(2158) Tietjen Main-belt Asteroid
Discovered on 24 July 1933 by K. Reinmuth at Heidelberg.
Where Tietjen is today
Seen from above the solar system on 2026-10-14: Tietjen is 3.48 au from the Sun and 2.99 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 2158 |
| Provisional designation | 1933 OS |
| Orbit class | Main-belt Asteroid |
| Diameter | 22.7 km (#1,889 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0660 |
| Rotation period | 8.66 hours |
| Absolute magnitude (H) | 11.8 |
| Orbital period | 5.38 years |
| Semi-major axis | 3.07 au |
| Perihelion – aphelion | 2.52 – 3.62 au |
| Eccentricity | 0.180 |
| Inclination | 1.59° |
| Closest distance between its orbit and Earth's (MOID) | 1.50 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.