5357 Sekiguchi
| Discovery [1] | |
|---|---|
| Discovered by | T. Fujii, K. Watanabe |
| Discovery site | Kitami Observatory |
| Discovery date | 2 March 1992 |
| Designations | |
| MPC designation | 5357 Sekiguchi |
|
Named after
|
Tomohiko Sekiguch (astronomer)[2] |
| 1992 EL · 1969 TB4 1971 BE3 · 1981 BH 1990 VJ4 · 1990 WU13 |
|
| main-belt · (outer) [3] | |
| Orbital characteristics [1] | |
| Epoch 27 June 2015 (JD 2457200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 65.76 yr (24,019 days) |
| Aphelion | 3.2997 AU |
| Perihelion | 2.6791 AU |
| 2.9894 AU | |
| Eccentricity | 0.1038 |
| 5.17 yr (1,888 days) | |
| 283.03° | |
| Inclination | 9.0836° |
| 301.98° | |
| 116.78° | |
| Physical characteristics | |
| Dimensions | 15.19±1.13 km[4] 14.281±0.193 km[5] 14.52±0.65 km[6] 25.44 km (calculated)[3] |
| 5.41±0.01 h[7] 5.4100±0.0126[8] |
|
| 0.334±0.052[4] 0.3829±0.0259[5] 0.192±0.032[6] 0.057 (assumed)[3] |
|
| C [3] | |
| 11.7[1] | |
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5357 Sekiguchi, provisional designation 1992 EL, is an asteroid from the outer region of the asteroid belt, about 15 kilometers in diameter. It was discovered on 2 March 1992, by the two Japanese amateur astronomers, Tetsuya Fujii and Kazuro Watanabe, at the Kitami Observatory in eastern Hokkaidō, Japan.[2]
The asteroid orbits the Sun at a distance of 2.7–3.3 AU once every 5 years and 2 months (1,888 days). Its orbit shows an eccentricity of 0.10 and is tilted by 9 degrees to the plane of the ecliptic. It has a rotation period of 5.41 hours[7][8] and a high albedo of 0.33 to 0.38, according to the surveys carried out by the Japanese Akari satellite and the U.S. Wide-field Infrared Survey Explorer,[4][5] while data from the NEOWISE mission gave a lower albedo of 0.19.[6] However, the Collaborative Asteroid Lightcurve Link (CALL) assumes the body's surface to be of a carbonaceous composition and classifies it as a dark C-type asteroid with a correspondingly much lower albedo of 0.06. As a consequence, CALL calculates a much larger diameter of 25 kilometers for the asteroid, as the lower the reflectivity (albedo), the larger a body's diameter, for a given brightness (absolute magnitude).[3]
Tomohiko Sekiguchi (b. 1970) has been an associate professor at Hokkaido University of Education since 2008. He made observations of minor bodies from ESO between 1998 and 2001.[2]
References
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<references />, or <references group="..." />External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
- 5357 Sekiguchi at the JPL Small-Body Database
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