(9187) Walterkroll Main-belt Asteroid
Discovered on 12 September 1991 by Schmadel, L. D., Borngen, F. at Tautenburg.
Walter Kröll (b. 1938) served for 15 years as chairman of the German Aerospace Center DLR. Under his leadership he brought new spirit into German space research, stimulated achievements of excellence and contributed significantly to progress in space science on a global level. The name was suggested by the first discoverer.Naming citation (20010804/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Walterkroll is today
Seen from above the solar system on 2026-10-14: Walterkroll is 2.73 au from the Sun and 3.29 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 9187 |
| Provisional designation | 1991 RD4 |
| Orbit class | Main-belt Asteroid |
| Absolute magnitude (H) | 14.85 |
| Orbital period | 3.71 years |
| Semi-major axis | 2.40 au |
| Perihelion – aphelion | 1.91 – 2.88 au |
| Eccentricity | 0.202 |
| Inclination | 4.36° |
| Closest distance between its orbit and Earth's (MOID) | 0.900 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Walter
- (4588) Wislicenus
- (6318) Cronkite
- (7921) Huebner
- (8722) Schirra
- (9132) Walteranderson
- (9577) Gropius
- (9661) Hohmann
- (9696) Jaffe
- (11789) Kempowski
- (12158) Tape
- (15265) Ernsting
- (15968) Waltercugno
All asteroids named after someone called Walter
Also discovered on 12 September 1991
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- (9344) Klopstock
- (10782) Hittmair
- (21074) Rugen
- (21075) Heussinger
- (21076) Kokoschka
- (23490) Monikohl
- (24712) Boltzmann
- (24713) Ekrutt
- (27758) Michelson
- (46563) Oken
- (48456) Wilhelmwien