(31324) Jirimrazek Main-belt Asteroid
Discovered on 27 April 1998 by L. Sarounova at Ondrejov.
Jiří Mrázek (1923-1978) was a Czech geophysicist specializing in ionospheric studies but with much wider interests in science, philosophy and classical music. A master of the popularization of astronautics, astronomy, computer science and related subjects, he was a TV and radio star until his untimely death.Naming citation (20020624/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Jirimrazek is today
Seen from above the solar system on 2026-10-14: Jirimrazek is 3.08 au from the Sun and 2.87 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 31324 |
| Provisional designation | 1998 HR31 |
| Orbit class | Main-belt Asteroid |
| Diameter | 5.95 km (#9,003 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.137 |
| Absolute magnitude (H) | 14.25 |
| Orbital period | 5.35 years |
| Semi-major axis | 3.06 au |
| Perihelion – aphelion | 3.00 – 3.12 au |
| Eccentricity | 0.0188 |
| Inclination | 9.80° |
| Closest distance between its orbit and Earth's (MOID) | 2.02 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.