(7857) Lagerros Main-belt Asteroid
Discovered on 22 August 1978 by C.-I. Lagerkvist at Mount Stromlo.
Named in honor of Johan S. V. Lagerros (b. 1968) to celebrate the completion of his Ph.D. thesis titled “Thermal Physics of Asteroids”. In a series of papers, he extended and improved the Standard Thermal Model of minor planets. As a result, his model was used for the official calibration of ISO data. The discoverer has also benefited from his experience with computers on numerous occasions.Naming citation (19980411/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Lagerros is today
Seen from above the solar system on 2026-10-14: Lagerros is 2.72 au from the Sun and 2.03 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 7857 |
| Provisional designation | 1978 QC3 |
| Orbit class | Main-belt Asteroid |
| Diameter | 11.3 km (#4,442 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.187 |
| Rotation period | 3.08 hours |
| Absolute magnitude (H) | 11.83 |
| Orbital period | 4.81 years |
| Semi-major axis | 2.85 au |
| Perihelion – aphelion | 2.38 – 3.31 au |
| Eccentricity | 0.163 |
| Inclination | 12.7° |
| Closest distance between its orbit and Earth's (MOID) | 1.43 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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