(19981) Bialystock Main-belt Asteroid
Discovered on 29 December 1989 by E. W. Elst at Haute Provence.
Settled in 1437, the Polish city of Bialystock had many occupiers until Jan Klemens Branicki (1689-1771), a commander in chief, became heir to the Bialystock area, where he built the magnificent Branicki castle.Naming citation (20070601/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Bialystock is today
Seen from above the solar system on 2026-10-14: Bialystock is 3.53 au from the Sun and 3.22 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 19981 |
| Provisional designation | 1989 YB6 |
| Orbit class | Main-belt Asteroid |
| Diameter | 12.3 km (#3,978 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0740 |
| Absolute magnitude (H) | 13.26 |
| Orbital period | 5.65 years |
| Semi-major axis | 3.17 au |
| Perihelion – aphelion | 2.48 – 3.86 au |
| Eccentricity | 0.217 |
| Inclination | 14.6° |
| Closest distance between its orbit and Earth's (MOID) | 1.53 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.