(9133) d'Arrest Main-belt Asteroid
Discovered on 25 September 1960 by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T. at Palomar.
Named in memory of Heinrich Louis d'Arrest (1822-1875), German astronomer. As an assistant astronomer at the Berlin Observatory, he, together with J. G. Galle, discovered the planet Neptune in 1846. From 1852 d'Arrest served as an astronomer at the Leipzig Observatory and was appointed professor of astronomy. In 1857 he went to Denmark as director of the Copenhagen Observatory, where he discovered (76) Freia. He detected several comets, among them a famous short-period comet, and he was a prolific observer of minor planets and nebulae.Naming citation (19990402/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where d'Arrest is today
Seen from above the solar system on 2026-10-14: d'Arrest is 3.07 au from the Sun and 4.05 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 9133 |
| Provisional designation | 3107 P-L |
| Orbit class | Main-belt Asteroid |
| Diameter | 4.37 km (#11,909 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.212 |
| Absolute magnitude (H) | 14.52 |
| Orbital period | 4.25 years |
| Semi-major axis | 2.63 au |
| Perihelion – aphelion | 2.17 – 3.08 au |
| Eccentricity | 0.173 |
| Inclination | 12.8° |
| Closest distance between its orbit and Earth's (MOID) | 1.18 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Heinrich
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- (16761) Hertz
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All asteroids named after someone called Heinrich