10 Hygiea

Discovered 1849-04-12 · Annibale de Gasparis

Fourth-largest asteroid; nearly spherical — borderline dwarf planet

Mean Radius

217 km

Gravity

0.09 m/s²

Temperature

164 K (-109°C)

Orbital Period

2031.0 d

Distance

3.139 AU

Physical Properties

Mean Radius217 km

Mass8.6700 × 10^19 kg

Surface Gravity0.09 m/s²

Density2.060 g/cm³

Escape Velocity0.20 km/s

Mean Temperature164 K (-109°C)

Axial Tilt0.00°

Rotation Period13.83 h

AtmosphereNone

Ring SystemNone

Orbital Elements (J2000)

Semi-major Axis3.138800 AU

Eccentricity0.116810

Inclination3.8317°

Orbital Period2031.00 days

Asc. Node (Ω)283.19800°

Arg. Perihelion (ω)312.32000°

Mean Anomaly (M₀)114.22000°

Perihelion2.772 AU

Aphelion3.506 AU

Data Sources

Physical & orbital data: NASA/JPL Planetary Fact Sheets · Orbital elements: NASA JPL Horizons System (J2000 epoch)