133 Cyrene

133 Cyrene
Discovery
Discovered by James Craig Watson
Discovery date August 16, 1873
Designations
Named after
 Cyrene (mythology)
A910 NB; 1936 HO;
1948 QC; 1959 UR
Main belt
Orbital characteristics[1]
Epoch July 14, 2004 (JD 2453200.5)
Aphelion 522.169 Gm (3.490 AU)
Perihelion 392.840 Gm (2.626 AU)
457.505 Gm (3.058 AU)
Eccentricity 0.141
1953.456 d (5.35 a)
17.03 km/s
224.793°
Inclination 7.233°
319.246°
291.128°
Physical characteristics
Dimensions 66.6 km
Mass 3.1 × 1017 kg
Mean density
 2.0? g/cm³
0.0186 m/s²
0.0352 km/s
12.707[2] h (0.5295 d)
Albedo 0.2563[3]
Temperature ~133 K
Spectral type
 S[3]
7.990[4]

    133 Cyrene is a fairly large and very bright main-belt asteroid that was discovered by J. C. Watson on August 16, 1873, and named after Cyrene, a nymph, daughter of king Hypseus and beloved of Apollo in Greek mythology.[5] It is classified as an S-type asteroid based upon its spectrum. It is listed as a member of the Hecuba group of asteroids that orbit near the 2:1 mean-motion resonance with Jupiter.[6]

    In the Tholen classification system, it is categorized as a stony SR-type asteroid.[7] Photometric observations of this asteroid at the Altimira Observatory in 1985 gave a light curve with a period of 12.707 ± 0.015 hours and a brightness variation of 0.22 in magnitude. This result matches previous measurements reported in 1984 and 2005.[2]

    References

    1. ↑ Yeomans, Donald K., "133 Cyrene", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-03-25.
    2. ↑ 2.0 2.1 Buchheim, Robert K. (June 2006), "Photometry of asteroids 133 Cyrene, 454 Mathesis, 477 Italia, and 2264 Sabrina", Astronomy and Astrophysics Supplement Series 33 (2): 29–30, Bibcode:2006MPBu...33...29B.
    3. ↑ 3.0 3.1 Richmond, Michael (March 1, 2001), "Asteroid Lightcurve Data File", Astronomy and Astrophysics Supplement Series, retrieved 2013-03-29.
    4. ↑ Pravec, P. et al. (May 2012), "Absolute Magnitudes of Asteroids and a Revision of Asteroid Albedo Estimates from WISE Thermal Observations", Asteroids, Comets, Meteors 2012, Proceedings of the conference held May 16–20, 2012 in Niigata, Japan (1667), Bibcode:2012LPICo1667.6089P.
    5. ↑ Schmadel, Lutz D.; International Astronomical Union (2003), Dictionary of minor planet names, Berlin; New York: Springer-Verlag, p. 27, ISBN 978-3-540-00238-3, retrieved 13 May 2012.
    6. ↑ McDonald, Sophia Levy (June 1948), "General perturbations and mean elements, with representations of 35 minor planets of the Hecuba group", Astronomical Journal 53: 199, Bibcode:1948AJ.....53..199M, doi:10.1086/106097.
    7. ↑ DeMeo, Francesca E. et al. (July 2009), "An extension of the Bus asteroid taxonomy into the near-infrared", Icarus 202 (1): 160–180, Bibcode:2009Icar..202..160D, doi:10.1016/j.icarus.2009.02.005, retrieved 2013-04-08. See appendix A.