(187638) Greenewalt Main-belt Asteroid
Discovered on 11 February 2007 by D. R. Skillman at Front Royal.
Crawford Greenewalt (1902-1993) witnessed Fermi's first atomic chain reaction in 1942, and as technical director of the plutonium plant in Hanford, Washington, headed DuPont's involvement in the Manhattan project. His great-grandson, Asher Greenewalt (b. 2003), is already taking an interest in science.Naming citation (20090806/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Greenewalt is today
Seen from above the solar system on 2026-10-14: Greenewalt is 2.77 au from the Sun and 3.48 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 187638 |
| Provisional designation | 2007 CH26 |
| Orbit class | Main-belt Asteroid |
| Absolute magnitude (H) | 17.06 |
| Orbital period | 3.91 years |
| Semi-major axis | 2.48 au |
| Perihelion – aphelion | 2.20 – 2.77 au |
| Eccentricity | 0.114 |
| Inclination | 7.03° |
| Closest distance between its orbit and Earth's (MOID) | 1.19 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.