1089 Tama
Lightcurve-based 3D-model of Tama | |
| Discovery | |
|---|---|
| Discovered by | O. Oikawa |
| Discovery site | Tokyo Astronomical Obs. |
| Discovery date | 17 November 1927 |
| Designations | |
| (1089) Tama | |
| Pronunciation | Japanese: [tama] |
Named after | Tama River (Japanese river) |
| 1927 WB · 1930 ST 1952 HE4 · A894 VA A904 VD · A919 HA | |
| main-belt · (inner) Flora · background | |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 122.40 yr (44,708 days) |
| Aphelion | 2.4951 AU |
| Perihelion | 1.9327 AU |
| 2.2139 AU | |
| Eccentricity | 0.1270 |
| 3.29 yr (1,203 days) | |
| 82.843° | |
| 0° 17m 57.12s / day | |
| Inclination | 3.7264° |
| 71.489° | |
| 354.29° | |
| Known satellites | 1 |
| Physical characteristics | |
| Dimensions | 11.33±2.00 km 12.2±1.6 km 12.82 km (derived) 12.92±0.6 km 13.08±0.37 km 13.082±0.373 km 13.32±0.19 km |
| 4 (dated)h 16.4±0.1 h 16.44 h 16.444±0.001 h 16.4442±0.0004 h 16.445±0.005 h 16.45±0.05 h 16.4530±0.0004 h 16.464±0.004 h 16.4655 h | |
| 0.2048 (derived) 0.216±0.029 0.2424±0.023 0.243±0.008 0.267±0.083 0.32±0.23 | |
| S (assumed) | |
| 11.60 · 11.63±0.0 · 11.70 · 11.8 · 11.86±0.85 | |
1089 Tama, provisional designation 1927 WB, is an elongated Florian asteroid and synchronous binary system from the inner regions of the asteroid belt, approximately 12 kilometers in diameter.
It was discovered by Japanese astronomer Okuro Oikawa at the old Tokyo Astronomical Observatory (389) on 17 November 1927. The asteroid was named after the Tama River in Japan. Its minor-planet moon was discovered in December 2003 and measures approximately 9 kilometers.