Polarimetric Imager for Comets, PICO

Details Polarimetric Imager for Comets, PICO Polarimetric Imager for Comets, PICO

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007pasj...59.1017i&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.59, No.5, pp.1017--1025

Astronomy and Astrophysics

Astronomy

Comets: General, Instrumentation: Polarimeters, Ism: Dust, Techniques: Polarimetric

Scientific paper

We constructed an imaging polarimeter, PICO, that was optimized for comets and/or cometary objects. PICO has a field-of-view of 5' × 10' and employs a fixed Wollaston prism as an analyzer. In the case of polarimeters using a double-beam prism, such as a Wollaston prism, lateral chromatic aberrations originating from the prism often degrade the image quality and measurement accuracy. However, PICO suffers little lateral chromatic aberration due to compensation provided by newly designed lens systems that generate opposite lateral colors. Owing to this design, PICO can obtain highly resolved and very accurate polarization images throughout the FOV (field-of-view). The total accuracy is estimated to be ΔP ≃ [(P / 85)2 + 0.32]1/2 % in polarization degree and θ ≤ 3° in position angle; these values are satisfactory for cometary studies.

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