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Discovery
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| Discovered by | James Craig Watson |
| Discovery date | August 16, 1873 |
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Designations
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| Named after | Cyrene (mythology) |
| Alternate name(s) | A910 NB; 1936 HO; 1948 QC; 1959 UR |
| Minor planet category |
Main belt |
| Epoch July 14, 2004 (JD 2453200.5) | |
| Aphelion | 522.169 Gm (3.490 AU) |
| Perihelion | 392.840 Gm (2.626 AU) |
| Semi-major axis | 457.505 Gm (3.058 AU) |
| Eccentricity | 0.141 |
| Orbital period | 1953.456 d (5.35 a) |
| Average orbital speed | 17.03 km/s |
| Mean anomaly | 224.793° |
| Inclination | 7.233° |
| Longitude of ascending node | 319.246° |
| Argument of perihelion | 291.128° |
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Physical characteristics
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| Dimensions | 66.6 km |
| Mass | 3.1×1017 kg |
| Mean density | 2.0? g/cm³ |
| Equatorial surface gravity | 0.0186 m/s² |
| Escape velocity | 0.0352 km/s |
| Rotation period | 0.5295 d (12.708 h) |
| Albedo | 0.256 2 |
| Temperature | ~133 K |
| Spectral type | S 1 |
| Absolute magnitude (H) | 7.98 |
133 Cyrene is a fairly large and very bright main-belt asteroid. It is an S-type.
It 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.
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