1009 Sirene
| Discovery[1] | |
|---|---|
| Discovered by |
Karl Wilhelm Reinmuth Heidelberg (024) |
| Discovery date | October 31, 1923 |
| Designations | |
| MPC designation | 1923 PE |
| Mars-crossing[1] | |
| Orbital characteristics[1] | |
| Epoch 2014-May-23 | |
| Aphelion | 3.8201 AU (Q) |
| Perihelion | 1.4238 AU (q) |
| 2.622 AU (a) | |
| Eccentricity | 0.45696 |
| 4.25 yr | |
| 92.974° (M) | |
| Inclination | 15.7816° |
| 229.47° | |
| 186.39° | |
| Physical characteristics | |
| Dimensions | 5–10 km[2] |
| 13.8[1] | |
|
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1009 Sirene is a Mars-crosser asteroid. It was discovered by Karl Wilhelm Reinmuth on October 31, 1923, and observed for 4 months.[3] Its provisional designation was 1923 PE[1] 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.[4]
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.[1] With an absolute magnitude of 13.8,[1] the asteroid is about 5–10 km in diameter.[2]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 "JPL Close-Approach Data: 1009 Sirene (1923 PE)" (2014-06-01 last obs). Retrieved 2014-06-23.
- ↑ 2.0 2.1 "Absolute Magnitude (H)". NASA/JPL. Retrieved 2014-06-09.
- ↑ "(1009) Sirene = A923PE". IAU Minor Planet Center. Retrieved 2014-06-23.
- ↑ Gibson, J.; Kristensen, L. K. (22 July 1982), Marsden, B. G., ed., "(1009) Sirene", IAU Circular (3714): 1, Bibcode:1982IAUC.3714....1G
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