(9942) 1989 TM1
| Discovery | |
|---|---|
| Discovered by | T. Hioki N. Kawasato |
| Discovery site | Okutama Obs. |
| Discovery date | 8 October 1989 |
| Designations | |
| (9942) 1989 TM1 | |
| 1989 TM1 | |
| main-belt · (middle) background | |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 26.64 yr (9,732 days) |
| Aphelion | 3.0287 AU |
| Perihelion | 2.1619 AU |
| 2.5953 AU | |
| Eccentricity | 0.1670 |
| 4.18 yr (1,527 days) | |
| 217.94° | |
| 0° 14m 8.52s / day | |
| Inclination | 9.9393° |
| 21.747° | |
| 38.492° | |
| Physical characteristics | |
| 4.12±0.45 km 4.73 km (calculated) | |
| 3.0706±0.0004 h | |
| 0.20 (assumed) 0.454±0.106 | |
| S (assumed) | |
| 13.40 · 13.541 13.6 · 13.99 | |
(9942) 1989 TM1 (provisional designation 1989 TM1) is a background asteroid from the central region of the asteroid belt, approximately 4.5 kilometers (2.8 miles) in diameter. It was discovered on 8 October 1989, by Japanese astronomers Nobuhiro Kawasato and Tsutomu Hioki at the Okutama Observatory (877) in Japan. The asteroid has a tentative rotation period of 3.1 hours.