(24984) Usui Main-belt Asteroid
Discovered on 27 May 1998 by LONEOS at Anderson Mesa.
Fumihiko Usui (b. 1974) is a research associate at the University of Tokyo. He played a central role in assembling the data catalog for more than 5000 asteroids measured in the infrared by the Akari satellite.Naming citation (MPC batch dated 2014-07-12), IAU / Minor Planet Center, via NASA/JPL
Where Usui is today
Seen from above the solar system on 2026-10-14: Usui is 2.06 au from the Sun and 1.43 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 24984 |
| Provisional designation | 1998 KQ42 |
| Orbit class | Main-belt Asteroid |
| Diameter | 2.54 km (#16,193 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.208 |
| Absolute magnitude (H) | 15.25 |
| Orbital period | 3.40 years |
| Semi-major axis | 2.26 au |
| Perihelion – aphelion | 1.69 – 2.83 au |
| Eccentricity | 0.253 |
| Inclination | 10.5° |
| Closest distance between its orbit and Earth's (MOID) | 0.678 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.