, θ Cas, 33 Cas, HR 343, HD 6961, HIP 5542, SAO 22070, BD+54°236, LTT 10428, WDS J01111 +5509A[5]

Theta Cassiopeiae (θ Cas / θ Cassiopeiae, Thêta Cassiopeiae) est une étoile située dans la constellation de Cassiopée. Son nom traditionnel est Marfak, qu'elle partage avec les étoiles μ Cassiopeiae, κ Herculis et α Persei (voir Marfak)[6]. Elle est visible à l'œil nu avec une magnitude apparente de 4.33[2]. D'après la mesure de sa parallaxe annuelle par le satellite Hipparcos, elle est située à environ ∼ 134 a.l. (∼ 41,1 pc) de la Terre[1].

Theta Cassiopeiae est une étoile blanche de la séquence principale de type spectral A7V[2]. Il s'agit d'une variable suspectée dont la magnitude a été notée varier entre 4,32 et 4,36[3]. En astronomie chinoise, cette étoile fait vraisemblablement partie de l'astérisme Gedao, représentant une route escarpée traversant un territoire montagneux.

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)
  2. a b c d e f et g (en) D. Hoffleit et W. H. Warren, « Bright Star Catalogue, 5e éd. », Catalogue de données en ligne VizieR : V/50. Publié à l'origine dans : 1964BS....C......0H, vol. 5050,‎ (Bibcode 1995yCat.5050....0H)
  3. a et b (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)
  4. (en) G. A. Gontcharov, « Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system », Astronomy Letters, vol. 32, no 11,‎ , p. 759 (DOI 10.1134/S1063773706110065, Bibcode 2006AstL...32..759G, arXiv 1606.08053)
  5. (en) * tet Cas -- High proper-motion Star sur la base de données Simbad du Centre de données astronomiques de Strasbourg.
  6. N. D. Kostjuk, « HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index », Centre de données astronomiques de Strasbourg, (consulté le )

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