(22558) Mladen Main-belt Asteroid
Discovered on 22 April 1998 by P. Kolény L. Kornoš at Modra.
Mladen Kolény, Sr. (1925-1995), father of the first discoverer, taught geography and biology at grammar school. Mladen Kolény, Jr. (1951-2007), brother of the first discoverer, gave lectures on physical geography at Comenius University.Naming citation (WGSBN Bull. 6, #4, 4), IAU / Minor Planet Center, via NASA/JPL
Where Mladen is today
Seen from above the solar system on 2026-10-14: Mladen is 2.12 au from the Sun and 2.28 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 22558 |
| Provisional designation | 1998 HH3 |
| Orbit class | Main-belt Asteroid |
| Diameter | 1.66 km (#17,294 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.213 |
| Rotation period | 3.45 hours |
| Absolute magnitude (H) | 16.0 |
| Orbital period | 3.27 years |
| Semi-major axis | 2.20 au |
| Perihelion – aphelion | 2.09 – 2.31 au |
| Eccentricity | 0.0498 |
| Inclination | 0.772° |
| Closest distance between its orbit and Earth's (MOID) | 1.10 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.