(221026) Jeancoester Main-belt Asteroid
Discovered on 28 August 2005 by B. Christophe at Saint-Sulpice.
Jean Coester (b. 1939), a colleague of the discoverer for many years, started his career working on the CO2 laser and then moved to optronics, working mainly on infrared detectors.Naming citation (20100527/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Jeancoester is today
Seen from above the solar system on 2026-10-14: Jeancoester is 2.44 au from the Sun and 3.40 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 221026 |
| Provisional designation | 2005 QL30 |
| Orbit class | Main-belt Asteroid |
| Absolute magnitude (H) | 16.77 |
| Orbital period | 3.84 years |
| Semi-major axis | 2.45 au |
| Perihelion – aphelion | 2.13 – 2.78 au |
| Eccentricity | 0.132 |
| Inclination | 5.00° |
| Closest distance between its orbit and Earth's (MOID) | 1.15 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Jean
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- (2267) Agassiz
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- (10215) Lavilledemirmont
- (10440) van Swinden
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All asteroids named after someone called Jean