34 Circe

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34 Circe
Discovery
Discovered by J. Chacornac
Discovery date April 6, 1855
Designations
Named after Circe
Alternative names 1965 JL
Minor planet category Main belt
Orbital characteristics[1]
Epoch November 4, 2013 (JD 2456600.5)
Aphelion 2.967739 AU
Perihelion 2.406230 AU
Semi-major axis 2.686984 AU
Eccentricity 0.1045
Orbital period 4.40 a (1607.332 d)
Average orbital speed 18.12 km/s
Mean anomaly 39.80474°
Inclination 5.498°
Longitude of ascending node 184.44157°
Argument of perihelion 330.2330°
Physical characteristics
Dimensions 113.02 ± 4.90[2] km
Mass (3.66 ± 0.03) × 1018[2] kg
Mean density 4.83 ± 0.63[2] g/cm3
Equatorial surface gravity ~0.0317 m/s²
Escape velocity ~0.0600 km/s
Rotation period 0.5063 d (12.15 h) [1]
Albedo 0.0541 [1]
Temperature ~172 K
Spectral type C
Absolute magnitude (H) 8.51

    34 Circe (/ˈsɜrs/ SUR-see) is a large, very dark main-belt asteroid. It was discovered by French astronomer J. Chacornac on April 6, 1855, and named after Circe, a goddess in Greek mythology.

    Photometric observations of this asteroid made during 2007 at the Organ Mesa Observatory in Las Cruces, New Mexico gave an asymmetrical bimodal light curve with a period of 12.176 ± 0.002 hours and a brightness variation of 0.17 ± 0.02 in magnitude.[3]

    References

    1. 1.0 1.1 1.2 Yeomans, Donald K., "34 Circe", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-12-21. 
    2. 2.0 2.1 2.2 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73: 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009.  See Table 1.
    3. Pilcher, Frederick (September 2008), "Period Determinations for 26 Proserpina, 34 Circe 74 Galatea, 143 Adria, 272 Antonia, 419 Aurelia, and 557 Violetta", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers 35 (3): 135–138, Bibcode:2008MPBu...35..135P. 
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