Hesperia
69 Hesperia (A861 HC)
📋 A written introduction is coming — for now this page shows official values only.
Physical data
- Diameter
- 138.13 km
- Rotation period
- 5.655 hours
- Albedo
- 0.1402
- Absolute magnitude H
- 7.21 mag
- Spectral type (Tholen)
- M
- Spectral type (SMASS)
- X
Orbit
- Orbit class (JPL)
- MBA — Main-belt Asteroid
- Semi-major axis
- 2.98 AU
- Eccentricity
- 0.169
- Inclination
- 8.59°
- Perihelion distance
- 2.47 AU
- Aphelion distance
- 3.48 AU
- Orbital period
- 1,880 days
- Perihelion passage
- JD 2460777.504
- Earth MOID
- 1.51 AU
Earth approach
- Potentially hazardous (PHA)
- No
- Near-Earth object (NEO)
- No
In everyday life
- About 138 km across — 34.5% of the 400 km Seoul–Busan expressway.
- One orbit takes about 1,880 Earth days (about 5.1 years).
- Sunlight needs about 25 minutes to reach it on average (semi-major axis 3 AU) — versus about 8 min 19 s to Earth.
Worked out from this object's official values.