- Distance from Earth now
- 5.877 AU (879.1 million km)
- Distance from the Sun now
- 5.308 AU (794.1 million km)
- Light time from Earth
- 48 min 53 s
- Mean radius
- 69,911 km (10.973 × Earth)
- Mass
- 1.898 × 10^27 kg
- Surface gravity
- 25.92 m/s² (2.64 g)
- Escape velocity
- 60.2 km/s
- Rotation period
- 9.9 hours
- Year (orbit around the Sun)
- 11.86 years (4,333 days)
- Average distance (semi-major axis)
- 5.203 AU (778.3 million km)
- Orbital eccentricity
- 0.0483
- Inclination to the ecliptic
- 1.30°
- Next closest approach to Earth
- 10 February 2027 — 4.361 AU (652.4 million km)
Positions from NASA JPL Horizons; physical constants from the IAU and JPL. Distances are centre to centre.