(12357) Toyako Main-belt Asteroid
Discovered on 16 September 1993 by Endate, K., Watanabe, K. at Kitami.
Lake Toya (Toyako) is part of Shikotsu-Toya National Park in Hokkaido.Naming citation (20080520/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Toyako is today
Seen from above the solar system on 2026-10-14: Toyako is 2.91 au from the Sun and 2.07 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 12357 |
| Provisional designation | 1993 ST1 |
| Orbit class | Main-belt Asteroid |
| Diameter | 14.5 km (#3,246 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0690 |
| Rotation period | 8.33 hours |
| Absolute magnitude (H) | 12.94 |
| Orbital period | 5.56 years |
| Semi-major axis | 3.14 au |
| Perihelion – aphelion | 2.87 – 3.40 au |
| Eccentricity | 0.0841 |
| Inclination | 11.2° |
| Closest distance between its orbit and Earth's (MOID) | 1.88 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 16 September 1993
- (6923) Borzacchini
- (6980) Kyusakamoto
- (8040) Utsumikazuhiko
- (8194) Satake
- (10138) Ohtanihiroshi
- (10559) Yukihisa
- (10821) Kimuratakeshi
- (10822) Yasunori
- (10823) Sakaguchi
- (16644) Otemaedaigaku
- (19228) Uemuraikuo
- (27815) Katsuhito