1009 Sirene

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1009 Sirene
Discovery [1][2]
Discovered by K. Reinmuth
Discovery site Heidelberg Obs. (024)
Discovery date 31 October 1923
Designations
MPC designation 1009 Sirene
Named after
Siren (mythology)[3]
1923 PE
Mars-crosser
Orbital characteristics[1]
Epoch 27 June 2015 (JD 2457200.5)
Uncertainty parameter 0
Observation arc 91.64 yr (33,473 days)
Aphelion 3.8199 AU
Perihelion 1.4248 AU
2.6223 AU
Eccentricity 0.4566
4.25 yr (1551.1 days)
185.84°
Inclination 15.778°
229.46°
186.38°
Earth MOID 0.4376 AU
Physical characteristics
5–10 km[4]
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.[2] 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.[5]

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,[1] the asteroid is about 5–10 km in diameter.[4]

References[edit]

  1. ^ a b c "JPL Small-Body Database Browser: 1009 Sirene (1923 PE)" (2015-06-23 last obs.). Jet Propulsion Laboratory. Retrieved October 2015. 
  2. ^ a b "(1009) Sirene = A923PE". IAU Minor Planet Center. Retrieved 2014-06-23. 
  3. ^ Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1009) Sirene. Springer Berlin Heidelberg. p. 87. ISBN 978-3-540-29925-7. Retrieved October 2015. 
  4. ^ a b "Absolute Magnitude (H)". NASA/JPL. Retrieved 2014-06-09. 
  5. ^ Gibson, J.; Kristensen, L. K. (22 July 1982), Marsden, B. G., ed., "(1009) Sirene", IAU Circular (3714): 1, Bibcode:1982IAUC.3714....1G 

External links[edit]