List of dwarf planets of the solar system
This article contains a tabular overview of the known dwarf planets in the solar system . It contains the dwarf planets that are officially classified as dwarf planets according to the International Astronomical Union .
Official dwarf planets
| Surname | (1) Ceres | (134340) Pluto | (136108) Haumea | (136472) Makemake | (136199) Eris |
|---|---|---|---|---|---|
|
|
|
|
|
|
| Major semi-axis (in AU ) | 2.76800 | 39,482 | 43,307 | 45.763 | 67.689 |
| Numerical eccentricity | 0.0757825 | 0.2488 | 0.1894 | 0.1542 | 0.4421 |
| Orbital period (in sidereal years ) | 4.605 | 247.94 | 285.00 | 309.58 | 556.9 |
| Mean orbital speed (in km / s) | 17,882 | 4,668 | 4,487 | 4.377 | 3.433 |
| Orbit inclination | 10.59230 ° | 17.1417 ° | 28.195 ° | 28.999 ° | 44.143 ° |
|
Mean Equatorial diameter (in km) Rel. To the earth's moon |
975 0.28 |
2374 0.681 |
≈ 1920 × 1540 × 990 ≈ 0.55 × 0.44 × 0.28 |
1502 ± 45 0.43 |
2326 ± 12 0.669 |
|
Volume (in km³) Rel. To the moon |
4.52 x 10 8 0.021 |
6.97 · 10 9 0.32 |
≈ 1.53 · 10 9 ≈ 0.07 |
≈ 1.69 · 10 9 ≈ 0.08 |
6.59 · 10 9 0.30 |
|
Mass (in kg) relative to the moon |
9.5 x 10 20 0.013 |
1.303 · 10 22 0.178 |
4.01 · 10 21 0.055 |
≈ 2.99 · 10 21 ≈ 0.04 |
1.67 x 10 22 0.227 |
| Density (in g / cm³) | 2.077 | 1.86 | 2.57 | 1.7 | 2.52 |
| Gravitational field strength (in m / s² ) | 0.27 | 0.62 | ? | ≈ 0.45 | 0.83 |
| Escape speed (in km / s) | 0.51 | 1.21 | ? | ≈ 0.8 | 1.38 |
| Rotation period (in sidereal days ) | 0.3781 | 6,38718 | 0.16 (3 h 55 m) | ? | > 0.33? |
| Inclination of the equator to orbit | 4 ° | 119.61 ° | ? | ? | ? |
|
Surface temperature (in K ) min. / average / Max. |
? / 167/239 | 33/44/55 | ? /? /? | ? / 30 /? | ? / 30 /? |
| Main components of the atmosphere | ? | N 2 , CH 4 | ? | ? | ? |
| Number of known moons | 0 | 5 | 2 | 1 | 1 |
| Former planet status | Yes | Yes | No | No | No |
Dwarf planet candidate
In addition to the officially recognized dwarf planets, there are many other dwarf planet candidates that may meet the definitions for a dwarf planet, but for which the known data are not yet sufficient and that have not yet been classified as dwarf planets by the IAU.
| Surname | category | Diameter (km) | Mass (kg) | large HA ( AE ) |
|---|---|---|---|---|
| (225088) Gong gong | SDO or RKBO (10: 3) | 1230 ± 50 | ≈ 1.75 ± 0.07 · 10 21 | 67.38 |
| (50000) Quaoar | CKBO | 1110 ± 05 | 1:40 ± 0:10 · 10 21 | 43,440 |
| (90377) Sedna | Sednoid | 995 ± 80 | ≈ 1 · 10 21 | ≈ 500 |
| (307261) 2002 MS 4 | CKBO or SDO | 934 ± 47 | ? · 10 20 | 41.77 |
| (90482) Orcus | Plutino ( RKBO (3: 2)) | 917 ± 25 | 6.41 ± 0.19 · 10 20 | 39.455 |
| (120347) Salacia | CKBO or SDO | 854 ± 45 | 4.66 ± 0.22 · 10 20 | 41.86 |
| (55565) 2002 AW 197 | CKBO | 768 ± 38 | ? · 10 20 | 47.50 |
| (208996) 2003 AZ 84 | Plutino ( RKBO (3: 2)) | 727 ± 65 | ? · 10 20 | 39.60 |
| (174567) Varda | CKBO | 705 ± 75 | 2.65 ± 0.03 · 10 20 | 45.88 |
| (90568) 2004 GV 9 | CKBO or RKBO (5: 3) | 680 ± 34 | ? · 10 20 | 42.22 |
| (145452) 2005 RN 43 | CKBO | 679 + 55- 73 | ? · 10 20 | 41.379 |
| (20000) Varuna | CKBO | 668 +154- 86 | ? · 10 20 | 43,069 |
| (55637) 2002 UX 25 | CKBO | 665 ± 29 | 1.25 ± 0.03 · 10 20 | 42.55 |
| (28978) Ixion | Plutino ( RKBO (3: 2)) | 617 ± 19 | ? · 10 19 | 39.559 |
| (229762) Gǃkúnǁ'hòmdímà | SDO | 614 ± 15 | ? · 10 19 | 73.39 |
| (278361) 2007 JJ 43 | CKBO | 610 +170−140 | ? · 10 19 | 48.27 |
| (19521) Chaos | CKBO | 600 +140−130 | ? · 10 19 | 45.72 |
| (84522) 2002 TC 302 | RKBO (5: 2) | 584 +105.6- 88.0 | ? · 10 19 | 55.17 |
| (10) Hygiea | Branch Hygiea family | 434 ± 14 | 9 · 10 19 | 3.140 |
| almost safe dwarf planet |
| most likely dwarf planet |
| likely dwarf planet |
| possibly a dwarf planet |
See also
- List of moons of planets and dwarf planets
- List of the planets of the solar system
- List of asteroids
Web links
- List of dwarf planets and candidates by Michael E. Brown is updated regularly
Individual evidence
- ↑ a b c d JPL Small-Body Database Browser. Jet Propulsion Laboratory, accessed July 3, 2019 .