Object | 10 Hygiea | Ceres |
---|---|---|
Type | Dwarf planet | Dwarf planet |
Age | 4.5 billion years | 4.5 billion years |
Diameter | 434 km | 938 km |
Mean radius | 217 km | 469 km |
Mass | 8.32 × 1019 kg | 1.3 × 1022 kg |
Orbital period | 5.57 years | 4.6 years |
Rotation duration | 13 hours | 9 hours |
Surface temperature (average) |
164 K -109 °C -164 °F |
172 K -101 °C -150 °F |
Surface gravity | 0.091 m/s² | 0.28 m/s² |
Mean density | 1.94 g/cm3 | 2.16 g/cm3 |
Orbital distance | 469 million km | 419 million km |
Circumference | 1,363 km | 2,946 km |
Surface area | 0.59 million km² | 2.7 million km² |
Volume | 42.8 × 106 km3 | 4.3 × 108 km3 |
Escape velocity | 0.21 km/s | 1.21 km/s |
Average orbital speed | 16.76 km/s | 0.51 km/s |
Aphelion | 525 million km | 445 million km |
Perihelion | 413 million km | 382 million km |
Semi major axis | 469 million km | 414 million km |
Inclination | 3.83° | 10.59° |
Crust composition | silicate | water ice, silicate |
Distance from the Milky Way center | 27,200 light years | 27,200 light years |