(307261) 2002 MS4

(307261) 2002 MS4
Description de cette image, également commentée ci-après
(307261) 2002 MS4 photographié par Hubble le 9 avril 2006.
Caractéristiques orbitales
Époque 9 décembre 2014 (JJ 2457000,5)[1]
Établi sur 77 observ. couvrant 24188 jours (66 ans) (U = 3)
Demi-grand axe (a) 6,272 7 × 109 km
(41,63 ua)
Périhélie (q) 5,386 1 × 109 km
(35,53 ua)
Aphélie (Q) 7,159 4 × 109 km
(47,74 ua)
Excentricité (e) 0,146 6
Période de révolution (Prév) 98 140 ± 16 j
(268,69 a)
Vitesse orbitale moyenne (vorb) 4,58 km/s
Inclinaison (i) 17,693°
Longitude du nœud ascendant (Ω) 216,04°
Argument du périhélie (ω) 215,6°
Anomalie moyenne (M0) 214,66°
Catégorie Cubewano (MPC)[2]
Objet épars (DES)[3]
Satellites connus 0
Caractéristiques physiques
Dimensions 934 ± 47 km[4]
726 ± 123 km[5]
Classification spectrale B-V=0,69 ; V-R=0,38[6]
Magnitude absolue (H) 3,8[1]
Magnitude apparente (m) 20,6[7]
Albédo (A) 0,051+0,036
−0,022
[4]
0,084+0,03
−0,02
[5]
Température (T) ≈43 K
Découverte
Plus ancienne observation de pré-découverte
Date 18 juin 2002[8]
Découvert par Chadwick Trujillo,
Michael E. Brown
Lieu Palomar
Désignation 2002 MS4

(307261) 2002 MS4 est un gros objet transneptunien, classé comme planète naine potentielle.

Description

Il fut découvert en 2002 par Chadwick Trujillo et Michael E. Brown. Il est classé comme cubewano par le Centre des planètes mineures[2].

Le site web de Mike Brown le classe comme planète naine quasi certaine[9]. Le télescope spatial Spitzer a estimé son diamètre à 726 ± 123 km[5]. L'équipe d'Herschel l'estime quant à elle à 934 ± 47 km, ce qui en ferait un des dix plus grands objets transneptuniens actuellement connus[4], et largement assez grand pour être accepté comme planète naine selon la proposition provisoire de 2006 de l'UAI[10]. Il est actuellement à 47,2 UA du Soleil[7], et passera au périhélie autour de 2122[1].

Il a été observé 55 fois, avec des images de pré-découverte remontant à 1954[1].

Depuis le nommage de (225088) Gonggong le , 2002 MS4 est le plus gros objet connu du système solaire sans nom propre.

Compléments

Articles connexes

Liens externes

Bibliographie

  • F. L. Rommel et al., « A large topographic feature on the surface of the trans-Neptunian object (307261) 2002 MS4 measured from stellar occultations », Astronomy & Astrophysics,‎ (arXiv 2308.08062)

Références

  1. a b c et d (en) « JPL Small-Body Database Browser: (2002 MS4) », 3 mai 2008 last obs (consulté le )
  2. a et b (en) « MPEC 2009-P26 :Distant Minor Planets (2009 AUG. 17.0 TT) », IAU Minor Planet Center, (consulté le )
  3. (en) Marc W. Buie, « Orbit Fit and Astrometric record for 307261 », SwRI (Space Science Department), 3 mai 2008 using 46 of 46 observations (consulté le )
  4. a b et c (en) Vilenius, E., Kiss, C., Mommert, M. et al., « "TNOs are Cool": A survey of the trans-Neptunian region VI. Herschel/PACS observations and thermal modeling of 19 classical Kuiper belt objects », (consulté le )
  5. a b et c Stansberry, Grundy, Brown, Spencer, Trilling, Cruikshank, Luc Margot Physical Properties of Kuiper Belt and Centaur Objects: Constraints from Spitzer Space Telescope (2007) Preprint arXiv
  6. (en) Stephen C. Tegler, « Kuiper Belt Object Magnitudes and Surface Colors », (consulté le )
  7. a et b (en) « AstDyS 2002MS4 Ephemerides », Department of Mathematics, University of Pisa, Italy (consulté le )
  8. (en) « MPEC 2002-W27 : 2002 MS4, 2002 QX47, 2002 VR128 », IAU Minor Planet Center, (consulté le )
  9. (en) Michael E. Brown, « How many dwarf planets are there in the outer solar system? (updates daily) », California Institute of Technology (consulté le )
  10. (en) O. Gingerich, « The Path to Defining Planets » [PDF], Harvard-Smithsonian Center for Astrophysics and IAU EC Planet Definition Committee chair, (consulté le )


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