Hydra
Pluto 903 Hydra
📋 A written introduction is coming — for now this page shows official values only.
Physical data
- Mean radius
- 18.5 km
- GM
- 0.002 km³/s²
- Density
- 1.21 g/cm³
Source:NASA JPL Solar System Dynamics · checked 2026-11-02 ↗
Orbit
- Semi-major axis
- 65,200 km
- Eccentricity
- 0.009
- Inclination
- 0.3°
- Orbital period
- 38.2 days
- Retrograde
- No
Source:NASA JPL Solar System Dynamics · checked 2026-11-02 ↗
Related
Parent body
In everyday life
- About 37 km across — 9.3% of the 400 km Seoul–Busan expressway.
- One orbit takes about 38.2 Earth days.
- About 65,200 km from Pluto on average — 163 drives along the 400 km Seoul–Busan expressway.