133 Cyrene

Short description: Main-belt asteroid

133 Cyrene

Orbital diagram

Discovery
Discovered by| James Craig Watson
Discovery date| 16 August 1873
Designations

MPC designation

| (133) Cyrene
Pronunciation| /saɪˈriːniː/[1]
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/[2]
Orbital characteristics[3]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc| 142.65 yr (52104 d)
|{{{apsis}}}|helion}}| 3.48274 astronomical unit|AU (521.010 Gm)
|{{{apsis}}}|helion}}| 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°

|{{{apsis}}}|helion}}

| 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]
Physics| ~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 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 (3rd ed.), Oxford University Press, September 2005, http://oed.com/search?searchType=dictionary&q=Cyrenean (Subscription or UK public library membership required.)
3. ↑ 3.0 3.1 3.2 3.3 Yeomans, Donald K., "133 Cyrene", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=133, retrieved 12 May 2016.
4. ↑ 4.0 4.1 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.
5. ↑ 5.0 5.1 Richmond, Michael (1 March 2001), "Asteroid Lightcurve Data File", Astronomy and Astrophysics Supplement Series, http://spiff.rit.edu/richmond/parallax/phot/LCSUMPUB.TXT, retrieved 2013-03-29.
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.
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, https://books.google.com/books?id=VoJ5nUyIzCsC&pg=PA27.
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, doi:10.1086/106097, Bibcode: 1948AJ.....53..199M, http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1948AJ.....53..199M&link_type=ARTICLE&db_key=AST&high=.
9. ↑ DeMeo, Francesca E. et al. (July 2009), "An extension of the Bus asteroid taxonomy into the near-infrared", Icarus 202 (1): pp. 160–180, doi:10.1016/j.icarus.2009.02.005, Bibcode: 2009Icar..202..160D, archived from the original on 2014-03-17, https://web.archive.org/web/20140317200310/https://www.tara.tcd.ie/bitstream/2262/43276/1/PEER_stage2_10.1016/j.icarus.2009.02.005.pdf, retrieved 2013-04-08. 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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