(85) Io Main-belt Asteroid
Discovered on 19 September 1865 by C. H. F. Peters at Clinton.
👶 Io as a baby name🐶 Io as a dog name
Where Io is today
Seen from above the solar system on 2026-10-14: Io is 2.99 au from the Sun and 3.06 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 85 |
| Provisional designation | A865 SA |
| Orbit class | Main-belt Asteroid |
| Diameter | 155 km (#75 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0666 |
| Rotation period | 6.88 hours |
| Spectral type | FC |
| Absolute magnitude (H) | 7.93 |
| Orbital period | 4.32 years |
| Semi-major axis | 2.65 au |
| Perihelion – aphelion | 2.14 – 3.17 au |
| Eccentricity | 0.193 |
| Inclination | 12.0° |
| Closest distance between its orbit and Earth's (MOID) | 1.16 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
More named asteroids discovered by C. H. F. Peters
- (72) Feronia
- (75) Eurydike
- (77) Frigga
- (88) Thisbe
- (92) Undina
- (98) Ianthe
- (102) Miriam
- (109) Felicitas
- (111) Ate
- (112) Iphigenia
- (114) Kassandra
- (116) Sirona
← (84) Klio · (86) Semele →