Infrared photometric and polarimetric observations of Comet Kohoutek 1973f

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Photometry, Infrared Astronomy, Kohoutek Comet, Near Infrared Radiation, Polarimetry, Interplanetary Dust, Light Scattering, Luminous Intensity, Optical Polarization, Thermal Emission

Scientific paper

Comet Kohoutek (1973f) has been observed photometrically and polarimetrically in the near-infrared region. The observed spectra revealed two components, scattered sunlight and thermal emission by dust particles. Color temperatures derived from intensities at 2.2 and 3.5 microns are close to the equilibrium temperature of a gray body with solar heating. Polarizations at 1.0 and 1.65 microns have been found to be about 15 to 20% and perpendicular to the tail direction. Properties of the dust particles in the comet are discussed in relation to these observations.

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