(11830) Jessenius Main-belt Asteroid
Discovered on 2 May 1984 by A. Mrkos at Klet.
Ján Jesenský (Jessenius, 1566-1621) was a physician, head of Prague university beginning in 1618 and Tycho Brahe's friend in Prague. He was executed at the beginning of the Thirty Years' War. The name was suggested by J. Ticha and M. Tichy.Naming citation (20000523/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Jessenius is today
Seen from above the solar system on 2026-10-14: Jessenius is 2.60 au from the Sun and 1.88 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 11830 |
| Provisional designation | 1984 JE |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.46 km (#14,080 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.489 |
| Rotation period | 46.8 hours |
| Absolute magnitude (H) | 13.89 |
| Orbital period | 3.41 years |
| Semi-major axis | 2.27 au |
| Perihelion – aphelion | 1.87 – 2.66 au |
| Eccentricity | 0.176 |
| Inclination | 8.74° |
| Closest distance between its orbit and Earth's (MOID) | 0.899 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Jan
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All asteroids named after someone called Jan