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50000 Quaoar

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50000 Quaoar
Sum of 16 Hubble exposures registered on Quaoar.
Sum of 16 Hubble exposures registered on Quaoar.
Discovery[1] and designation
Discovered by Chad Trujillo, Michael Brown
Discovery time 2002 Jun 05 10:48:08 PDT on an image taken 2002 June 04 05:41:40 UT
Other names 2002 LM60
Group Cubewano[2][3]
Reference date May 18, 2008 (JD 2 454 600.5)
Longest distance from the Sun 6.716 275 Tm (45.286 AU)
Shortest distance from the Sun 6.270 316 Tm (41.928 AU)
Longest distance from the center of its orbital path
("semi-major axis")
6.493 296 Tm (43.607 AU)
How egg-shaped its orbit is
0.038 4
How long it takes to complete an orbit 105 181.6 d (287.97 a)
Average speed 4.52 km/s
Mean anomaly 284.861°
Angle above the reference plane
Longitude of where it comes up through the reference plane 188.893°
Angle between its shortest distance from what it orbits around and where it comes up through the reference plane
("argument of periapsis")
Size and Other Qualities

1260 ± 190 km (direct)[5]

844+207−190 km (thermal)[6]
Mass (1.0–2.6)×1021 kg
Average density 2.0? g/cm³
Gravity at its surface 0.276–0.376 m/s²
Slowest speed able to escape into space
("escape velocity")
0.523–0.712 km/s
How much light it reflects

0.088 +0.021−0.012 [5]

0.198 6 +0.13−0.07 [6]
Avg. surface temp. ~43 K
Light-band group
("spectral type")
(moderately red) B-V=0.94, V-R=0.65
True brightness
("absolute magnitude")

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


  1. Frequently Asked Questions About Quaoar Archived 17 January 2010 at WebCite
  2. Buie, Marc W. (2006-05-17). "Orbit Fit and Astrometric record for 50000". SwRI (Space Science Department). Retrieved 2008-09-19.
  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. Archived from the original on 2012-04-09. Retrieved 2008-10-01.
  4. Asteroid Data Services by Lowell Observatory Archived 20 June 2007 at WebCite
  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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