(220736) Niihama Main-belt Asteroid
Discovered on 11 October 2004 by Hori, H., Maeno, H. at Nakagawa.
Niihama is the third-largest city in Ehime prefecture with a population of 125000. Established in 1937, it is famous for its copper mine and annual festival. The first discoverer was born in this city.Naming citation (20121228/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Niihama is today
Seen from above the solar system on 2026-10-14: Niihama is 2.52 au from the Sun and 1.74 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 220736 |
| Provisional designation | 2004 TR16 |
| Orbit class | Main-belt Asteroid |
| Absolute magnitude (H) | 15.14 |
| Orbital period | 5.63 years |
| Semi-major axis | 3.17 au |
| Perihelion – aphelion | 2.41 – 3.92 au |
| Eccentricity | 0.240 |
| Inclination | 25.3° |
| Closest distance between its orbit and Earth's (MOID) | 1.47 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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