(9307) Regiomontanus Main-belt Asteroid
Discovered on 21 August 1987 by F. Borngen at Tautenburg.
Named for the German mathematician and astronomer Johannes Regiomontanus (1436-1476), originally called J. Müller, one of the most famous scholars of his time and trailblazer of the new world view. He improved mathematical methods and created modern trigonometry. He was sure that calculations of the orbits of celestial bodies could be improved essentially by new, more exact systematic observations. So in 1472 he founded the first German observatory in Nürnberg. His plan was interrupted by his early death. Calendars and ephemeris he calculated and published helped the sailors Columbus, da Gama and Vespucci.Naming citation (19990202/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Regiomontanus is today
Seen from above the solar system on 2026-10-14: Regiomontanus is 2.07 au from the Sun and 2.30 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 9307 |
| Provisional designation | 1987 QS |
| Orbit class | Main-belt Asteroid |
| Diameter | 2.91 km (#15,426 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.525 |
| Absolute magnitude (H) | 14.56 |
| Orbital period | 3.59 years |
| Semi-major axis | 2.35 au |
| Perihelion – aphelion | 2.01 – 2.69 au |
| Eccentricity | 0.144 |
| Inclination | 6.58° |
| Closest distance between its orbit and Earth's (MOID) | 0.995 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 21 August 1987
- (4038) Kristina
- (4342) Freud
- (4405) Otava
- (5108) Lubeck
- (6120) Anhalt
- (6595) Munizbarreto
- (7009) Hume
- (7400) Lenau
- (7401) Toynbee
- (7815) Dolon
- (14354) Kolesnikov
- (48415) Dehio