Negative wavelength gradient of polarization of Comet 21P/Giacobini-Zinner as an indicator of organic matter in its dust particles

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Scientific paper

An unusual behaviour of the polarization of light scattered on dust particles in Comet 21P/Giacobini--Zinner is discussed. CCD imaging polarimetry of Comet Giacobini--Zinner was carried out at the 2-m telescope of the Pik Terskol Observatory (Northern Caucasus) on November 20, 1998 and January 25, 1999 using a two-channel focal reducer of the Max-Planck-Institute for Aeronomy (Germany). Narrow-band continuum filters centered at 4430/44 Å (blue continuum) and at 6420/26 Å (red continuum) were used. The comet was also observed in a wide-band red (7228/1140 Å) filter with the 70-cm reflector at the Observatory of Kharkiv National University on November 19--22, 1998.

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