Largest Dwarf-planet Candidates
These trans-Neptunian objects are theoretically large enough to be dwarf planets. Dozens of TNOs more could eventually be included, and perhaps three other asteroids. Both Quaoar and Orcus have known moons that have allowed the mass of the systems to be calculated. Both candidates are more massive than the 5×1020 kg recommendation of the IAU 2006 draft proposal.
| Orcus | Ixion | Varuna | 2005 UQ513 | Quaoar | 2002 TC302 | 2007 OR10 | 2007 UK126 | 2005 QU182 | Sedna | ||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Minor-planet number | 90482 | 28978 | 20000 | 202421 | 50000 | 84522 | 225088 | 229762 | 303775 | 90377 | |
| Semi-major axis | km AU |
5,896,946,000 39.419 |
5,935,999,000 39.68 |
6,451,398,000 43.13 |
6,479,089,380 43.31 |
6,493,296,000 43.6 |
8,264,380,000 55.24 |
10,072,433,340 67.33 |
11,032,000,000 73.74 |
16,991,749,800 113.58 |
78,668,000,000 525.86 |
| Mean radius | km :E |
473 0.0742 |
402 0.063 |
~350 0.06 |
460 0.072 |
422 0.066 |
~550 0.094 |
~600 0.10 |
440 0.07 |
525 0.08 |
~500 0.08 |
| Surface area | km² :E |
2,811,462 0.0055 |
2,030,775 0.00398 |
1,091,000 0.00636 |
2,659,044 0.0052 |
2,237,870 0.00439 |
4,521,600 0.00887 |
6,157,522 0.012 |
2,432,849 0.005 |
3,463,606 0.007 |
3,000,000 0.006 |
| Volume | km3 :E |
443,273,768 0.0004 |
272,123,951 0.0002 |
549,135,785 0.0005 |
407,720,083 0.0003 |
314,793,649 0.0002 |
904,320,000 0.0008 |
1,436,755,040 0.001 |
356,817,905 0.0002 |
606,131,033 0.0004 |
500,000,000 0.0005 |
| Mass | kg :E |
6.32×1020 0.0001 |
5.4×1020 0.00009 |
5.5×1020 0.00009 |
8.2×1020 0.0001 |
(1.3–1.9)×1021 0.0004 |
1.8×1021 0.0003 |
2.9×1021 0.0005 |
7.1×1020 0.0001 |
1.2×1021 0.0002 |
1×1021 0.00016 |
| Density | g/cm3 | 1.5±0.3 | 2.0 | 0.9992 | 2.0 | >2.8 | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 |
| Equatorial gravity | m/s2 | 0.27 | 0.22 | 0.14 | 0.26 | 0.24 | 0.34 | <0.39 | 0.25 | 0.29 | <0.5 |
| Escape velocity | km/s | 0.50 | 0.42 | 0.38 | 0.49 | 0.45 | 0.63 | <0.74 | 0.46 | 0.55 | <1.0 |
| Rotation period | days | ? | ? | 0.13216 | ? | ? | ? | ? | ? | ? | 0.42 |
| Orbital period | years | 247.492 | 249.95 | 283.20 | 285.12 | 287.97 | 410.62 | 552.52 | 633.28 | 1,210.53 | 12,059.06 |
| Mean orbital speed | km/s | 4.68 | 4.66 | 4.53 | 4.52 | 4.52 | 3.93 | 3.63 | 3.25 | 2.79 | 1.04 |
| Eccentricity | 0.22552 | 0.242 | 0.051 | 0.145 | 0.038 | 0.292 | 0.5 | 0.490 | 0.675 | 0.855 | |
| Inclination | deg. | 22.5 | 19.6 | 17.2 | 25.69 | 8 | 35 | 30.7 | 23.37 | 14.03 | 11.93 |
| Mean surface temperature | K | ~42 | ~43 | ~43 | ~41 | ~41 | ~38 | ~30 | ~32 | ~25 | ~12 |
| Number of known moons | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | |
| Planetary discriminant | 0.003 | 0.0027 | 0.0027 | 0.003 | 0.0015 | 0.335 | 0.18 | 0.036 | 0.007 | ? | |
| Absolute magnitude (H) | 2.30 | 3.20 | 3.70 | 3.40 | 2.71 | 3.8 | 1.7 | 3.40 | 3.40 | 1.58 | |
Read more about this topic: List Of Gravitationally Rounded Objects Of The Solar System
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