Io
85 Io (A865 SA)
📋 A written introduction is coming — for now this page shows official values only.
Physical data
- Diameter
- 154.79 km
- Rotation period
- 6.875 hours
- Albedo
- 0.0666
- Absolute magnitude H
- 7.93 mag
- Spectral type (Tholen)
- FC
- Spectral type (SMASS)
- B
Orbit
- Orbit class (JPL)
- MBA — Main-belt Asteroid
- Semi-major axis
- 2.65 AU
- Eccentricity
- 0.193
- Inclination
- 12°
- Perihelion distance
- 2.14 AU
- Aphelion distance
- 3.17 AU
- Orbital period
- 1,580 days
- Perihelion passage
- JD 2460788.975
- Earth MOID
- 1.16 AU
Earth approach
- Potentially hazardous (PHA)
- No
- Near-Earth object (NEO)
- No
In everyday life
- About 155 km across — 38.7% of the 400 km Seoul–Busan expressway.
- One orbit takes about 1,580 Earth days (about 4.3 years).
- Sunlight needs about 22 minutes to reach it on average (semi-major axis 2.7 AU) — versus about 8 min 19 s to Earth.
Worked out from this object's official values.