(31402) Negishi Main-belt Asteroid
Discovered on 7 January 1999 by T. Kobayashi at Oizumi.
Hiroyuki Negishi (b. 1964) is a Japanese amateur astronomer and a key member of the Ota Astronomical Club. A solar eclipse fanatic, he travels the world in pursuit of the missing sun.Naming citation (MPC batch dated 2014-08-10), IAU / Minor Planet Center, via NASA/JPL
Where Negishi is today
Seen from above the solar system on 2026-10-14: Negishi is 2.98 au from the Sun and 2.71 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 31402 |
| Provisional designation | 1999 AR |
| Orbit class | Main-belt Asteroid |
| Rotation period | 9.69 hours |
| Absolute magnitude (H) | 12.71 |
| Orbital period | 4.04 years |
| Semi-major axis | 2.53 au |
| Perihelion – aphelion | 2.08 – 2.99 au |
| Eccentricity | 0.178 |
| Inclination | 16.5° |
| Closest distance between its orbit and Earth's (MOID) | 1.10 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Hiroyuki
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- (9642) Takatahiro
- (11072) Hiraoka
- (11928) Akimotohiro
- (19392) Oyamada
- (27816) Naitohiroyuki
- (30925) Todahiroyuki
- (46649) Tsudahiroyuki
All asteroids named after someone called Hiroyuki