(9861) Jahreiss Main-belt Asteroid
Discovered on 9 September 1991 by Schmadel, L. D., Borngen, F. at Tautenburg.
Hartmut Jahreiß (b. 1942) is a staff astronomer at the Astronomisches Rechen-Institut. As a successor of W. Gliese, he contributed much to our knowledge of the nearby stars. He also played a leading role in the construction of the HIPPARCOS Input Catalogue, as well as the FK5 and FK6.Naming citation (20010509/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Jahreiss is today
Seen from above the solar system on 2026-10-14: Jahreiss is 2.55 au from the Sun and 3.52 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 9861 |
| Provisional designation | 1991 RB3 |
| Orbit class | Main-belt Asteroid |
| Diameter | 2.92 km (#15,403 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.299 |
| Absolute magnitude (H) | 15.05 |
| Orbital period | 3.32 years |
| Semi-major axis | 2.23 au |
| Perihelion – aphelion | 1.90 – 2.55 au |
| Eccentricity | 0.145 |
| Inclination | 2.93° |
| Closest distance between its orbit and Earth's (MOID) | 0.910 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Hartmut
All asteroids named after someone called Hartmut
Also discovered on 9 September 1991
- (5689) Rhon
- (6043) Aurochs
- (6157) Prey
- (7127) Stifter
- (10095) Carlloewe
- (13530) Ninnemann
- (14412) Wolflojewski
- (16544) Hochlehnert
- (19178) Walterbothe
- (29208) Halorentz
- (32821) Posch
- (42487) Angstrom