(20636) Romanhirsch Main-belt Asteroid
Discovered on 2 October 1999 by LINEAR at Socorro.
Roman Hirsch (b. 1975) is a Polish astronomer working at the Astronomical Observatory Institute of Adam Mickiewicz University in Poznań. For many years, he has been involved in asteroid observations carried out at Borowiec Observatory and is currently involved in observations at the Nordic Optical Telescope, La Palma.Naming citation (WGSBN Bull. 6, #11, 31), IAU / Minor Planet Center, via NASA/JPL
Where Romanhirsch is today
Seen from above the solar system on 2026-10-14: Romanhirsch is 2.29 au from the Sun and 2.19 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 20636 |
| Provisional designation | 1999 TC97 |
| Orbit class | Main-belt Asteroid |
| Diameter | 4.26 km (#12,138 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0950 |
| Rotation period | 29.7 hours |
| Absolute magnitude (H) | 14.48 |
| Orbital period | 4.36 years |
| Semi-major axis | 2.67 au |
| Perihelion – aphelion | 2.28 – 3.07 au |
| Eccentricity | 0.148 |
| Inclination | 10.1° |
| Closest distance between its orbit and Earth's (MOID) | 1.29 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 2 October 1999
- (12929) Periboea
- (12935) Zhengzhemin
- (13406) Sekora
- (16087) Rhythmgarg
- (16094) Scottmccord
- (20629) Robert
- (20631) Stefuller
- (20632) Carlyrosser
- (20633) Robertluther
- (20634) Marichardson
- (20635) Robinandrews
- (21801) Ancerl