(9381) Lyons
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Asteroid (9381) Lyon |
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| Properties of the orbit ( animation ) | |
| Orbit type | Main outer belt asteroid |
| Major semi-axis | 2.9986 AU |
| eccentricity | 0.0605 |
| Perihelion - aphelion | 2.8173 AU - 3.1799 AU |
| Inclination of the orbit plane | 1.1344 ° |
| Length of the ascending node | 355.9535 ° |
| Argument of the periapsis | 100.0934 ° |
| Time of passage of the perihelion | January 12, 2021 |
| Sidereal period | 5.19 a |
| Mean orbital velocity | 17.18 km / s |
| Physical Properties | |
| Medium diameter | 7.156 (± 0.085) km |
| Albedo | 0.198 (± 0.020) |
| Absolute brightness | 12.8 mag |
| history | |
| Explorer | Henri Debehogne , Eric Walter Elst |
| Date of discovery | September 15, 1993 |
| Another name | 1993 RT 19 , 1975 EK 6 , 1980 DO 2 , 1985 BH 1 , 1991 GP 5 , 1998 QW 39 |
| Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items. | |
(9381) Lyon is an asteroid located in the outer main belt , which was discovered on September 15, 1993 by the Belgian astronomers Henri Debehogne and Eric Walter Elst at the La Silla Observatory of the European Southern Observatory in Chile ( IAU code 809). There had been several sightings of the asteroid before: on March 15, 1975 under the provisional designation 1975 EK 6 and on February 20, 1980 (1980 DO 2 ) at the Crimean Observatory in Nautschnyj , on January 18, 1985 (1985 BH 1 ) at the remote station of the Steward Observatory located on Kitt Peak and on April 8, 1991 (1991 GP 5 ) also at the La Silla Observatory.
The mean diameter of the asteroid was calculated to be 7.156 (± 0.085) km .
According to the SMASS classification ( Small Main-Belt Asteroid Spectroscopic Survey ), a spectroscopic study by Gianluca Masi , Sergio Foglia and Richard P. Binzel divided all examined asteroids into C, S and V types (9381) Lyon assigned to the S asteroids .
The mean distance from the sun ( major semi-axis ), eccentricity and inclination of the orbit plane of the asteroid roughly correspond to the Koronis family, an asteroid family named after (158) Koronis .
(9381) Lyon was named after the French city of Lyon on April 2, 1999 . The Venus crater Lyon, on the other hand, was named in 1994 after the American educator and women's rights activist Mary Lyon .
Web links
- (9381) Lyon in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
- (9381) Lyon in the Small-Body Database of the Jet Propulsion Laboratory of NASA at the California Institute of Technology (Caltech) in Pasadena , California (English)
- Discovery Circumstances of (9381) Lyon according to the Minor Planet Center of the International Astronomical Union at the Harvard-Smithsonian Center for Astrophysics in Cambridge , Massachusetts (English)
Individual evidence
- ↑ (9381) Lyon at the IAU Minor Planet Center (English)
- ^ Gianluca Masi, Sergio Foglia, Richard P. Binzel: Search for Unusual Spectroscopic Candidates Among 40313 minor planets from the 3rd Release of the Sloan Digital Sky Survey Moving Object Catalog . (English)
- ↑ subdivision of asteroids to S-types, C-types and V-types (English)
- ↑ The Venus Crater Lyon in the Gazetteer of Planetary Nomenclature of the IAU (WGPSN) / USGS (English)