(223339) Gregdunn Main-belt Asteroid
Discovered on 26 August 2003 by M. W. Buie at Cerro Tololo.
Gregory F. Dunn (b. 1979) is an American engineering team member of the NASA New Horizons payload development team. He provided critical support to the development of the mission for launch to Pluto and the Kuiper Belt.Naming citation (WGSBN Bull. 5, #4, 28), IAU / Minor Planet Center, via NASA/JPL
Where Gregdunn is today
Seen from above the solar system on 2026-10-14: Gregdunn is 2.69 au from the Sun and 1.79 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 223339 |
| Provisional designation | 2003 QC89 |
| Orbit class | Main-belt Asteroid |
| Absolute magnitude (H) | 15.6 |
| Orbital period | 5.59 years |
| Semi-major axis | 3.15 au |
| Perihelion – aphelion | 2.69 – 3.61 au |
| Eccentricity | 0.147 |
| Inclination | 9.44° |
| Closest distance between its orbit and Earth's (MOID) | 1.72 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Gregory
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- (53435) Leonard
- (85878) Guzik
All asteroids named after someone called Gregory
Also discovered on 26 August 2003
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