(8664) Grigorijrichters Main-belt Asteroid
Discovered on 10 April 1991 by E. F. Helin at Palomar.
Grigorij Richters (b. 1987) is a film director and producer, who has worked to increase awareness of the dangers of asteroid impacts on the Earth. In 2014 he founded ‘Asteroid Day’, a world-wide organization centered on identifying all dangerous NEOs and developing ways to avoid an impending catastrophe.Naming citation (WGSBN Bull. 3, #14, 7), IAU / Minor Planet Center, via NASA/JPL
Where Grigorijrichters is today
Seen from above the solar system on 2026-10-14: Grigorijrichters is 2.45 au from the Sun and 2.87 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 8664 |
| Provisional designation | 1991 GR1 |
| Orbit class | Main-belt Asteroid |
| Diameter | 4.23 km (#12,196 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.298 |
| Rotation period | 43.7 hours |
| Absolute magnitude (H) | 14.07 |
| Orbital period | 3.64 years |
| Semi-major axis | 2.37 au |
| Perihelion – aphelion | 2.14 – 2.60 au |
| Eccentricity | 0.0974 |
| Inclination | 7.07° |
| Closest distance between its orbit and Earth's (MOID) | 1.14 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.