50000 Quaoar
From Wikipedia, the free encyclopedia
 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 |
| Names | |
| Other names | 2002 LM60 |
| Group | Cubewano[2][3] |
| Orbit[4] | |
| 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 ("eccentricity") |
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 ("inclination") |
7.988° |
| 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") |
148.508° |
| Size and Other Qualities | |
| Measures |
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") |
2.6 |
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.
References[change | edit source]
- ↑ Frequently Asked Questions About Quaoar Archived 17 January 2010 at WebCite
- ↑ 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. Retrieved 2008-09-19.
- ↑ 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. http://cfa-www.harvard.edu/iau/mpec/K08/K08O05.html. Retrieved 2008-10-01.
- ↑ Asteroid Data Services by Lowell Observatory Archived 20 June 2007 at WebCite
- ↑ 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)
- ↑ 6.0 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
Other websites[change | edit source]
- Quaoar discoverers' webpage
- Orbital simulation from JPL (Java) /Ephemeris
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