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(6) Hébé

(6) Hébé
(6) Hebe
Description de cette image, également commentée ci-après
photo prise par le VLT
Caractéristiques orbitales
Époque (JJ 2453200,5)
Établi sur 6 204 observ. couvrant 63202 jours (U = 0)
Demi-grand axe (a) 362,959 × 106 km
(2,426 ua)
Périhélie (q) 289,958 × 106 km
(1,938 ua)
Aphélie (Q) 435,960 × 106 km
(2,914 ua)
Excentricité (e) 0,201
Période de révolution (Prév) 1 380,373 j
(3,78 a)
Vitesse orbitale moyenne (vorb) 18,93 km/s
Inclinaison (i) 14,765°
Longitude du nœud ascendant (Ω) 138,846°
Argument du périhélie (ω) 239,059°
Anomalie moyenne (M0) 118,017°
Catégorie Astéroïde de la ceinture principale
Caractéristiques physiques
Dimensions 185,2 km [1]
Masse (m) 6,7 × 1018 kg
Masse volumique (ρ) ? 2 000 kg/m3
Gravité équatoriale à la surface (g) 0,051 8 m/s2
Vitesse de libération (vlib) 0,097 9 km/s
Période de rotation (Prot) 0,303 1 j
Classification spectrale S
Magnitude absolue (H) 5,71
Albédo (A) 0,268 [1]
Température (T) ~170 K

Découverte
Date
Découvert par Karl Ludwig Hencke
Nommé d'après Hébé
Désignation 1947 JB

(6) Hébé (désignation internationale (6) Hebe) est un gros astéroïde de la ceinture principale. Sa surface est de couleur claire et est composée de nickel, de fer et de roches silicatées.

C'est le sixième astéroïde découvert, le . C'est la seconde et dernière découverte due à Karl Ludwig Hencke[2],[3], qui avait précédemment découvert (5) Astrée. C'est Carl Friedrich Gauss qui lui aurait donné le nom de la déesse grecque de la jeunesse, Hébé, échanson des dieux de l'Olympe jusqu'à ce qu'elle soit mariée à Héraclès. Le prince troyen Ganymède lui succéda alors.

Les premiers astéroïdes découverts possèdent un symbole astronomique et celui de Hébé est .

Le , Hébé occulta l'étoile de 3e magnitude Kaffaljidhma (γ Ceti). C'est la seule occultation observée jusqu'ici. Paul D. Maley déclara avoir détecté un petit satellite naturel orbitant autour de l'astéroïde lors de cette occultation[4], auquel il accorda le sobriquet « Jébé » (en anglais, « Hebe Jebe » = « Heebie Jeebies » est le nom d'une mélodie bien connue). Cette découverte n'a pas pu être confirmée jusqu'ici.

Références

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