(121) Hermione Outer Main-belt Asteroid
Discovered on 12 May 1872 by J. C. Watson at Ann Arbor.
👶 Hermione as a baby name🐶 Hermione as a dog name🐱 Hermione as a cat name
Where Hermione is today
Seen from above the solar system on 2026-10-14: Hermione is 3.45 au from the Sun and 3.86 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 121 |
| Provisional designation | A872 JA |
| Orbit class | Outer Main-belt Asteroid |
| Diameter | 209 km (#23 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0482 |
| Rotation period | 5.55 hours |
| Spectral type | C |
| Absolute magnitude (H) | 7.39 |
| Orbital period | 6.43 years |
| Semi-major axis | 3.46 au |
| Perihelion – aphelion | 3.03 – 3.89 au |
| Eccentricity | 0.124 |
| Inclination | 7.57° |
| Closest distance between its orbit and Earth's (MOID) | 2.04 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
More named asteroids discovered by J. C. Watson
- (79) Eurynome
- (93) Minerva
- (94) Aurora
- (100) Hekate
- (101) Helena
- (103) Hera
- (104) Klymene
- (105) Artemis
- (106) Dione
- (115) Thyra
- (119) Althaea
- (128) Nemesis
← (120) Lachesis · (122) Gerda →