Polarimetry and Photometry of Comet C/2004 Q2 (Machholz) |
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| Authors: | Sergey Velichko Nikolai Kiselev Feodor Velichko |
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| Institution: | (1) School of Physics, Karazin Kharkiv National University, 4 Svobody Sq., 61077 Kharkiv, Ukraine;(2) Institute of Astronomy, Karazin Kharkiv National University, 35 Sums’ka Str., 61022 Kharkiv, Ukraine |
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| Abstract: | We present results of polarimetry and photometry of comet C/2004 Q2 (Machholz) obtained with the 0.7-m telescope of Institute of Astronomy at the Karazin Kharkiv National University on February 3 and 4, and March 4 and 14, 2005. The observations were carried out with a one-channel photoelectric photometer-polarimeter. The IHW continuum UC (λ3650/80 Å), BC (λ4845/65 Å), RC (λ6840/90 Å) and emission filters CN (λ3871/50 Å), C3 (λ4060/70 Å), and C2 (λ5140/90 Å) were used. Degree of the comet polarization at phase angles ≈ 52° and ≈44° in the red continuum was close to that for so called dusty comets. The comet had a typical spectral gradient of polarization ΔP/Δλ=0.86% per 1000 Å. In the framework of the Haser model we have found the gas production rates Q of the CN, C3 and C2 species and the dust production rates Afρ on February 4 and March 14, 2005. The ratio logAfρ (BC)/Q(CN)] was compared with data for other comets. The normalized spectral gradient of cometary dust S’(BC,RC) was 8.7%/1000 Å for February 4 and 17.0%/1000 Å for March 14. We conclude that comet C/2004 Q2 (Machholz) in many respects is a typical dusty comet. |
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| Keywords: | Comets C/2004 Q2 (Machholz) polarization photometry |
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