(46580) Ryouichiirie Main-belt Asteroid
Discovered on 2 April 1992 by T. Seki at Geisei.
Ryouichi Irie (b. 1949) is a Japanese amateur astronomer in Toyooka city, Hyogo prefecture, and an independent discoverer of C/1988 P1 (Machholz). He is also an award-winning astro-photographer and exhibits his works widely. The name was suggested by M. Sugano.Naming citation (MPC batch dated 2013-07-22), IAU / Minor Planet Center, via NASA/JPL
Where Ryouichiirie is today
Seen from above the solar system on 2026-10-14: Ryouichiirie is 2.55 au from the Sun and 3.50 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 46580 |
| Provisional designation | 1992 GC |
| Orbit class | Main-belt Asteroid |
| Diameter | 4.28 km (#12,095 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.167 |
| Absolute magnitude (H) | 13.94 |
| Orbital period | 4.34 years |
| Semi-major axis | 2.66 au |
| Perihelion – aphelion | 2.31 – 3.01 au |
| Eccentricity | 0.131 |
| Inclination | 13.6° |
| Closest distance between its orbit and Earth's (MOID) | 1.32 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.