133 Cyrene

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133 Cyrene
133 Cyrene.png
A 3D lightcurve model of 133 Cyrene.
Discovery
Discovered by James Craig Watson
Discovery date16 August 1873
Designations
(133) Cyrene
Pronunciation /saɪˈriːniː/ [1]
Named after
 Cyrene (nymph)
A873 QA; 1910 NB;
1936 HO; 1948 QC;
1959 UR
Main belt
Adjectives Cyrenean /saɪrɪˈniːən/ , Cyrenian /saɪˈriːniən/ [2]
Orbital characteristics [3]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 142.65 yr (52104 d)
Aphelion 3.48274  AU (521.010  Gm)
Perihelion 2.64706 AU (395.995 Gm)
3.06490 AU (458.503 Gm)
Eccentricity 0.13633
5.37 yr (1959.9 d)
Average orbital speed
17.03 km/s
316.166°
0° 11m 1.273s / day
Inclination 7.21561°
319.066°
289.646°
Earth  MOID 1.64415 AU (245.961 Gm)
Jupiter  MOID 1.65199 AU (247.134 Gm)
TJupiter 3.206
Physical characteristics
Dimensions 66.57±6.0  km
Mass 3.1 × 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]

    133 Cyrene is a fairly large and very bright main-belt asteroid that was discovered by J. C. Watson on 16 August 1873 in Ann Arbor, Michigan, 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]

    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 (Online ed.). Oxford University Press.(Subscription or participating institution membership required.)
    3. 1 2 3 4 Yeomans, Donald K., "133 Cyrene", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory , retrieved 12 May 2016.
    4. 1 2 Buchheim, Robert K. (June 2006), "Photometry of asteroids 133 Cyrene, 454 Mathesis, 477 Italia, and 2264 Sabrina", Astronomy and Astrophysics Supplement Series, vol. 33, no. 2, pp. 29–30, Bibcode:2006MPBu...33...29B.
    5. 1 2 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, no. 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, vol. 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, vol. 202, no. 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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