5357 Sekiguchi
| Discovery | |
|---|---|
| Discovered by |
T. Fujii K. Watanabe |
| Discovery site | Kitami Obs. |
| Discovery date | 2 March 1992 |
| Designations | |
| MPC designation | (5357) Sekiguchi |
|
Named after
|
Tomohiko Sekiguch (astronomer) |
| 1992 EL · 1969 TB4 1971 BE3 · 1981 BH 1990 VJ4 · 1990 WU13 |
|
| main-belt · (outer) | |
| Orbital characteristics | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 65.89 yr (24,066 days) |
| Aphelion | 3.2971 AU |
| Perihelion | 2.6793 AU |
| 2.9882 AU | |
| Eccentricity | 0.1034 |
| 5.17 yr (1,887 days) | |
| 37.449° | |
| 0° 11m 26.88s / day | |
| Inclination | 9.0837° |
| 301.97° | |
| 116.81° | |
| Physical characteristics | |
| Dimensions |
13.948±0.118 14.281±0.193 km 14.52±0.65 km 15.19±1.13 km 25.44 km (calculated) |
|
5.4048±0.0011 h 5.4100±0.0011 h 5.41±0.01 h |
|
| 0.057 (assumed) 0.192±0.032 0.334±0.052 0.3829±0.0259 |
|
| C | |
| 11.7 · 10.9 · 11.60 · 11.66±0.17 · 11.719±0.003 (R) · 11.624±0.002 (R) | |
5357 Sekiguchi, provisional designation 1992 EL, is an asteroid from the outer region of the asteroid belt, approximately 15 kilometers in diameter. It was discovered on 2 March 1992, by Japanese amateur astronomers Tetsuya Fujii and Kazuro Watanabe at the Kitami Observatory in eastern Hokkaidō, Japan.
The asteroid orbits the Sun at a distance of 2.7–3.3 AU once every 5 years and 2 months (1,887 days). Its orbit has an eccentricity of 0.10 and an inclination of 9° with respect to the ecliptic. The first precovery was obtained at Goethe Link Observatory in 1950, extending the asteroid's observation arc by 42 years prior to its discovery.
A rotational light-curve of this asteroid was obtained by French astronomers René Roy and Laurent Bernasconi from photometric observations made in October 2005. It showed a rotation period of 5.41±0.01 hours with a brightness variation of 0.72 in magnitude (U=3). In October 2010 and November 2011, two more light-curves were obtained at the U.S. Palomar Transient Factory, rendering a period of 5.4048 and 5.4100 hours with an amplitude of 0.58 and 0.27 in magnitude, respectively (U=2/2).
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