(20991) Jankollar Main-belt Asteroid
Discovered on 28 November 1984 by M. Antal at Piszkesteto.
Ján Kollár (1793–1852), a great Slovak poet and a herald of Slavonic mutuality, was author of the extensive poetic work Slávy dcera (Daughter of sláva, 1824–1832) and the folk verbal arts collection Národnie zpievanky (National songs). His work belongs equally to the literary heritage of both the Czech and Slovak republics.Naming citation (WGSBN Bull. 3, #14, 5), IAU / Minor Planet Center, via NASA/JPL
Where Jankollar is today
Seen from above the solar system on 2026-10-14: Jankollar is 2.86 au from the Sun and 3.68 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 20991 |
| Provisional designation | 1984 WX1 |
| Orbit class | Main-belt Asteroid |
| Diameter | 7.07 km (#7,559 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.128 |
| Absolute magnitude (H) | 13.9 |
| Orbital period | 5.12 years |
| Semi-major axis | 2.97 au |
| Perihelion – aphelion | 2.76 – 3.18 au |
| Eccentricity | 0.0706 |
| Inclination | 11.3° |
| Closest distance between its orbit and Earth's (MOID) | 1.78 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Jan
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- (7221) Sallaba
- (7701) Zrzavy
- (7849) Janjosefric
- (8149) Ruff
- (9239) van Riebeeck
- (9259) Janvanparadijs
All asteroids named after someone called Jan