Β Car
- Β Car
-
Beta Carinae
Beta Carinæ
(β Car / β Carinæ) |
Données d'observation
(Époque J2000) |
| Ascension droite |
09h 13m 12.0s |
| Déclinaison |
-69° 43′ 02″ |
| Constellation |
Carène |
| Magnitude apparente |
1,67 |
| Caractéristiques |
| Type spectral |
A2 IV |
| Indice U-B |
0,03 |
| Indice B-V |
0,00 |
| Indice R-I |
? |
| Variabilité |
Néant |
| Astrométrie |
| Vitesse radiale |
-5,2 km/s |
| Mouvement propre |
μα=-157,66 mas/a
μδ=108,91 mas/a |
| Parallaxe |
29,34 ± 0,47 mas |
| Distance |
111 ± 2 al
(34,1 ± 0,5 pc) |
| Magnitude absolue |
-1,00 |
| Caractéristiques physiques |
| Masse |
3 M☉ |
| Rayon |
5,7 R☉ |
| Gravité de surface (log g) |
? |
| Luminosité |
210 L☉ |
| Température |
9 100 K |
| Métallicité |
? |
| Rotation |
2,1 jours |
| Âge |
3,5 × 108 a
|
| Autres désignations |
| Miaplacidus, β Car (Bayer), HR 3685, HD 80007, SAO 250495, CD-69 600, FK5 348, GJ 339.2, GCTP 2213.00, HIP 45238, GC 12764 |
Beta Carinæ (β Car / β Carinæ) est la deuxième étoile la plus brillante de la constellation de la Carène. Elle est également appelée par son nom traditionnel Miaplacidus. Ce nom est une combinaison du mot arabe مياه miyāh, « les eaux » et du mot latin placidus, « placide ». Donc ce nom signifie « eaux placides ».
Elle fait partie de l'astérisme de la Croix de diamant.
Voir aussi
Liens externes
Portail de l’astronomie
Catégories : Constellation de la Carène | Étoile de type spectral AIV
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