(21985) Sejna Main-belt Asteroid
Discovered on 2 December 1999 by L. Sarounova at Ondrejov.
Karel Šejna (1896–1982) was the conductor of the Czech Philharmonic Orchestra during 1938–1972 and cocreator of the era of Talich and Ančerl. He was a significant interpreter of Mahler, Wagner and Bruckner, and his recordings of the compositions of Smetana, Dvořák, Fibich and Suk are superb.Naming citation (WGSBN Bull. 3, #13, 9), IAU / Minor Planet Center, via NASA/JPL
Where Sejna is today
Seen from above the solar system on 2026-10-14: Sejna is 3.39 au from the Sun and 2.44 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21985 |
| Provisional designation | 1999 XG15 |
| Orbit class | Main-belt Asteroid |
| Absolute magnitude (H) | 14.45 |
| Orbital period | 5.47 years |
| Semi-major axis | 3.11 au |
| Perihelion – aphelion | 2.74 – 3.47 au |
| Eccentricity | 0.118 |
| Inclination | 0.731° |
| Closest distance between its orbit and Earth's (MOID) | 1.74 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.