Photoelectric lightcurves and rotation periods of the asteroids 46 Hestia and 115 Thyra |
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Authors: | Franco Scaltriti Vincenzo Zappalà AW Harris |
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Institution: | Osservatorio Astronomico di Torino, 10025 Pino Torinese, Turin, Italy;Jet Propulsion Laboratory, Pasadena, California 91109, USA |
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Abstract: | Results of photoelectric observations of the asteriods 46 Hestia and 115 Thyra, performed in a cooperative program between the Torino and Table Mountain Observatories, are presented. The rotation periods and the maximum amplitudes are: Psyn = 21h.0.4 ± 0h.01, Amplitude = 0.12 mag and Psyn = 7h.241 ± 0.h.001, Amplitude = 0.20 mag, for Hestia and Thyra, respectively. The multiple-scattering factors, Q, inferred from the phase relation data are 0.054 ± 0.003 and 0.058 ± 0.002 for Hestia and Thyra, respectively. The low value obtained for Thyra disagrees with the mean one given by Bowell and Lumme (1979, in Asteroids (T. Gehrels, Ed.), pp. 132–169. University of Arizona Press, Tucson) for S-type asteroids. |
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