(31984) Unger Main-belt Asteroid
Discovered on 25 April 2000 by Starkenburg at Heppenheim.
Adam Unger (b. 1919), a basket maker by profession, was heavily involved in the construction of the Starkenburg Observatory. His extremely accurate work earned him the nickname “Master of the millimetre”. His enthusiasm for astronomy remains with him to this day.Naming citation (MPC batch dated 2014-05-14), IAU / Minor Planet Center, via NASA/JPL
Where Unger is today
Seen from above the solar system on 2026-10-14: Unger is 2.15 au from the Sun and 2.97 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 31984 |
| Provisional designation | 2000 HR23 |
| Orbit class | Main-belt Asteroid |
| Absolute magnitude (H) | 15.6 |
| Orbital period | 3.76 years |
| Semi-major axis | 2.42 au |
| Perihelion – aphelion | 2.05 – 2.78 au |
| Eccentricity | 0.151 |
| Inclination | 2.98° |
| Closest distance between its orbit and Earth's (MOID) | 1.06 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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