(17) Thétis

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Pour les articles homonymes, voir Thétis (homonymie).

(17) Thétis
(17) Thetis
Description de cette image, également commentée ci-après
symbole de Thétis
Caractéristiques orbitales
Époque (JJ 2453300,5)
Établi sur 3 435 observ. couvrant 60 636 jours (U = 0)
Demi-grand axe (a) 369,530 × 106 km
(2,470 ua)
Périhélie (q) 319,991 × 106 km
(2,139 ua)
Aphélie (Q) 419,069 × 106 km
(2,801 ua)
Excentricité (e) 0,134
Période de révolution (Prév) 1 418,027 j
(3,88 a)
Vitesse orbitale moyenne (vorb) 18,87 km/s
Inclinaison (i) 5,587°
Longitude du nœud ascendant (Ω) 125,622°
Argument du périhélie (ω) 135,906°
Anomalie moyenne (M0) 38,435°
Catégorie Astéroïde de la ceinture principale
Caractéristiques physiques
Dimensions 90 km[1]
Masse (m) 7,6 × 1017 kg
Masse volumique (ρ) ? 2 000 kg/m3
Gravité équatoriale à la surface (g) 0,025 2 m/s2
Vitesse de libération (vlib) 0,047 6 km/s
Période de rotation (Prot) 0,511 3 j
(12,27 h[2])
Classification spectrale S
Magnitude absolue (H) 7,76
Albédo (A) 0,171 5 [1]
Température (T) ~ 173 K

Découverte
Date
Découvert par R. Luther
Nommé d'après Thétis
Désignation A913 CA
A916 YF
1954 SO1

modifier

(17) Thétis est un gros astéroïde de la ceinture principale d'astéroïdes qui a été découvert par Robert Luther à l'observatoire de Düsseldorf-Bilk le . Ce fut sa première découverte d'astéroïdes. Le nom vient de Thétis, mère d'Achille dans la mythologie grecque. Son symbole était .

Une occultation stellaire par Thétis a été observée à partir de l'Oregon en 1999. Cependant, l'événement ne fit pas l'objet d'enregistrements.

Le spectre de cet objet indique qu'il est un astéroïde de type S contenant à sa surface du pyroxène des deux formes, c'est-à-dire faible et élevée en calcium, ainsi qu'au moins 20 % d'olivine. Le pyroxène riche en calcium forme 40 % ou plus du total du pyroxène présent, ce qui indique l'existence historique de dépôts de roches magmatiques (roches ignées). Ceci suggère que l'astéroïde a subi une différenciation planétaire par fusion, et la création d'une surface de roches basaltiques.

Masse

La masse de Thétis a été calculée à partir de perturbations de (4) Vesta et de (11) Parthénope. En 2007, Baer et Chesley ont calculé que Thétis avait une masse de 1,2 × 1018 kg avec une densité de 3,21 g/cm3.

Références

  1. ↑ a et b IRAS
  2. ↑ Aude

Compléments

Articles connexes

Liens externes

Sur les autres projets Wikimedia :

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