133 Cyrene

Cyrene, minor planet designation 133 Cyrene, is a fairly large and very bright main-belt asteroid that was discovered by J. C. Watson on 16 August 1873, and named after Cyrene, a nymph, daughter of king Hypseus and beloved of Apollo in Greek mythology.[7] 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.[8]

133 Cyrene
Discovery
Discovered byJames Craig Watson
Discovery date16 August 1873
Designations
(133) Cyrene
Pronunciation/sˈrn/[1]
Named after
Cyrene (mythology)
A910 NB; 1936 HO;
1948 QC; 1959 UR
Main belt
AdjectivesCyrenean /srɪˈnən/, Cyrenian /sˈrniən/[2]
Orbital characteristics[3]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc142.65 yr (52104 d)
Aphelion3.48274 AU (521.010 Gm)
Perihelion2.64706 AU (395.995 Gm)
3.06490 AU (458.503 Gm)
Eccentricity0.13633
5.37 yr (1959.9 d)
17.03 km/s
316.166°
 11m 1.273s / day
Inclination7.21561°
319.066°
289.646°
Earth MOID1.64415 AU (245.961 Gm)
Jupiter MOID1.65199 AU (247.134 Gm)
TJupiter3.206
Physical characteristics
Dimensions66.57±6.0 km
Mass3.1 × 1017 kg
Mean density
2.0? g/cm³
Equatorial surface gravity
0.0186 m/s²
Equatorial escape velocity
0.0352 km/s
12.708 h (0.5295 d)[3]
12.707 h (0.5295 d)[4]
0.2563±0.053[3]
0.2563[5]
Temperature~133 K
S[5]
7.98,[3] 7.990[6]

    In the Tholen classification system, it is categorized as a stony SR-type asteroid.[9] 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.[4]

    References

    1. Noah Webster (1884) A Practical Dictionary of the English Language
    2. "Cyrenean". Oxford English Dictionary (3rd ed.). Oxford University Press. September 2005. (Subscription or UK public library membership required.)
    3. Yeomans, Donald K., "133 Cyrene", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
    4. Buchheim, Robert K. (June 2006), "Photometry of asteroids 133 Cyrene, 454 Mathesis, 477 Italia, and 2264 Sabrina", Astronomy and Astrophysics Supplement Series, 33 (2), pp. 29–30, Bibcode:2006MPBu...33...29B.
    5. Richmond, Michael (1 March 2001), "Asteroid Lightcurve Data File", Astronomy and Astrophysics Supplement Series, retrieved 29 March 2013.
    6. 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.
    7. 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.
    8. McDonald, Sophia Levy (June 1948), "General perturbations and mean elements, with representations of 35 minor planets of the Hecuba group", Astronomical Journal, 53, p. 199, Bibcode:1948AJ.....53..199M, doi:10.1086/106097.
    9. DeMeo, Francesca E.; et al. (July 2009), "An extension of the Bus asteroid taxonomy into the near-infrared" (PDF), Icarus, 202 (1), pp. 160–180, Bibcode:2009Icar..202..160D, doi:10.1016/j.icarus.2009.02.005, archived from the original (PDF) on 17 March 2014, retrieved 8 April 2013. See appendix A.


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