133 Cyrene
| Discovery | |
|---|---|
| Discovered by | James Craig Watson |
| Discovery date | August 16, 1873 |
| Designations | |
Named after | Cyrene (mythology) |
| A910 NB; 1936 HO; 1948 QC; 1959 UR | |
| Main belt | |
| Orbital characteristics[1] | |
| Epoch July 14, 2004 (JD 2453200.5) | |
| Aphelion | 522.169 Gm (3.490 AU) |
| Perihelion | 392.840 Gm (2.626 AU) |
| 457.505 Gm (3.058 AU) | |
| Eccentricity | 0.141 |
| 1953.456 d (5.35 a) | |
Average orbital speed | 17.03 km/s |
| 224.793° | |
| Inclination | 7.233° |
| 319.246° | |
| 291.128° | |
| Physical characteristics | |
| Dimensions | 66.6 km |
| Mass | 3.1 × 1017 kg |
Mean density | 2.0? g/cm³ |
| 0.0186 m/s² | |
| 0.0352 km/s | |
| 12.707[2] h (0.5295 d) | |
| Albedo | 0.2563[3] |
| Temperature | ~133 K |
Spectral type | S[3] |
| 7.990[4] | |
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.[5] 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.[6]
In the Tholen classification system, it is categorized as a stony SR-type asteroid.[7] 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.[2]
References
- ^ Yeomans, Donald K., "133 Cyrene", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 2013-03-25.
- ^ 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 (March 1, 2001), "Asteroid Lightcurve Data File", Astronomy and Astrophysics Supplement Series, retrieved 2013-03-29.
- ^ 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, 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, 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, retrieved 2013-04-08. See appendix A.
External links
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