(307261) 2002 MS4

2002 MS4
Denumiri alternative(307261) 2002 MS4
Tip obiectObiect transneptunian[1]
possible dwarf planet[*][[possible dwarf planet (astronomical object that is supposed to be a dwarf planet)|​]]
asteroid[1]  Modificați la Wikidata
Date generale
Descoperire18 iunie 2002 de C. Trujillo,
M. Brown
Nr. sateliți0
Caracteristicile orbitei
Semiaxa mare41,931 u.a.
Distanța la periheliu36,004 u.a.
Distanța la afeliu47,858
Excentricitatea0,14135
Argumentul periheliului213,2°
Perioada siderală271,53 ani
Înclinarea față de ecliptică17.693°
Longitudinea nodului ascendent216,086°
Anomalie medie210,108°
Date fizice
Diametru934±47km[2]
726±123[3]
Albedo5,1% (+3,6%/-2,2%)[2]
8,4% (+3%/-2%)[3]
Temperatura la suprafață43 K
Locul descopeririiObservatorul Palomar[1]  Modificați la Wikidata
Data descoperirii[1]  Modificați la Wikidata

(307261) 2002 MS4 este un obiect transneptunian (TNO) de dimensiuni mari, al doilea cel mai mare obiect din Sistemul Solar fără nume, după 2007 OR10. A fost descoperit în 2002 de Chad Trujillo și Michael E. Brown. Este clasificat ca un cubewano de către Minor Planet Center.[4]

Site-ul lui Mike Brown îl listează ca o planetă pitică „aproape cu siguranță”.[5] Telescopul spațial Spitzer i-a estimat diametrul la 726±123 km.[3] Echipa telescopului spațial Herschel l-a estimat ca fiind de 934±47 km, ceea ce îl face al zecelea cel mai mare TNO cunoscut momentan[2] și suficient de mare pentru a fi considerat planetă pitică conform definiției planetelor de către UAI.[6] Se află în prezent la 47,2 u.a. de Soare[7] și va ajunge la periheliu în jurul anului 2122.[8]

A fost observat de 46 de ori, cu imagini predescoperite încă din 1954.[8]

Referințe

  1. ^ a b c d JPL Small-Body Database, accesat în  
  2. ^ a b c 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”. arXiv:1204.0697Accesibil gratuit. 
  3. ^ a b 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
  4. ^ "MPEC 2009-P26 :Distant Minor Planets (2009 AUG. 17.0 TT)".
  5. ^ Michael E. Brown. „How many dwarf planets are there in the outer solar system? (updates daily)”. California Institute of Technology. Accesat în . 
  6. ^ O. Gingerich (). „The Path to Defining Planets” (PDF). Harvard-Smithsonian Center for Astrophysics and IAU EC Planet Definition Committee chair. Accesat în . 
  7. ^ „AstDyS 2002MS4 Ephemerides”. Department of Mathematics, University of Pisa, Italy. Arhivat din original la . Accesat în . 
  8. ^ a b "JPL Small-Body Database Browser: (2002 MS4)". 2008-05-03.

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