(43857) Tanijinzan Main-belt Asteroid
Discovered on 15 November 1993 by T. Seki at Geisei.
Tani Jinzan (1663–1718) was an Edo-period astronomer and calendrical scholar in Tosa (modern-day Kochi prefecture). In 1694, using his accurate observations of the Sun, Moon, and constellations, he determined the latitude of Kochi Castle to be 33 and a half degrees north.Naming citation (WGSBN Bull. 1, #12, 8), IAU / Minor Planet Center, via NASA/JPL
Where Tanijinzan is today
Seen from above the solar system on 2026-10-14: Tanijinzan is 2.82 au from the Sun and 2.76 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 43857 |
| Provisional designation | 1993 VP2 |
| Orbit class | Main-belt Asteroid |
| Diameter | 13.2 km (#3,639 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0440 |
| Rotation period | 545 hours |
| Absolute magnitude (H) | 13.22 |
| Orbital period | 4.64 years |
| Semi-major axis | 2.78 au |
| Perihelion – aphelion | 2.28 – 3.28 au |
| Eccentricity | 0.181 |
| Inclination | 22.6° |
| Closest distance between its orbit and Earth's (MOID) | 1.35 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.