(12257) Lassine Main-belt Asteroid
Discovered on 3 April 1989 by E. W. Elst at La Silla.
George Lassine (1953-2003) was a member of the Belgian astronomical club Astronomie Centre Ardenne-Neufchâteau. His observations of sunspots have been sent regularly to the Sunspot Index Data Center. A brilliant observer, he was esteemed for his great heart and sense of humor.Naming citation (20031110/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Lassine is today
Seen from above the solar system on 2026-10-14: Lassine is 2.44 au from the Sun and 2.25 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 12257 |
| Provisional designation | 1989 GL4 |
| Orbit class | Main-belt Asteroid |
| Diameter | 4.07 km (#12,565 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.244 |
| Absolute magnitude (H) | 14.13 |
| Orbital period | 4.05 years |
| Semi-major axis | 2.54 au |
| Perihelion – aphelion | 2.22 – 2.86 au |
| Eccentricity | 0.127 |
| Inclination | 13.5° |
| Closest distance between its orbit and Earth's (MOID) | 1.22 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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