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50000 Quaoar



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50000 Quaoar
Quaoar PRC2002-17e.jpg
Sum of 16 Hubble exposures registered on Quaoar.
Discovery[1]
Discovered byChad Trujillo, Michael Brown
Discovery date2002 Jun 05 10:48:08 PDT on an image taken 2002 June 04 05:41:40 UT
Designations
2002 LM60
Cubewano[2][3]
Orbital characteristics[4]
Epoch May 18, 2008 (JD 2 454 600.5)
Aphelion6.716 275 Tm (45.286 AU)
Perihelion6.270 316 Tm (41.928 AU)
6.493 296 Tm (43.607 AU)
Eccentricity0.038 4
105 181.6 d (287.97 a)
4.52 km/s
284.861°
Inclination7.988°
188.893°
148.508°
Physical characteristics
Dimensions1260 ± 190 km (direct)[5]
844+207−190 km (thermal)[6]
Mass(1.0–2.6)×1021 kg
Mean density
2.0? g/cm³
Equatorial surface gravity
0.276–0.376 m/s²
Equatorial escape velocity
0.523–0.712 km/s
0.088 +0.021−0.012 [5]
0.198 6 +0.13−0.07 [6]
Temperature~43 K
(moderately red) B-V=0.94, V-R=0.65
2.6

50000 Quaoar is a Trans-Neptunian object and is also a dwarf planet. It was discovered on June 4, 2002 by Chad Trujillo and Michael Brown at the California Institute of Technology.

References

  1. "Frequently Asked Questions About Quaoar". http://www.chadtrujillo.com/quaoar/. 
  2. Buie, Marc W. (2006-05-17). "Orbit Fit and Astrometric record for 50000". SwRI (Space Science Department). http://www.boulder.swri.edu/~buie/kbo/astrom/50000.html. 
  3. Marsden, Brian G. (2008-07-17). "MPEC 2008-O05 : Distant Minor Planets (2008 Aug. 2.0 TT)". IAU Minor Planet Center. Harvard-Smithsonian Center for Astrophysics. http://cfa-www.harvard.edu/iau/mpec/K08/K08O05.html. 
  4. "Asteroid Data Services by Lowell Observatory". http://asteroid.lowell.edu/. 
  5. 5.0 5.1 Brown, Michael E. and Chadwick A. Trujillo (2004). "Direct Measurement of the Size of the Large Kuiper Belt Object (50000) Quaoar". The Astronomical Journal 127 (7018): 2413–2417. doi:10.1086/382513 .  Reprint on Brown's site (pdf)
  6. 6.0 6.1 Stansberry J., Grundy W., Brown M, Cruikshank D., Spencer J., Trilling D., Margot J-L Physical Properties of Kuiper Belt and Centaur Objects: Constraints from Spitzer Space Telescope To Appear in: Kuiper Belt (M.A. Barucci et al., Eds.) U. Arizona Press, 2007 Preprint

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