(20107) Nanyotenmondai Main-belt Asteroid
Discovered on 28 August 1995 by T. Okuni at Nanyo.
Nanyotenmondai (the Nanyo Citizens' Observatory) is located in the Sosyou park in the northern part of Nanyo city, Yamagata prefecture. The observatory was founded in 1986 and has been active in education and the popularization of astronomy.Naming citation (20060613/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Nanyotenmondai is today
Seen from above the solar system on 2026-10-14: Nanyotenmondai is 2.38 au from the Sun and 1.69 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 20107 |
| Provisional designation | 1995 QY3 |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.27 km (#14,553 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.315 |
| Absolute magnitude (H) | 14.65 |
| Orbital period | 3.88 years |
| Semi-major axis | 2.47 au |
| Perihelion – aphelion | 2.14 – 2.81 au |
| Eccentricity | 0.136 |
| Inclination | 4.99° |
| Closest distance between its orbit and Earth's (MOID) | 1.12 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.