(208351) Sielmann Main-belt Asteroid
Discovered on 8 September 2001 by A. Knofel at Drebach.
Heinz Sielmann (1917-2006) was a German wildlife photographer, zoologist and documentary filmmaker. He established a foundation (the Heinz Sielmann Stiftung), which has successfully reintroduced beavers and otters to Germany.Naming citation (20120207/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Sielmann is today
Seen from above the solar system on 2026-10-14: Sielmann is 3.64 au from the Sun and 4.56 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 208351 |
| Provisional designation | 2001 RO15 |
| Orbit class | Main-belt Asteroid |
| Diameter | 8.50 km (#6,151 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0350 |
| Absolute magnitude (H) | 14.96 |
| Orbital period | 5.59 years |
| Semi-major axis | 3.15 au |
| Perihelion – aphelion | 2.53 – 3.77 au |
| Eccentricity | 0.196 |
| Inclination | 25.3° |
| Closest distance between its orbit and Earth's (MOID) | 1.66 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Heinz
- (2350) von Lude
- (10908) Kallestroetzel
- (15762) Ruhmann
- (25142) Hopf
- (27506) Glassmeier
- (138445) Westenburger
- (663271) Heinzreinhardt
All asteroids named after someone called Heinz