(20430) Stout Main-belt Asteroid
Discovered on 10 January 1999 by Cooney Jr., W. R., Lazar, S. at Baton Rouge.
A music professor at Louisiana State University who was fascinated by the mysteries of space being revealed in his time and was always researching new ideas, Earl Douglas Stout (1895?--1985) was a great-grandfather of the second discoverer.Naming citation (20020624/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Stout is today
Seen from above the solar system on 2026-10-14: Stout is 2.78 au from the Sun and 3.65 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 20430 |
| Provisional designation | 1999 AC3 |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.39 km (#14,244 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.243 |
| Absolute magnitude (H) | 14.74 |
| Orbital period | 4.30 years |
| Semi-major axis | 2.64 au |
| Perihelion – aphelion | 2.11 – 3.18 au |
| Eccentricity | 0.201 |
| Inclination | 14.8° |
| Closest distance between its orbit and Earth's (MOID) | 1.12 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.