343158 Marsyas
343158 Marsyas (prov. designated 2009 HC82) is an asteroid on a retrograde orbit, classified as a large near-Earth object of the Apollo group. It may be an extinct comet or damocloid asteroid. The asteroid was discovered on 29 April 2009, by astronomers with the Catalina Sky Survey at the Catalina Station near Tucson, Arizona, in the United States. Approximately 2 kilometers (1.2 miles) in diameter, it makes many close approaches to Earth, Venus, and Mars at a very high relative velocity. It was named after the satyr Marsyas from Greek mythology.
| Discovery | |
|---|---|
| Discovered by | CSS |
| Discovery site | Catalina Stn. |
| Discovery date | 29 April 2009 |
| Designations | |
MPC designation | (343158) Marsyas |
Named after | Marsyas (Greek mythology) |
Alternative designations | 2009 HC82 |
Minor planet category | NEO · Apollo Retrograde |
| Orbital characteristics | |
| Epoch 17 December 2020 (JD 2459200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 17.17 yr (6,270 d) |
| Aphelion | 4.5656 AU |
| Perihelion | 0.4886 AU |
Semi-major axis | 2.5271 AU |
| Eccentricity | 0.8067 |
Orbital period (sidereal) | 4.02 yr (1,467 d) |
Mean anomaly | 5.8661° |
Mean motion | 0° 14m 43.08s / day |
| Inclination | 154.37° |
Longitude of ascending node | 295.40° |
| 298.88° | |
| Earth MOID | 0.1471 AU (57.2 LD) |
| TJupiter | 1.3160 |
| Physical characteristics | |
Mean diameter | 1.7 km (est. at 0.22) 3.5 km (est. at 0.05) |
| ~20 | |
| 16.27 | |
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