(25142) Hopf Main-belt Asteroid
Discovered on 26 September 1998 by P. G. Comba at Prescott.
Heinz Hopf (1894-1971), of German origin, was a professor of mathematics at the Swiss Institute of Technology in Zurich. His main contributions were in algebraic topology and global differential geometry.Naming citation (20010804/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Hopf is today
Seen from above the solar system on 2026-10-14: Hopf is 2.85 au from the Sun and 2.33 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 25142 |
| Provisional designation | 1998 SA28 |
| Orbit class | Main-belt Asteroid |
| Diameter | 4.89 km (#10,833 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.294 |
| Absolute magnitude (H) | 13.77 |
| Orbital period | 4.57 years |
| Semi-major axis | 2.75 au |
| Perihelion – aphelion | 2.58 – 2.93 au |
| Eccentricity | 0.0641 |
| Inclination | 4.34° |
| Closest distance between its orbit and Earth's (MOID) | 1.56 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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