(19364) Semafor Main-belt Asteroid
Discovered on 21 September 1997 by L. Sarounova at Ondrejov.
Theatre Semafor was a special phenomenon of Prague cultural life in the 1960s, with leading personalities Jiří Suchý (b. 1931) and Jiří Šlitr (1924-1969). Many of their songs became popular and they can be still heard by campfires. The name was suggested by L. Vašta.Naming citation (20020427/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Semafor is today
Seen from above the solar system on 2026-10-14: Semafor is 2.40 au from the Sun and 3.39 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 19364 |
| Provisional designation | 1997 SM1 |
| Orbit class | Main-belt Asteroid |
| Diameter | 7.06 km (#7,573 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.204 |
| Absolute magnitude (H) | 12.82 |
| Orbital period | 4.39 years |
| Semi-major axis | 2.68 au |
| Perihelion – aphelion | 2.40 – 2.96 au |
| Eccentricity | 0.104 |
| Inclination | 13.4° |
| Closest distance between its orbit and Earth's (MOID) | 1.40 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.