List of Solar system objects by radius
Categories: Cleanup from July 2005 | Lists of Solar system objects
This is a list of Solar system objects by radius, in decreasing order.
In the case of the Sun, Jupiter, and Saturn, the volumetric mean radius is used. For mostly spherical objects (oblate) such as planets and large planetoids, the equatorial radius is used. For irregular objects, the radii along three axes are given.
The ordering is not the same as the order of a list of solar system objects by mass because some objects are denser than others. For instance Uranus is bigger than Neptune but less massive, and although Ganymede and Titan are larger than Mercury, they have less than half its mass.
Several new trans-Neptunian objects have been discovered of significant size. While their radius remains provisional due to the recency of discovery, and is generally expressed as a range, the approximate locations in this list are shown.
List
| Rank | Body | Mean Radius (km) | Mean Radius (vs. Earth) | Volume (billion km3) | Volume (vs. Earth) |
|---|---|---|---|---|---|
| 1 | Sun | 696,000 | 109.25 | 1412 million | 1,303,781 |
| 2 | Jupiter | 69,911 | 10.97 | 1,431,280 | 1321 |
| 3 | Saturn | 58,232 | 9.14 | 827,130 | 764 |
| 4 | Uranus | 25,362 | 3.98 | 68,330 | 63.1 |
| 5 | Neptune | 24,624 | 3.87 | 62,540 | 57.7 |
| 6 | Earth | 6371.0 | 1 | 1083.21 | 1 |
| 7 | Venus | 6051.8 | 95.0% | 928.43 | 85.7% |
| 8 | Mars | 3390.0 | 53.2% | 163.78 | 15.1% |
| 9 | Ganymede* | 2631.2 | 41.3% | 76.30 | 7.04% |
| 10 | Titan* | 2575 | 40.4% | 71.52 | 6.60% |
| 11 | Mercury | 2439.7 | 38.3% | 60.85 | 5.62% |
| 12 | Callisto* | 2410.3 | 37.8% | 58.65 | 5.41% |
| 13 | Io* | 1821.5 | 28.6% | 25.32 | 2.34% |
| 14 | Moon | 1737.1 | 27.3% | 21.968 | 2.03% |
| 15 | Europa* | 1511 | 24.5% | 15.93 | 1.47% |
| 16 | Triton* | 1353.4 | 21.2% | 10.38 | 0.96% |
| 17 | 2003 UB313*** | 1350 | |||
| 18 | Pluto | 1195 | 18.1% | 6.39 | 0.59% |
| 19 | 2003 EL61*** | ~800 | |||
| 20 | Titania** | 788.9 | 12.4% | 2.06 | 0.19% |
| 21 | Rhea** | 764 | 12.0% | 1.87 | 0.17% |
| 22 | Oberon* | 761.4 | 12.0% | 1.85 | 0.17% |
| 23 | 2005 FY9*** | 600-840 | |||
| 24 | 90377 Sedna*** | 590-900 | |||
| 25 | Iapetus* | 718 | 11.3% | 1.55 | 0.14% |
| 26 | 90482 Orcus*** | 420-940 | |||
| 27 | Charon* | 593 | 9.3% | 0.87 | 0.08% |
| 28 | Umbriel* | 584.7 | 9.2% | 0.84 | 0.08% |
| 28 | 50000 Quaoar* | 495-673 | |||
| 30 | Ariel** | 578.9 | 9.1% | 0.81 | 0.08% |
| 31 | Dione* | 560 | 8.8% | 0.73 | 0.07% |
| 32 | Tethys** | 530 | 8.3% | 0.624 | 0.06% |
| 33 | 20000 Varuna* | 530 | 8.3% | 0.624 | 0.06% |
| 34 | 2002 AW197*** | 485 | |||
| 35 | 1 Ceres** | 475 | 7.6% | 0.437 | 0.04% |
| 36 | 28978 Ixion* | 465 | 7.3% | 0.61 | 0.057% |
- * Using equatorial radius and assuming body is spherical
- ** Using three radii and assuming body is spheroid
- *** Radius is known only very approximately