(801) Helwerthia Main-belt Asteroid
Discovered on 20 March 1915 by M. F. Wolf at Heidelberg.
Where Helwerthia is today
Seen from above the solar system on 2026-10-14: Helwerthia is 2.80 au from the Sun and 1.90 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 801 |
| Provisional designation | A915 FH |
| Orbit class | Main-belt Asteroid |
| Diameter | 32.4 km (#1,258 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0310 |
| Rotation period | 23.9 hours |
| Spectral type | XC |
| Absolute magnitude (H) | 11.57 |
| Orbital period | 4.20 years |
| Semi-major axis | 2.60 au |
| Perihelion – aphelion | 2.40 – 2.81 au |
| Eccentricity | 0.0769 |
| Inclination | 14.1° |
| Closest distance between its orbit and Earth's (MOID) | 1.42 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.