1009 Sirene
| Discovery | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. (024) |
| Discovery date | 31 October 1923 |
| Designations | |
| MPC designation | 1009 Sirene |
|
Named after
|
Siren (mythology) |
| 1923 PE | |
| Mars-crosser | |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 91.64 yr (33473 days) |
| Aphelion | 3.8203 AU (571.51 Gm) |
| Perihelion | 1.4257 AU (213.28 Gm) |
| 2.6230 AU (392.40 Gm) | |
| Eccentricity | 0.45648 |
| 4.25 yr (1551.6 d) | |
| 278.70° | |
| 0° 13m 55.236s / day | |
| Inclination | 15.775° |
| 229.46° | |
| 186.37° | |
| Earth MOID | 0.436395 AU (65.2838 Gm) |
| Jupiter MOID | 1.56808 AU (234.581 Gm) |
| Jupiter Tisserand parameter | 3.200 |
| Physical characteristics | |
| 5–10 km | |
| 13.9 | |
1009 Sirene is a Mars-crosser asteroid. It was discovered by Karl Wilhelm Reinmuth on October 31, 1923, and observed for 4 months. Its provisional designation was 1923 PE and it was named after the mythological Sirens. It became a lost asteroid until it was recovered in 1982 from exposures on the 48-inch (120 cm) Schmidt at Palomar Observatory.
Sirene's semi-major axis is 2.62 AU, well beyond that of Mars, but its highly eccentric orbit crosses Mars', allowing close approaches of the planet. On 8 June 1949 the asteroid passed 0.049 AU (7,300,000 km; 4,600,000 mi) from Mars. With an absolute magnitude of 13.9, the asteroid is about 5–10 km in diameter.
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