Hermione
121 Hermione (A872 JA)
📋 A written introduction is coming — for now this page shows official values only.
Physical data
- Diameter
- 209 km
- Rotation period
- 5.5513 hours
- Albedo
- 0.0482
- Absolute magnitude H
- 7.39 mag
- Spectral type (Tholen)
- C
- Spectral type (SMASS)
- Ch
Orbit
- Orbit class (JPL)
- OMB — Outer Main-belt Asteroid
- Semi-major axis
- 3.46 AU
- Eccentricity
- 0.124
- Inclination
- 7.57°
- Perihelion distance
- 3.03 AU
- Aphelion distance
- 3.89 AU
- Orbital period
- 2,350 days
- Perihelion passage
- JD 2461861.294
- Earth MOID
- 2.04 AU
Earth approach
- Potentially hazardous (PHA)
- No
- Near-Earth object (NEO)
- No
In everyday life
- About 209 km across — 52.3% of the 400 km Seoul–Busan expressway.
- One orbit takes about 2,350 Earth days (about 6.4 years).
- Sunlight needs about 29 minutes to reach it on average (semi-major axis 3.5 AU) — versus about 8 min 19 s to Earth.
Worked out from this object's official values.