Rotation of the Nucleus, Gas Kinematics and Emission Pattern of Comet 8P-Tuttle: Preliminary Results from Optical Imaging of the CN ComaReport as inadecuate




Rotation of the Nucleus, Gas Kinematics and Emission Pattern of Comet 8P-Tuttle: Preliminary Results from Optical Imaging of the CN Coma - Download this document for free, or read online. Document in PDF available to download.

Earth, Moon, and Planets

, Volume 105, Issue 2–4, pp 327–342

First Online: 18 June 2009Received: 29 December 2008Accepted: 28 May 2009

Abstract

We present preliminary results of the narrow-band CN observations of comet 8P-Tuttle from early January 2008, realized as part of a project consisting of near-simultaneous spectroscopic monitoring of HCN at millimeter-wavelengths and optical imaging of the coma. The mean-image subtraction method revealed low-contrast CN envelopes. Using the image cross-correlation technique we measured the projected velocity of these shells. For the sunward part we found it to be equal to 0.96 ± 0.03 km s on January 4 and 1.10 ± 0.01 km s on January 9, whereas the anti-sunward part reached 0.73 ± 0.05 and 0.80 ± 0.02 km s, respectively. The periodicity of gas emission was investigated using a repeatability of the shells, their kinematics, and an aperture photometry of the near nucleus region. We found a period of 5.70 ± 0.07 h along with multiples, consistent with previous findings by other authors. A toy Monte Carlo model was implemented to reproduce the time-series of the CN images. We show that emission of HCN into a relatively wide cone by a single active region on a rotating nucleus is the most probable scenario.

KeywordsComets Comet 8P-Tuttle CN coma Gas emission Nucleus rotation Electronic supplementary materialThe online version of this article doi:10.1007-s11038-009-9326-7 contains supplementary material, which is available to authorized users.

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Author: W. Waniak - G. Borisov - M. Drahus - T. Bonev - K. Czart - M. Küppers

Source: https://link.springer.com/







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