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

Content Provider	Springer Nature Link
Author	Velichko, Sergey Kiselev, Nikolai Velichko, Feodor
Copyright Year	2006
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), C$_{3}$ (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, C$_{3}$ and C$_{2}$ 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.
Starting Page	379
Ending Page	386
Page Count	8
File Format	PDF
ISSN	01679295
Journal	Earth, Moon, and Planets
Volume Number	97
Issue Number	3-4
e-ISSN	15730794
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2006-09-06
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Comets C/2004 Q2 (Machholz) polarization photometry Astrophysics Extraterrestrial Physics, Space Sciences Planetology Astronomy
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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