Polarimetric Imager for Comets : PICO

Details Polarimetric Imager for Comets : PICO Polarimetric Imager for Comets : PICO

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005dps....37.1607f&link_type=abstract

American Astronomical Society, DPS meeting #37, #16.07; Bulletin of the American Astronomical Society, Vol. 37, p.646

Astronomy and Astrophysics

Astronomy

Scientific paper

We developed the optical polarimetric imager (named ``PICO") for the study on cometary dust grains. In order to avoid the influences on measurements caused by the change in sky conditions, the PICO was designed as a double-beam type polarimeter (for linear polarization). Here we introduce some recent results by PICO for comet C/2002 T7 (LINEAR), C/2001 Q4 (NEAT), 81P/Gehrels 2, and C/2004 Q4 (Machholz) in 2003 --- 2005. Usually I-band (Kron-Cousins) or i'-band (Gunn) filter was used to obtain the images of the reflected sunlight by cometary dust grains (we used some narrow-band filters for a bright comet only). Comet C/2001 Q4 (NEAT) showed a prominent jet feature (higher polarized region) in the map of polarization degree at near its perihelion passage. We discuss on this higher polarized region.

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