LUNAR AND PLANETARY RESEARCH.
ARIZONA UNIV TUCSON LUNAR AND PLANETARY LAB
Pagination or Media Count:
Polarization of Venus and Mars at 7 wavelengths was observed. Measurements of Venus from 1959 to 1965 show fairly good repetition when observed with infrared, red, and green filters. With the ultraviolet filters, however, appreciable differences are found from year to year. The differences are presumably caused by variations in the optical thickness of the molecular atmosphere above the cloud layers. Observations were made with the 21-in. reflectors of the Steward Observatory in Tucson and the Lunar and Planetary Laboratory in the Santa Catalina Mountains north of Tucson. For both telescoped and instrumental polarization was determined by observations on nonpolarized stars. A few strongly polarized stars were also observed. A good set of measurements was obtained on the polarization of Mercury. Polarization of the whole moon was observed by using the photometers with a one-inch lens instead of the usual telescope.