(133807) Johnphelps Main-belt Asteroid
Discovered on 24 November 2003 by B. L. Stevens at Desert Moon.
John D. Phelps Jr. (1945–2025) was an American amateur astronomer who helped found IOTA and was its first vice-president and later treasurer. He organized many graze expeditions to map the lunar limb. John visited dark sites to make visual observations of the sky. He was on the staff of the Field Museum in Chicago, IL.Naming citation (WGSBN Bull. 6, #10, 10), IAU / Minor Planet Center, via NASA/JPL
Where Johnphelps is today
Seen from above the solar system on 2026-10-14: Johnphelps is 2.82 au from the Sun and 3.56 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 133807 |
| Provisional designation | 2003 WQ152 |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.37 km (#14,307 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0620 |
| Absolute magnitude (H) | 16.16 |
| Orbital period | 4.04 years |
| Semi-major axis | 2.53 au |
| Perihelion – aphelion | 2.12 – 2.94 au |
| Eccentricity | 0.162 |
| Inclination | 10.7° |
| Closest distance between its orbit and Earth's (MOID) | 1.15 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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