(51570) Phendricksen Main-belt Asteroid
Discovered on 17 April 2001 by R. Dyvig at Badlands.
Peter B. Hendricksen (b. 1951) is an electrical engineer, mathematician, accomplished classical guitarist and past president of the Black Hills Astronomical Society. Following a devastating fire during the construction phase of Badlands Observatory, he put forth a tremendous volunteer effort in the salvage and reconstruction.Naming citation (20090806/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Phendricksen is today
Seen from above the solar system on 2026-10-14: Phendricksen is 3.05 au from the Sun and 3.58 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 51570 |
| Provisional designation | 2001 HE4 |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.17 km (#14,779 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.160 |
| Absolute magnitude (H) | 14.64 |
| Orbital period | 4.51 years |
| Semi-major axis | 2.73 au |
| Perihelion – aphelion | 2.23 – 3.23 au |
| Eccentricity | 0.183 |
| Inclination | 12.4° |
| Closest distance between its orbit and Earth's (MOID) | 1.25 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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