(12365) Yoshitoki Main-belt Asteroid
Discovered on 17 December 1993 by T. Kobayashi at Oizumi.
Takahashi Yoshitoki (1764-1804) was chief of the Edo National Astronomical Observatory at Edo, Japan, from 1795 to 1804. He mainly studied positional astronomy, devising a new calendar computation method, “Kansei reki”, with Hazama Shigetomi.Naming citation (20020921/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Yoshitoki is today
Seen from above the solar system on 2026-10-14: Yoshitoki is 3.27 au from the Sun and 2.32 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 12365 |
| Provisional designation | 1993 YD |
| Orbit class | Main-belt Asteroid |
| Diameter | 27.5 km (#1,516 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0194 |
| Absolute magnitude (H) | 12.95 |
| Orbital period | 5.65 years |
| Semi-major axis | 3.17 au |
| Perihelion – aphelion | 3.06 – 3.28 au |
| Eccentricity | 0.0346 |
| Inclination | 14.8° |
| Closest distance between its orbit and Earth's (MOID) | 2.11 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.