10 micron polarimetry of Ceres

Details 10 micron polarimetry of Ceres 10 micron polarimetry of Ceres

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983icar...56..381j&link_type=abstract

Icarus (ISSN 0019-1035), vol. 56, Dec. 1983, p. 381-392. Research supported by the University of Washington, NASA, and NSF.

Astronomy and Astrophysics

Astronomy

16

Ceres Asteroid, Infrared Astronomy, Polar Coordinates, Polarimetry, Thermal Radiation, Thermophysical Properties, Astrometry, Astronomical Coordinates, Inertia, Linear Polarization, Planetary Temperature, Surface Roughness Effects

Scientific paper

Linear polarimetry of Ceres at 10 micron is presented. These data represent the first published polarization measurements of an asteroid in the thermal infrared. It is found that Ceres is polarized at the 0.2-0.6 percent level. This data set is compared with theoretical models of the linear polarization of emitted radiation from a spherical plane. These models are used to derive the pole position and thermal inertia of Ceres. Ceres is best fit with a thermal inertia of 0.0010 + or 0.0003 cal (sq cm K) per square root of second and a pole orientation of beta(p) = 36 deg + or - 5 deg + or -5, lambda(p) = 270 deg + or - 3. It is concluded that 10 micron polarimetry is a potentially powerful technique for remotely sensing the pole orientation and thermal inertia of asteroids.

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