(5519) Lellouch Main-belt Asteroid
Discovered on 23 August 1990 by H. E. Holt at Palomar.
Named in honor of Emmanuel Lellouch (b. 1963), planetary scientist at Observatoire de Paris. Lellouch works mainly on planetary and satellite atmospheres using infrared and millimeter spectroscopy. He made important contributions to the first observations of Io's global atmosphere, wind measurements in Venus and Mars, and detection of water in outer planets. He also studies planetary surfaces and comets, and has been or is coinvestigator or associate on many spacecraft experiments (Phobos, Galileo, ISO, Cassini, Mars Express, Rosetta, FIRST). Name suggested and citation prepared by M. A. Barucci and M. Fulchignoni.Naming citation (19990728/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Lellouch is today
Seen from above the solar system on 2026-10-14: Lellouch is 3.07 au from the Sun and 3.55 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 5519 |
| Provisional designation | 1990 QB4 |
| Orbit class | Main-belt Asteroid |
| Diameter | 19.9 km (#2,215 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0590 |
| Absolute magnitude (H) | 12.6 |
| Orbital period | 5.64 years |
| Semi-major axis | 3.17 au |
| Perihelion – aphelion | 3.03 – 3.31 au |
| Eccentricity | 0.0430 |
| Inclination | 6.72° |
| Closest distance between its orbit and Earth's (MOID) | 2.06 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Emmanuel
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