133 Cyrene

133 Cyrene
Discovery
Discovered by	James Craig Watson
Discovery date	16 August 1873
Designations
MPC designation	(133) Cyrene
Pronunciation	/saɪˈriːniː/[1]
Named after	Cyrene (mythology)
Alternative designations	A910 NB; 1936 HO;; 1948 QC; 1959 UR
Minor planet category	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)
Semi-major axis	3.06490 AU (458.503 Gm)
Eccentricity	0.13633
Orbital period	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
Rotation period	12.708 h (0.5295 d)[3]; 12.707 h (0.5295 d)[4]
Geometric albedo	0.2563±0.053[3]; 0.2563[5]
Temperature	~133 K
Spectral type	S[5]
Absolute magnitude (H)	7.98,[3] 7.990[6]

Cyrene, minor planet designation 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.[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 (3rd ed.). Oxford University Press. September 2005. (Subscription or UK public library membership required.)
Yeomans, Donald K., "133 Cyrene", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
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.
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 (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, retrieved 13 May 2012.
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.
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.

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 diagram · Orbital elements · Physical parameters

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[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.)

[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, 33 (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 (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, retrieved 13 May 2012.

[McDonald1948-8] 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.

[DeMeo2009-9] 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.