(20718) Silha Outer Main-belt Asteroid
Discovered on 7 December 1999 by LINEAR at Socorro.
Jiří Šilha (b. 1983) is a Slovak astronomer at the Faculty of Mathematics, Physics and Informatics, Comenius University in Bratislava, Slovakia. He works on optical observations of space debris and small Solar System bodies, conducts space-safety surveys with ground-based telescopes, and studies meteoroids, satellites, and orbital debris.Naming citation (WGSBN Bull. 6, #11, 34), IAU / Minor Planet Center, via NASA/JPL
Where Silha is today
Seen from above the solar system on 2026-10-14: Silha is 3.37 au from the Sun and 4.10 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 20718 |
| Provisional designation | 1999 XZ97 |
| Orbit class | Outer Main-belt Asteroid |
| Diameter | 23.0 km (#1,852 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0500 |
| Absolute magnitude (H) | 12.36 |
| Orbital period | 6.40 years |
| Semi-major axis | 3.45 au |
| Perihelion – aphelion | 3.07 – 3.82 au |
| Eccentricity | 0.108 |
| Inclination | 11.8° |
| Closest distance between its orbit and Earth's (MOID) | 2.06 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 7 December 1999
- (13438) Marthanalexander
- (13845) Jillburnett
- (13848) Cioffi
- (13849) Dunn
- (13850) Erman
- (13852) Ford
- (13853) Jenniferfritz
- (14225) Alisahamilton
- (14226) Hamura
- (14230) Mariahines
- (14679) Susanreed
- (16118) Therberens