2391 Tomita
| Discovery | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 9 January 1957 |
| Designations | |
| MPC designation | (2391) Tomita |
|
Named after
|
Kōichirō Tomita (astronomer) |
| 1957 AA · 1929 VX 1938 BF · 1942 DF 1957 BA · 1977 KM 1978 PA4 · 1980 DC6 |
|
| main-belt · Nysa | |
| Orbital characteristics | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 87.04 yr (31,792 days) |
| Aphelion | 2.7678 AU |
| Perihelion | 2.1140 AU |
| 2.4409 AU | |
| Eccentricity | 0.1339 |
| 3.81 yr (1,393 days) | |
| 293.37° | |
| 0° 15m 30.6s / day | |
| Inclination | 3.0112° |
| 163.32° | |
| 282.66° | |
| Physical characteristics | |
| Dimensions | 9.17 km (calculated) 16.62±0.23 km 17.941±0.129 19.412±0.175 km |
|
7.9533±0.0005 h 8.435±0.079 h |
|
|
0.0321±0.0044 0.070±0.004 0.21 (assumed) |
|
| S · C | |
| 12.4 · 12.5 · 12.74±0.28 | |
2391 Tomita, provisional designation 1957 AA, is a Nysian asteroid from the inner regions of the asteroid belt, approximately 10–20 kilometers in diameter. It was discovered on 9 January 1957, by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany.
The asteroid is a member of the Nysa family, which is named after its most massive member 44 Nysa. While the Collaborative Asteroid Lightcurve Link (CALL) classifies this body as a stony S-type asteroid, it is considered to be a carbonaceous C-type asteroid by Pan-STARRS large-scale survey. It orbits the Sun at a distance of 2.1–2.8 AU once every 3 years and 10 months (1,393 days). Its orbit has an eccentricity of 0.13 and an inclination of 3° with respect to the ecliptic. The first precovery was taken at Lowell Observatory in 1929, extending the asteroid's observation arc by 28 years prior to its discovery.
According to the surveys carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures between 16.6 and 19.4 kilometers in diameter and its surface has a low albedo between 0.03 and 0.07, respectively. As CALL considers the body to be of a stony composition, it assumes a much higher albedo of 0.21 and calculates a diameter of 9.2 kilometers, as the higher the asteroid's reflectivity (albedo), the shorter its diameter at a constant absolute magnitude (brightness).
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