Sylvia
87 Sylvia (A866 KA)
📋 A written introduction is coming — for now this page shows official values only.
Physical data
- Diameter
- 253.051 km
- Rotation period
- 5.184 hours
- Albedo
- 0.046
- Absolute magnitude H
- 6.93 mag
- Spectral type (Tholen)
- P
- Spectral type (SMASS)
- X
Orbit
- Orbit class (JPL)
- OMB — Outer Main-belt Asteroid
- Semi-major axis
- 3.49 AU
- Eccentricity
- 0.0942
- Inclination
- 10.8°
- Perihelion distance
- 3.16 AU
- Aphelion distance
- 3.82 AU
- Orbital period
- 2,380 days
- Perihelion passage
- JD 2460380.434
- Earth MOID
- 2.18 AU
Earth approach
- Potentially hazardous (PHA)
- No
- Near-Earth object (NEO)
- No
In everyday life
- About 253 km across — 63.3% of the 400 km Seoul–Busan expressway.
- One orbit takes about 2,380 Earth days (about 6.5 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.