Imaging polarimetry of the comet P/Swift-Tuttle

Details Imaging polarimetry of the comet P/Swift-Tuttle Imaging polarimetry of the comet P/Swift-Tuttle

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.273..431g&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 273, Issue 2, pp. 431-442.

Astronomy and Astrophysics

Astronomy

4

Polarization-Instrumentation, Polarimeters-Techniques, Polarimetric-Comets, Individual, Swift-Tuttle.

Scientific paper

We develop a novel method of imaging polarimetry based on simultaneous recording of two-dimensional polarization information and compensation for atmospheric effects. We present wide-angle imaging polarimetry of the comet P/Swift-Tuttle at one pre-perihelion date near phase 45 deg.8. Our images show extended activity in the near-nucleus region, resulting probably from a single dusty jet which emerges from the rotating nucleus. We find that the polarization is higher than in typical `dusty' comets and interpret this as the contribution of fresh dust injected into the coma from the nucleus. We derive an independent value of 660 m s^-1 for the ejection velocity and compare it with that from molecular radio spectroscopy.

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