(5646) 1990 TR
| Discovery | |
|---|---|
| Discovered by |
S. Ueda H. Kaneda |
| Discovery site | Kushiro Obs. (399) |
| Discovery date | 11 October 1990 |
| Designations | |
| MPC designation | (5646) 1990 TR |
| 1990 TR | |
| Amor · NEO | |
| Orbital characteristics | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 26.75 yr (9,769 days) |
| Aphelion | 3.0792 AU |
| Perihelion | 1.2071 AU |
| 2.1431 AU | |
| Eccentricity | 0.4368 |
| 3.14 yr (1,146 days) | |
| 155.77° | |
| 0° 18m 50.76s / day | |
| Inclination | 7.9142° |
| 14.136° | |
| 335.68° | |
| Known satellites | 1 |
| Earth MOID | 0.2105 AU |
| Physical characteristics | |
| Dimensions |
2.03±0.52 km 2.30 km (derived) 2.50±0.05 km 2.723±0.525 km 4.3 km (dated) |
|
3.1999±0.0002 h 3.204±0.002 h 6.25 h |
|
| 0.18 (assumed) 0.19±0.03 0.454±0.194 0.65±0.43 0.66±0.42 |
|
|
SMASS = U Q · S · U |
|
| 14.3 · 15.00 · 15.4 · 15.45 · 15.67 | |
(5646) 1990 TR is a probable rare-type binaryasteroid classified as near-Earth object of the Amor group, approximately 2.3 kilometers in diameter. It was discovered on 11 October 1990, by Japanese astronomers Seiji Ueda and Hiroshi Kaneda at Kushiro Observatory (399) near Kushiro, in eastern Hokkaido, Japan.
The asteroid orbits the Sun at a distance of 1.2–3.1 AU once every 3 years and 2 months (1,146 days). Its orbit has an eccentricity of 0.44 and an inclination of 8° with respect to the ecliptic. The body's observation arc begins with its first observation at the Siding Spring Observatory, five months prior to its official discovery observation at Kushiro.
In December 2012, the so far best rated rotational lightcurve was obtained by American astronomer Brian Warner at his Palmer Divide Observatory in Colorado. Lightcurve analysis gave a rotation period of 3.1999 hours with a brightness variation of 0.12 magnitude (U=3). Photometric observations also gave a period of 19.47 hours for a probable asteroid moon, with a measured diameter-ratio of 0.18±0.02, which translates into a diameter of 400 meters for its moon.
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