The lightcurve and phase relation of the asteroid 133 Cyrene

Details The lightcurve and phase relation of the asteroid 133 Cyrene The lightcurve and phase relation of the asteroid 133 Cyrene

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984icar...58..377h&link_type=abstract

Icarus (ISSN 0019-1035), vol. 58, June 1984, p. 377-382.

Astronomy and Astrophysics

Astronomy

9

Asteroids, Astronomical Photometry, Light Curve, Phase Shift, Colorimetry, Magnitude, Planetary Rotation, Asteroids, Lightcurves, Phases, Cyrene, Photometry, Observations, Astronomy, Rotation, Period, Amplitude, Brightness, Colors, Data, Comparisons, Optical Properties

Scientific paper

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 12.708 + or - 0.001 h with an amplitude of 0.30 m during both oppositions. At large phase angles, the phase relation is quite ordinary (0.025 mag/degree); however, the low phase angle observations reveal a dramatic opposition brightening, about 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 indices were also measured: B-V = 0.90, U-B = 0.51.

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