(9825) Oetken Main-belt Asteroid
Discovered on 17 October 1977 by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T. at Palomar.
Lore Oetken (b. 1929) has made significant contributions to the fields of magnetic stars, polarimetry and spectroscopy, a prominent part of the astronomical research at the Potsdam Observatory. The citation was prepared by A. Schnell.Naming citation (20001111/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Oetken is today
Seen from above the solar system on 2026-10-14: Oetken is 3.24 au from the Sun and 4.20 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 9825 |
| Provisional designation | 1214 T-3 |
| Orbit class | Main-belt Asteroid |
| Diameter | 9.68 km (#5,289 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.131 |
| Absolute magnitude (H) | 12.86 |
| Orbital period | 5.20 years |
| Semi-major axis | 3.00 au |
| Perihelion – aphelion | 2.71 – 3.29 au |
| Eccentricity | 0.0978 |
| Inclination | 9.11° |
| Closest distance between its orbit and Earth's (MOID) | 1.73 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 17 October 1977
- (4043) Perolof
- (6147) Straub
- (7447) Marcusaurelius
- (7854) Laotse
- (8440) Wigeon
- (10981) Fransaris
- (11773) Schouten
- (11774) Jerne
- (12648) Ibarbourou
- (34978) van 't Hoff
- (55701) Ukalegon
- (55702) Thymoitos