1009 Sirene

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 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°
 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[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

    1. 1 2 3 "JPL Small-Body Database Browser: 1009 Sirene (1923 PE)" (2015-06-23 last obs.). Jet Propulsion Laboratory. Retrieved 2 May 2016.
    2. 1 2 "(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. 1 2 "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


    This article is issued from Wikipedia - version of the Tuesday, May 03, 2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.