Rasalhague

Rasalhague

Alpha Ophiuchi

Alpha Ophiuchi
(Ras Alhague)
Ophiuchus constellation map-fr.png
Cercle rouge 100%.svg

Localisation d'Alpha Ophiuchi (entourée en rouge)
dans la constellation d'Ophiuchus.
Données d'observation
(Époque J2000.0)
Ascension droite 17h 34m 56,00s[1]
Déclinaison 12° 33′ 38,1″[1]
Constellation Ophiuchus
Magnitude apparente 2,08[1]
Magnitude absolue  ?
Distance 46,7 ± 0,6[1] al
(14,3 ± 0,2 pc)
Type spectral A5III[1]
Autres désignations
α Oph (Bayer), 55 Oph (Flamsteed), HR 6556, HD 159561, BD+12 3252, FK5 656, HIP 6686, SAO 102932, CCDM 17349 +1234

Alpha Ophiuchi (α Oph, traditionnellement Ras Alhague) est l'étoile la plus brillante de la constellation d'Ophiuchus. En astronomie chinoise, elle porte le nom de Hou, représentant un astrologue assistant un empereur, Dizuo (α Herculis / Ras Algethi).

Caractéristiques

Alpha Ophiuchi est une étoile binaire[2]. La primaire est une étoile géante blanche d'un type spectral A5III, distante d'environ 46 années-lumière de la Terre[1]. Elle ne présente pas de signe de variabilité et sa magnitude apparente est de +2,08, ce qui lui donne une magnitude absolue de +1,30 ± 0,03.

Nom traditionnel

Alpha Ophiuchi est également connue sous le nom traditionnel de Ras Alhague ou Rasalhague (de l'arabe رأس الحية, raʾs al-ḥayyah, signifiant « la tête du charmeur de serpent »).

Voir aussi

Liens internes

Lien externe

Notes et références

  1. a , b , c , d , e  et f ESA, « The Hipparcos Main Catalogue », 1997, Centre de données astronomiques de Strasbourg. Consulté le 2 mars 2007
  2. Jean Dommanget & Omer Nys, « Catalogue des composantes d'étoiles doubles et multiples », 1994, Centre de données astronomiques de Strasbourg. Consulté le 2 mars 2007
  • Portail de l’astronomie Portail de l’astronomie
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