(12263) 1989 YA4

(12263) 1989 YA4
Caractéristiques orbitales
Époque (JJ 2458200,5)[1]
Établi sur 1 468 observ. couvrant 10372 jours (U = 0)
Demi-grand axe (a) 340,449 × 106 km[1]
(2,275 76 ua)
Périhélie (q) 292,777 × 106 km[1]
(1,957 09 ua)
Aphélie (Q) 388,120 × 106 km[1]
(2,594 42 ua)
Excentricité (e) 0,14[1]
Période de révolution (Prév) 1 253 j
(3,43 a)
Inclinaison (i) 0,33°[1]
Longitude du nœud ascendant (Ω) 259,12°[1]
Argument du périhélie (ω) 254,5°[1]
Anomalie moyenne (M0) 52,5°[1]
Catégorie Astéroïde de la ceinture principale[1],[2]
Caractéristiques physiques
Dimensions 3,480 km
Magnitude absolue (H) 14,6[1],[2]
Albédo (A) 0,231

Découverte
Date le [1],[2]
Découvert par Robert H. McNaught[1],[2]
Lieu Observatoire de Siding Spring (Australie)[2]
Désignation (12263) 1989 YA4[1],[2]

modifier

(12263) 1989 YA4 est un astéroïde de la ceinture principale d'astéroïdes de 3,480 km de diamètre découvert en 1989.

Description

(12263) 1989 YA4 a été découvert le à l'observatoire de Siding Spring, situé près de Coonabarabran, en Nouvelle-Galles du Sud, en Australie, par Robert H. McNaught.

Caractéristiques orbitales

L'orbite de cet astéroïde est caractérisée par un demi-grand axe de 2,28 UA, un périhélie de 1,96 UA, une excentricité de 0,14 et une inclinaison de 0,33° par rapport à l'écliptique[1]. Du fait de ces caractéristiques, à savoir un demi-grand axe compris entre 2 et 3,2 UA et un périhélie supérieur à 1,666 UA, il est classé, selon la JPL Small-Body Database, comme objet de la ceinture principale d'astéroïdes[1].

Caractéristiques physiques

(12263) 1989 YA4 a une magnitude absolue (H) de 14,6 et un albédo estimé à 0,231, ce qui permet de calculer un diamètre de 3,480 km. Ces résultats ont été obtenus grâce aux observations du Wide-Field Infrared Survey Explorer (WISE), un télescope spatial américain mis en orbite en 2009 et observant l'ensemble du ciel dans l'infrarouge, et publiés en 2011 dans un article présentant les premiers résultats concernant les astéroïdes de la ceinture principale[3].

Voir aussi

Articles connexes

Références

  1. ↑ a b c d e f g h i j k l m n o et p (en) « (12263) 1989 YA4 » [html], sur le site du Jet Propulsion Laboratory (consulté le )
  2. ↑ a b c d e et f (en) « (12263) 1989 YA4 » [html], sur le site du Centre des planètes mineures (consulté le )
  3. ↑ (en) Joseph R Masiero, A. K Mainzer, T. Grav, J.M. Bauer, R.M. Cutri, J. Dailey,P.R.M. Eisenhardt, R.S. McMillan, T.B. Spahr, M.F. Skrutskie, D. Tholen, R.G. Walker, E.L. Wright, E. DeBaun, D. Elsbury, T. Gautier, S. Gomillion, A. Wilkins, « Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters », The Astrophysical Journal, vol. 741, no 2,‎ (DOI 10.1088/0004-637X/741/2/68)


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