(307261) 2002 MS4

From Wikipedia, the free encyclopedia
Jump to: navigation, search
(307261) 2002 MS4
Discovered by Chad Trujillo,
Michael E. Brown
Discovery date 18 June 2002
MPC designation 2002 MS4
Alternative names none
Minor planet category Cubewano (MPC)[2]
ScatExt (DES)[3]
Orbital characteristics[4]
Epoch June 18, 2009 (2455000.5)
Aphelion 47.858 AU
(7159.4 Gm)
Perihelion 36.004 AU
(5386.1 Gm)
Semi-major axis 41.931 AU
(6272.7 Gm)
Eccentricity 0.14135
Orbital period 271.53 yr
Average orbital speed 4.58 km/s
Mean anomaly 210.108°
Inclination 17.693°
Longitude of ascending node 216.086°
Argument of perihelion 213.200°
Physical characteristics
Dimensions 934±47 km[5]
726±123 km[6]
Albedo 0.051+0.036
Temperature ≈43 K
Spectral type B−V=0.69;
Apparent magnitude 20.6[8]
Absolute magnitude (H) 3.8[4]

(307261) 2002 MS4 is a large trans-Neptunian object (TNO), the second-largest known object in the Solar system without a name after 2007 OR10. It was discovered in 2002 by Chad Trujillo and Michael E. Brown. It is classified as a cubewano by the Minor Planet Center.[2]

Mike Brown's website lists it as nearly certain to be a dwarf planet.[9] The Spitzer Space Telescope estimated it to have a diameter of 726±123 km.[6] The Herschel team estimates it to be 934±47 km, which would make it one of the 10 largest TNOs currently known,[5] and large enough to be considered a (dwarf) planet under the 2006 draft proposal of the IAU.[10] It is currently 47.2 AU from the Sun,[8] and will come to perihelion around 2122.[4]

It has been observed 46 times, with precovery images back to 1954.[4]


  1. ^ "MPEC 2002-W27 : 2002 MS4, 2002 QX47, 2002 VR128". IAU Minor Planet Center. 2002-11-21. Retrieved 2009-08-26. 
  2. ^ a b "MPEC 2009-P26 :Distant Minor Planets (2009 AUG. 17.0 TT)". IAU Minor Planet Center. 2009-08-07. Retrieved 2009-08-31. 
  3. ^ Marc W. Buie (2008-05-03 using 46 of 46 observations). "Orbit Fit and Astrometric record for 02MS4". SwRI (Space Science Department). Retrieved 2009-08-31. 
  4. ^ a b c d "JPL Small-Body Database Browser: (2002 MS4)". 2008-05-03 last obs. Retrieved 2009-08-24. 
  5. ^ a b c Vilenius, E., Kiss, C., Mommert, M. et al. (April 4, 2012). ""TNOs are Cool": A survey of the trans-Neptunian region VI. Herschel/PACS observations and thermal modeling of 19 classical Kuiper belt objects". Retrieved 2012-05-07. 
  6. ^ 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
  7. ^ Tegler, Stephen C. (2006-01-26). "Kuiper Belt Object Magnitudes and Surface Colors". Archived from the original on 1 September 2006. Retrieved 2006-11-05. 
  8. ^ a b "AstDyS 2002MS4 Ephemerides". Department of Mathematics, University of Pisa, Italy. Archived from the original on 2009-09-04. Retrieved 2009-08-27. 
  9. ^ Michael E. Brown. "How many dwarf planets are there in the outer solar system? (updates daily)". California Institute of Technology. Retrieved 2011-08-25. 
  10. ^ O. Gingerich (2006). "The Path to Defining Planets" (PDF). Harvard-Smithsonian Center for Astrophysics and IAU EC Planet Definition Committee chair. Retrieved 2007-03-13. 

External links[edit]