Abstract
The asteroid 133 Cyrene was observed photometrically on 17 nights during oppositions in 1979 and 1980. The synodic period of rotation was found to be 12. h708 ± 0. h001 with an amplitude of ∼0. m30 during both oppositions. At large phase angles, the phase relation is quite ordinary ( β v ≈ 0.025 mag/degree); however, the low phase angle observations reveal a dramatic opposition brightening, ∼0.2 mag/degree near zero phase angle. The absolute magnitude, V(1,0), extrapolated with the above linear phase coefficient, is 8.40. The following color indicates were also measured: B- V = 0.90, U-B = 0.51.
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