(9990) Niiyaeki Main-belt Asteroid
Discovered on 30 September 1997 by T. Okuni at Nanyo.
Niiya Eki is the name of the train station in Ozu city ( population 46000) Ehime Prefecture , Japan.Naming citation (MPC batch dated 2018-01-31), IAU / Minor Planet Center, via NASA/JPL
Where Niiyaeki is today
Seen from above the solar system on 2026-10-14: Niiyaeki is 2.80 au from the Sun and 2.07 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 9990 |
| Provisional designation | 1997 SO17 |
| Orbit class | Main-belt Asteroid |
| Diameter | 5.25 km (#10,149 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.307 |
| Absolute magnitude (H) | 13.77 |
| Orbital period | 4.76 years |
| Semi-major axis | 2.83 au |
| Perihelion – aphelion | 2.59 – 3.07 au |
| Eccentricity | 0.0853 |
| Inclination | 2.10° |
| Closest distance between its orbit and Earth's (MOID) | 1.58 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 30 September 1997
- (10894) Nakai
- (13691) Akie
- (15387) Hanazukayama
- (15906) Yoshikaneda
- (29458) Pearson
- (37786) Tokikonaruko
- (39795) Marson
- (46727) Hidekimatsuyama