Back 13 سيرينى (كويكب) ARZ 133 Cyrene AST (133) Cyrene BAR (133) Кірэна Byelorussian (133) Cirene Catalan (133) Кирена CE (133) Cyrene German 133 Κυρήνη Greek 133 Cireno Esperanto (133) Cirene Spanish
 Orbital diagram | |
| Discovery | |
|---|---|
| Discovered by | James Craig Watson |
| Discovery date | 16 August 1873 |
| Designations | |
| (133) Cyrene | |
| Pronunciation | /saɪˈriːniː/[1] |
Named after | Cyrene (nymph) |
| A873 QA; 1910 NB; 1936 HO; 1948 QC; 1959 UR | |
| 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) |
| 3.06490 AU (458.503 Gm) | |
| Eccentricity | 0.13633 |
| 5.37 yr (1959.9 d) | |
Average orbital speed | 17.03 km/s |
| 316.166° | |
| 0° 11m 1.273s / day | |
| Inclination | 7.21561° |
| 319.066° | |
| 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 |
| 12.708 h (0.5295 d)[3] 12.707 h (0.5295 d)[4] | |
| 0.2563±0.053[3] 0.2563[5] | |
| Temperature | ~133 K |
| S[5] | |
| 7.98,[3] 7.990[6] | |
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]
- ^ 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.)
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