Lightcurves and phase relations of the asteroids 82 Alkmene and 444 Gyptis

Details Lightcurves and phase relations of the asteroids 82 Alkmene and 444 Gyptis Lightcurves and phase relations of the asteroids 82 Alkmene and 444 Gyptis

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984icar...57..251h&link_type=abstract

Icarus (ISSN 0019-1035), vol. 57, Feb. 1984, p. 251-258.

Astronomy and Astrophysics

Astronomy

36

Asteroids, Astronomical Spectroscopy, Electrophotometers, Light Curve, Radiant Flux Density, Orbital Elements, Asteroids, Lightcurves, Phases, 82 Alkmene, 444 Gytis, Observations, Astronomy, Photoelectric Properties, Rotation, Periods, Amplitude, Comparisons, Brightness, Analysis, Parameters

Scientific paper

The asteroids 82 Alkmene and 444 Gyptis were observed photoelectrically at Table Mountain Observatory and at Torino Observatory during their 1979 opposition in order to determine their rotation periods and phase relations. The observations of 82 Alkmene yielded a rotation period of 12.999 h + or 0.002 h and an amplitude of variation of 0.55. The measured and corrected absolute magnitudes, when plotted against phase angle, is the best fit Lumme and Bowell (1981) theoretical phase function. The rotation period and amplitude of variation for 444 Gyptis are 6.214 h and 0.15, respectively. The phase relation of this asteroid is poorly fit by the Lumme and Bowell theory when only the multiple scattering parameter and the zero phase angle are treated as variables. A good fit can be obtained by adjusting some of the other parameters of their theory, but the physical interpretation is ambiguous.

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