(307261) 2002 MS4

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**(307261) 2002 MS₄**
Discovery^[1]
Discovered by	Chad Trujillo, Michael E. Brown
Discovery date	18 June 2002
Designations
MPC designation	2002 MS₄
Alternate name(s)	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°
Proper orbital elements
Physical characteristics
Dimensions	934 ± 47 km^[5] 726 ± 123 km^[6]
Albedo	0.084+.03 −.02^[6] 0.051+.036 −.022^[5]
Temperature	~43 K
Spectral type	B-V=0.69; V-R=0.38^[7]
Apparent magnitude	20.6^[8]
Absolute magnitude (H)	3.79^[4]

(307261) 2002 MS₄ is a trans-Neptunian object (TNO). 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 highly likely a dwarf planet.^[9] The Spitzer Space Telescope has 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] 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]

References

^ "MPEC 2002-W27 : 2002 MS4, 2002 QX47, 2002 VR128". IAU Minor Planet Center. 2002-11-21. http://www.cfa.harvard.edu/mpec/K02/K02W27.html. Retrieved 2009-08-26.
^ ^a ^b "MPEC 2009-P26 :Distant Minor Planets (2009 AUG. 17.0 TT)". IAU Minor Planet Center. 2009-08-07. http://www.cfa.harvard.edu/mpec/K09/K09P26.html. 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). http://www.boulder.swri.edu/~buie/kbo/astrom/02MS4.html. Retrieved 2009-08-31.
^ ^a ^b ^c ^d "JPL Small-Body Database Browser: (2002 MS4)". 2008-05-03 last obs. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2002MS4. Retrieved 2009-08-24.
^ ^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". http://arxiv.org/pdf/1204.0697.pdf. Retrieved 2012-05-07.
^ ^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
^ Tegler, Stephen C. (2006-01-26). "Kuiper Belt Object Magnitudes and Surface Colors". Archived from the original on 01 September 2006. http://web.archive.org/web/20060901063349/http://www.physics.nau.edu/~tegler/research/survey.htm. Retrieved 2006-11-05.
^ ^a ^b "AstDyS 2002MS4 Ephemerides". Department of Mathematics, University of Pisa, Italy. Archived from the original on 2009-09-04. http://hamilton.dm.unipi.it/astdys/index.php?pc=1.1.3.0&n=2002MS4. Retrieved 2009-08-27.
^ Michael E. Brown. "How many dwarf planets are there in the outer solar system? (updates daily)". California Institute of Technology. http://www.gps.caltech.edu/~mbrown/dps.html. Retrieved 2011-08-25.

External links

Orbital simulation from JPL (Java) / Ephemeris
2002 MS4 Precovery Images

v t e Plutoids (Trans-Neptunian dwarf planets)

Kuiper belt	Pluto Makemake Haumea

Scattered disc	Eris

Kuiper-belt candidates	Orcus Quaoar Ixion 2002 AW₁₉₇ 2005 UQ₅₁₃ 2003 MW₁₂ 2002 UX₂₅ Varuna 2007 JJ₄₃ 2002 MS₄ 2005 RN₄₃ 2004 GV₉ 2003 VS₂ 2003 AZ₈₄ 2004 XA₁₉₂ 2010 RE₆₄ 2010 RF₄₃ Salacia 2004 PF₁₁₅

Scattered-disc candidates	2007 OR₁₀ 2007 UK₁₂₆ 2005 QU₁₈₂ 2006 QH₁₈₁ 2010 EK₁₃₉ 2002 TC₃₀₂ 2010 KZ₃₉ 2001 UR₁₆₃

Other candidates	Sedna

See also: Triton List of trans-Neptunian objects List of dwarf planet candidates List of Solar System objects List of Solar System objects by size

Small Solar System bodies

Minor planets

Designation Groups Moons Meanings of names Pronunciation of names

Asteroids	Aten asteroid Families Jupiter Trojans Main-belt Near-Earth Spectral types

Distant minor planets	Centaurs Damocloids Neptune trojans Trans-Neptunian objects Detached Kuiper belt Oort cloud Scattered disc

Comets

Meteoroids

Lists / categories

v t e Trans-Neptunian objects

TNO classes	Cubewanos Scattered-disc objects Detached objects Resonant objects (Neptune trojans Plutinos Twotinos) Natural satellites Double objects

Plutoids & moons	Pluto Haumea Makemake Eris Charon (Pluto I) Dysnomia (Eris I) Hi'iaka (Haumea I) Namaka (Haumea II)

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