4607 Seilandfarm
| Discovery | |
|---|---|
| Discovered by |
K. Endate K. Watanabe |
| Discovery site | Kitami Obs. |
| Discovery date | 25 November 1987 |
| Designations | |
| MPC designation | (4607) Seilandfarm |
|
Named after
|
Seilandfarm (Japanese farm) |
| 1987 WR · 1951 CK1 1975 EO4 |
|
| main-belt · (inner) | |
| Orbital characteristics | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 28.54 yr (10,424 days) |
| Aphelion | 2.3082 AU |
| Perihelion | 2.2189 AU |
| 2.2636 AU | |
| Eccentricity | 0.0197 |
| 3.41 yr (1,244 days) | |
| 167.66° | |
| 0° 17m 21.84s / day | |
| Inclination | 2.2524° |
| 250.50° | |
| 220.01° | |
| Known satellites | 1 |
| Physical characteristics | |
| Dimensions |
6.33±0.27 km 7.13 km (calculated) 7.389±0.115 km 7.482±0.136 |
|
3.9681±0.0002 h 3.9683±0.0001 h |
|
|
0.178±0.032 0.20 (assumed) 0.2239±0.0142 0.279±0.035 |
|
| SMASS = L · L | |
| 12.89±0.34 · 12.9 · 13.00 · 13.1 · 13.2 | |
4607 Seilandfarm, provisional designation 1987 WR, is a rare-type binaryasteroid from the inner regions of the asteroid belt, approximately 7 kilometers in diameter.
It was discovered on 25 November 1987, by Japanese amateur astronomers Kin Endate and Kazuro Watanabe at Kitami Observatory on the Japanese island of Hokkaidō. It was named for a dairy and cattle farm with the same name, located near the Japanese city of Kitami.
The reddish body is classified as a rare L-type asteroid on the SMASS taxonomic scheme. It orbits the Sun at a distance of 2.2–2.3 AU once every 3 years and 5 months (1,244 days). Its orbit has an eccentricity of 0.02 and an inclination of 2° with respect to the ecliptic. The asteroid's observation arc begins with its discovery in 1987, as the first two observations at Abastuman, Georgia, and at Crimea–Nauchnij from 1954 and 1975, respectively, remain unused.
According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its NEOWISE mission, Seilandfarm measures between 6.3 and 7.5 and kilometers in diameter, and its surface has a corresponding albedo between 0.178 and 0.279, while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 7.1 kilometers, in agreement with the results obtained by the space-based observations.
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