Polarimetry and Photometry of Comet C/2004 Q2 (Machholz)

Details Polarimetry and Photometry of Comet C/2004 Q2 (Machholz) Polarimetry and Photometry of Comet C/2004 Q2 (Machholz)

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005em%26p...97..379v&link_type=abstract

Earth, Moon, and Planets, Volume 97, Issue 3-4, pp. 379-386

Astronomy and Astrophysics

Astronomy

1

Comets, C/2004 Q2 (Machholz), Polarization, Photometry

Scientific paper

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 log[Afρ (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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