133 Cyrene
| Discovery A | |
|---|---|
| Discoverer | James Craig Watson |
| Discovery Date | August 16, 1873 |
| Alternate Designations | A910 NB; 1936 HO; 1948 QC; 1959 UR B |
| Category | Main belt |
| Orbital Elements C Epoch July 14, 2004 (JD 2453200.5) | |
| Eccentricity (e) | 0.141 |
| Semi-Major Axis (a) | 457.505 Gm (3.058 AU) |
| Perihelion (q) | 392.840 Gm (2.626 AU) |
| Aphelion (Q) | 522.169 Gm (3.490 AU) |
| Orbital Period (P) | 1953.456 d (5.35 a) |
| Mean Orbital Speed | 17.03 km/s |
| Inclination (i) | 7.233° |
| Longitude of the Ascending Node (Ω) | 319.246° |
| Argument of Perihelion (ω) | 291.128° |
| Mean Anomaly (M) | 224.793° |
| Physical Characteristics | |
| Dimensions | 66.6 km |
| Mass | 3.1×1017 kg |
| Density | 2.0? g/cm³ |
| Surface Gravity | 0.0186 m/s² |
| Escape Velocity | 0.0352 km/s |
| Rotation Period | 0.5295 d (12.708 h) |
| Spectral Class | S-type asteroid 1 |
| Absolute Magnitude | 7.98 |
| Albedo | 0.256 2 |
| Mean Surface Temperature | ~133 K |
133 Cyrene is a fairly large and very bright main belt asteroid. It probably has a composition of silicate rock and metallic nickel-iron.
It was discovered by J. C. Watson on August 16, 1873 and named after Cyrene, a nymph, daughter of the river Peneus and beloved of Apollo in Greek mythology.
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