Reference image
Object guide
Hygiea is one of the largest asteroids and a dark, carbonaceous body; recent work suggests it may be nearly spherical. Hygiea is approximately 430 km across.
How to observe Hygiea
Hygiea is generally a challenging visual target. Use a current ephemeris, dark skies, and image stacking when its angular size or brightness is insufficient for direct detail.
Scientific context
Useful scale comparisons are 0.034 Earth diameters, 0.012 g surface gravity, 5.558 Earth years per orbit. These values are rounded from the catalogue measurements shown on this page.
- Radius
- 215 km
- Diameter
- 430 km
- Mass
- 83,200,000,000,000,000,000 kg
- Mean density
- 1.999 g/cm³
- Surface gravity
- 0.12 m/s² (0.012 g)
- Orbital period
- 2,030 days (5.558 years)
0.034 Earth diameters0.012 g surface gravity5.558 Earth years per orbit
Source: NASA/JPL Small-Body Database (checked 2026-08-09). Values are rounded catalogue measurements.
Interactive orbit model
Aug 13, 2026, 22:251×
Calculated positions / separate exploration scales