(21182) Teshiogawa Main-belt Asteroid
Discovered on 12 March 1994 by Endate, K., Watanabe, K. at Kitami.
Teshiogawa is a 256-km long river which runs through the northern part of Hokkaido into the Sea of Japan. Nayoro Observatory, equipped with the 1.6-m Pirka telescope, is located near this river.Naming citation (MPC batch dated 2024-11-15), IAU / Minor Planet Center, via NASA/JPL
Where Teshiogawa is today
Seen from above the solar system on 2026-10-14: Teshiogawa is 2.66 au from the Sun and 3.10 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21182 |
| Provisional designation | 1994 EC2 |
| Orbit class | Main-belt Asteroid |
| Diameter | 4.23 km (#12,195 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.431 |
| Rotation period | 10.1 hours |
| Absolute magnitude (H) | 13.66 |
| Orbital period | 3.47 years |
| Semi-major axis | 2.29 au |
| Perihelion – aphelion | 1.71 – 2.88 au |
| Eccentricity | 0.255 |
| Inclination | 25.2° |
| Closest distance between its orbit and Earth's (MOID) | 0.756 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.