Valétudo (lune)

Valétudo
Jupiter LXII
Image illustrative de l’article Valétudo (lune)
Valétudo (point blanc entre les traits jaunes).
Type Satellite naturel de Jupiter
Caractéristiques orbitales
(Époque )
Demi-grand axe 18 930 000 km[1]
Excentricité 0,222[1]
Période de révolution 533,3 d[1]
Inclinaison 34,015°[1]
Caractéristiques physiques
Dimensions ?
Caractéristiques de l'atmosphère
Pression atmosphérique -
Découverte
Découvreur Scott S. Sheppard
Date de la plus ancienne prédécouverte -
Date de la découverte
Publication
Désignation(s)
Désignation(s) provisoire(s) S/2016 J 2

Valétudo (Jupiter LXII, désignation provisoire S/2016 J 2) est un satellite naturel de Jupiter[1].

Désignation et nom

Lors de l'annonce de sa découverte, le satellite reçoit la désignation provisoire S/2016 J 2.

Lors de l'annonce de sa découverte, le découvreur proposa de baptiser le satellite Valétudo, du nom de l'arrière-petite-fille du dieu romain Jupiter, déesse de la santé et de l'hygiène, équivalent romain de la déesse grecque Hygie[2],[3].

Le satellite reçoit sa désignation permanente, Jupiter LXII, le dans la Minor Planet Circular no 111804[4].

Le nom Valétudo est finalement entériné par l'Union astronomique internationale le [5].

Dimensions

Valétudo mesure un peu moins d’un kilomètre de diamètre seulement, ce qui en fait probablement le plus petit satellite de Jupiter[2].

Caractéristique orbitales

Valétudo a été qualifié de « oddball » (« extravagante ») par son découvreur Scott S. Sheppard en raison de son orbite particulière. En effet, Valétudo a une orbite prograde (mouvement dans le même sens que la rotation de Jupiter) d'une période d'environ un an et demi, située bien au-delà des autres satellites de Jupiter ayant une orbite prograde et se trouvant au milieu de satellites qui sont eux sur des orbites rétrogrades.

Références

  1. a b c d et e Williams 2018.
  2. a et b « New Jupiter Moons », sur sites.google.com
  3. L.Br. et AFP, « Parmi les nouveaux satellites de Jupiter, les scientifiques découvrent une lune au comportement étrange », sur 20minutes.fr, (consulté le ).
  4. MPC 110-641-111804 : la MPC 111804 est la dernière page.
  5. USGS Astrogeology Science Center, [Nomenclature News: Name Approved for Jovian Satellite: Valetudo https://astrogeology.usgs.gov/news/nomenclature/name-approved-for-jovian-satellite-valetudo]

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