 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° 11 1.273 / 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 × 10 kg |
| Mean density | 2.0? g/cm |
| 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. 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.
In the Tholen classification system, it is categorized as a stony SR-type asteroid. 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.
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.)
- ^ 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, vol. 33, no. 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, 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
- 133 Cyrene at the JPL Small-Body Database
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