Rasalhague
- Rasalhague
-
Alpha Ophiuchi
Alpha Ophiuchi
(Ras Alhague) |
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
- ↑ a , b , c , d , e et f ESA, « The Hipparcos Main Catalogue », 1997, Centre de données astronomiques de Strasbourg. Consulté le 2 mars 2007
- ↑ 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
Catégories : Constellation d'Ophiuchus | Étoile binaire | Étoile de type spectral AIII
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