(554099) 2012 KU50

2012 KU50[1]
Caractéristiques orbitales
Époque (JJ 2459396.5)
Établi sur 283 observ. couvrant 8094 jours (U = 2)
Demi-grand axe (a) 6,138 × 109 km
(41,033 ua)
Périhélie (q) 4,624 × 109 km
(30,911 ua)
Aphélie (Q) 7,651 × 109 km
(51,15 ua)
Excentricité (e) 0,246
Période de révolution (Prév) 96 009 ± 4 j
(262,8 a)
Inclinaison (i) 18,84°
Longitude du nœud ascendant (Ω) 66,78°
Argument du périhélie (ω) 127,45°
Anomalie moyenne (M0) 23,89°
Catégorie résonnance 5:8 avec Neptune
Satellites connus 1
Caractéristiques physiques
Dimensions 242 km[2]
160 km[3]
Magnitude absolue (H) 6,12[1]
6,5[2]
Albédo (A) 0,08[2]
0,126[3]
Découverte
Plus ancienne observation de pré-découverte
Date
Découvert par La Silla[4]
Lieu La Silla
Désignation 2012 KU50
(554099) 2012 KU50

(554099) 2012 KU50 est un objet transneptunien précédemment classé comme centaure, mais devrait probablement être en résonnance 5:8 avec Neptune[3].

Caractéristiques

(554099) 2012 KU50 mesure environ 240 km de diamètre.

Satellite

Le , Colin Orion Chandler, Chadwick A. Trujillo, William M. Grundy et Jay K. Kueny annoncent la découverte, sur des images prises par Lori Allen, David Herrera et David James entre le 23 et le dans le cadre du DECam NEO Survey, que (554099) 2012 KU50 est un système binaire. La séparation angulaire moyenne était de 1,37 seconde d'arc, indiquant une séparation d'au moins 30 000 kilomètres entre les deux composantes et donc un demi-grand axe d'au moins 15 000 kilomètres pour leur orbite mutuelle[5].

Références

  1. a et b (en) Caractéristiques et simulation d'orbite de 554099 dans la JPL Small-Body Database.
  2. a b et c (en) Michael E. Brown, « How many dwarf planets are there in the outer solar system? (updates daily) », California Institute of Technology (consulté le )
  3. a b et c (en) « Liste des objets transneptuniens », sur www.johnstonsarchive.net, (consulté le )
  4. (en) « Liste des objets transneptuniens », sur Minor Planet Center
  5. (en) « CBET 5075: (554099) 2012 KU_50 »,

Annexes

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Liens externes


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