(307261) 2002 MS4
|Discovered by||Chad Trujillo,
Michael E. Brown
|Discovery date||18 June 2002|
|MPC designation||2002 MS4|
|Minor planet category||Cubewano (MPC)
|Epoch June 18, 2009 (2455000.5)|
|Semi-major axis||41.931 AU
|Orbital period||271.53 yr|
|Average orbital speed||4.58 km/s|
|Longitude of ascending node||216.086°|
|Argument of perihelion||213.200°|
|Absolute magnitude (H)||3.8|
(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.
Mike Brown's website lists it as nearly certain to be a dwarf planet. The Spitzer Space Telescope estimated it to have a diameter of 726±123 km. The Herschel team estimates it to be 934±47 km, which would make it one of the 10 largest TNOs currently known, and easily large enough to be accepted as a dwarf planet under the 2006 draft proposal of the IAU. It is currently 47.2 AU from the Sun, and will come to perihelion around 2122.
- "MPEC 2002-W27 : 2002 MS4, 2002 QX47, 2002 VR128". IAU Minor Planet Center. 2002-11-21. Retrieved 2009-08-26.
- "MPEC 2009-P26 :Distant Minor Planets (2009 AUG. 17.0 TT)". IAU Minor Planet Center. 2009-08-07. Retrieved 2009-08-31.
- 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.
- "JPL Small-Body Database Browser: (2002 MS4)". 2008-05-03 last obs. Retrieved 2009-08-24.
- 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.
- Stansberry, Grundy, Brown, Spencer, Trilling, Cruikshank, Luc Margot Physical Properties of Kuiper Belt and Centaur Objects: Constraints from Spitzer Space Telescope (2007) Preprint arXiv
- 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.
- "AstDyS 2002MS4 Ephemerides". Department of Mathematics, University of Pisa, Italy. Archived from the original on 2009-09-04. Retrieved 2009-08-27.
- Michael E. Brown. "How many dwarf planets are there in the outer solar system? (updates daily)". California Institute of Technology. Retrieved 2011-08-25.
- 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.
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