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133 Cyrene
	Orbital diagram
Discovery
Discovered by	James Craig Watson
Discovery date	16 August 1873
Designations
MPC designation	(133) Cyrene
Pronunciation	/saɪˈriːniː/
Named after	Cyrene (nymph)
Alternative designations	A873 QA; 1910 NB;; 1936 HO; 1948 QC;; 1959 UR
Minor planet category	Main belt
Adjectives	Cyrenean /saɪrɪˈniːən/, Cyrenian /saɪˈriːniən/
Orbital characteristics
	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)
Semi-major axis	3.06490 AU (458.503 Gm)
Eccentricity	0.13633
Orbital period (sidereal)	5.37 yr (1959.9 d)
Average orbital speed	17.03 km/s
Mean anomaly	316.166°
Mean motion	0° 11m 1.273s / day
Inclination	7.21561°
Longitude of ascending node	319.066°
Argument of perihelion	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
Synodic rotation period	12.708 h (0.5295 d); 12.707 h (0.5295 d)
Geometric albedo	0.2563±0.053; 0.2563
Temperature	~133 K
Spectral type	S
Absolute magnitude (H)	7.98, 7.990

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

^ Noah Webster (1884) A Practical Dictionary of the English Language
^ "Cyrenean". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
^ ^a ^b ^c ^d Yeomans, Donald K., "133 Cyrene", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
^ ^a ^b 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.
^ ^a ^b Richmond, Michael (1 March 2001), "Asteroid Lightcurve Data File", Astronomy and Astrophysics Supplement Series, retrieved 29 March 2013.
^ 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.
^ 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.
^ 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.
^ 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.

External links

133 Cyrene at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
133 Cyrene at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

This article about an S-type asteroid native to the asteroid belt is a stub. You can help Wikipedia by expanding it.

[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.)

[JPL-3] Yeomans, Donald K., "133 Cyrene", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.

[Buchheim2006-4] 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.

[Richmond2001-5] Richmond, Michael (1 March 2001), "Asteroid Lightcurve Data File", Astronomy and Astrophysics Supplement Series, retrieved 29 March 2013.

[Pravec2012-6] 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.

[Schmadel-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.

[McDonald1948-8] 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.

[DeMeo2009-9] 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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