(18016) Grondahl Main-belt Asteroid
Discovered on 13 May 1999 by LINEAR at Socorro.
Brian Jacob Grondahl (b. 1987) was awarded first place in the 2003 Intel International Science and Engineering Fair for his microbiology project. He attends the Maddock High School, Maddock, North Dakota, U.S.A.Naming citation (20040614/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Grondahl is today
Seen from above the solar system on 2026-10-14: Grondahl is 2.53 au from the Sun and 1.70 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 18016 |
| Provisional designation | 1999 JU122 |
| Orbit class | Main-belt Asteroid |
| Diameter | 7.00 km (#7,650 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0770 |
| Absolute magnitude (H) | 14.22 |
| Orbital period | 3.69 years |
| Semi-major axis | 2.39 au |
| Perihelion – aphelion | 2.22 – 2.56 au |
| Eccentricity | 0.0710 |
| Inclination | 6.75° |
| Closest distance between its orbit and Earth's (MOID) | 1.21 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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