(21664) Konradzuse Main-belt Asteroid
Discovered on 4 September 1999 by L. Sarounova at Ondrejov.
German engineer Konrad Zuse (1910-1995) developed and built the first binary digital computer. Working in complete isolation and secrecy, in 1941 he completed the Z3, the first operational program-controlled computer, before fleeing to Switzerland. Zuse computers were the first to be used by astronomers in Czechoslovakia.Naming citation (20010902/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Konradzuse is today
Seen from above the solar system on 2026-10-14: Konradzuse is 2.39 au from the Sun and 3.34 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21664 |
| Provisional designation | 1999 RG1 |
| Orbit class | Main-belt Asteroid |
| Diameter | 4.16 km (#12,371 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.195 |
| Absolute magnitude (H) | 14.58 |
| Orbital period | 4.22 years |
| Semi-major axis | 2.61 au |
| Perihelion – aphelion | 2.06 – 3.16 au |
| Eccentricity | 0.210 |
| Inclination | 9.55° |
| Closest distance between its orbit and Earth's (MOID) | 1.10 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Konrad
All asteroids named after someone called Konrad
Also discovered on 4 September 1999
- (12574) LONEOS
- (12575) Palmaria
- (20497) Marenka
- (20500) Avner
- (20607) Vernazza
- (21684) Alinafiocca
- (23990) Springsteen
- (40410) Prihoda
- (40457) Williamkuhn
- (59970) Morate
- (66479) Healy
- (70207) Davidunlap
More named asteroids discovered by L. Sarounova
- (7670) Kabelac
- (7897) Bohuska
- (8557) Saroun
- (9449) Petrbondy
- (9671) Hemera
- (10215) Lavilledemirmont
- (10626) Zajic
- (10634) Pepibican
- (10919) Pepikzicha
- (11101) Ceskafilharmonie
- (11201) Talich
- (11325) Slavicky
← (21663) Banat · (21665) Frege →