(10395) Jirkahorn Main-belt Asteroid
Discovered on 23 September 1997 by Wolf, M., Pravec, P. at Ondrejov.
Named in memory of Jiří Horn (1941-1994), an astronomer at the Ondřejov Observatory. He worked in stellar astrophysics, observational astronomy and data reduction, making important contributions to all of them. He was a member of the team that in the late 1960s made the first calculations of the evolution of close binaries with mass loss. He played an important role in the commissioning phase of the 2-m telescope at Ondřejov. He created the user-friendly software SPEFO for the reduction of stellar spectra that is still in use by many astronomers. Name proposed by the discoverers, following a suggestion by P. Koubský, who also prepared the citation.Naming citation (19990728/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Jirkahorn is today
Seen from above the solar system on 2026-10-14: Jirkahorn is 2.74 au from the Sun and 3.47 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 10395 |
| Provisional designation | 1997 SZ1 |
| Orbit class | Main-belt Asteroid |
| Diameter | 7.65 km (#6,946 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0520 |
| Rotation period | 3.67 hours |
| Absolute magnitude (H) | 14.55 |
| Orbital period | 3.82 years |
| Semi-major axis | 2.44 au |
| Perihelion – aphelion | 2.15 – 2.74 au |
| Eccentricity | 0.120 |
| Inclination | 2.71° |
| Closest distance between its orbit and Earth's (MOID) | 1.17 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.