(545784) Kelemenjanos Main-belt Asteroid
Discovered on 18 October 2011 by A. Szing K. Sárneczky at Piszkesteto.
János Kelemen (b. 1951) is a Hungarian astronomer whose main fields of research are the observation of GRB afterglows, comets and minor planets. He mounted the first CCD camera on the Schmidt telescope at the Piszkéstető Station, and he has discovered dozens of flare stars and several numbered minor planets.Naming citation (WGSBN Bull. 1, #12, 11), IAU / Minor Planet Center, via NASA/JPL
Where Kelemenjanos is today
Seen from above the solar system on 2026-10-14: Kelemenjanos is 3.34 au from the Sun and 3.89 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 545784 |
| Provisional designation | 2011 UA57 |
| Orbit class | Main-belt Asteroid |
| Absolute magnitude (H) | 16.5 |
| Orbital period | 5.61 years |
| Semi-major axis | 3.16 au |
| Perihelion – aphelion | 2.87 – 3.44 au |
| Eccentricity | 0.0903 |
| Inclination | 9.84° |
| Closest distance between its orbit and Earth's (MOID) | 1.90 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.