Helga
522 Helga (A904 AF)
📋 A written introduction is coming — for now this page shows official values only.
Physical data
- Diameter
- 101.22 km
- Rotation period
- 8.129 hours
- Albedo
- 0.0388
- Absolute magnitude H
- 9.01 mag
- Spectral type (Tholen)
- X
Orbit
- Orbit class (JPL)
- OMB — Outer Main-belt Asteroid
- Semi-major axis
- 3.63 AU
- Eccentricity
- 0.0858
- Inclination
- 4.42°
- Perihelion distance
- 3.32 AU
- Aphelion distance
- 3.94 AU
- Orbital period
- 2,520 days
- Perihelion passage
- JD 2461263.729
- Earth MOID
- 2.32 AU
Earth approach
- Potentially hazardous (PHA)
- No
- Near-Earth object (NEO)
- No
In everyday life
- About 101 km across — 25.3% of the 400 km Seoul–Busan expressway.
- One orbit takes about 2,520 Earth days (about 6.9 years).
- Sunlight needs about 30 minutes to reach it on average (semi-major axis 3.6 AU) — versus about 8 min 19 s to Earth.
Worked out from this object's official values.