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The nuclei of comets 7P/Pons-Winnecke, 14P/Wolf and 92P/Sanguin

Snodgrass, C.; Fitzsimmons, A. and Lowry, S. C. (2005). The nuclei of comets 7P/Pons-Winnecke, 14P/Wolf and 92P/Sanguin. Astronomy & Astrophysics, 444(1) pp. 287–295.

DOI (Digital Object Identifier) Link: https://doi.org/10.1051/0004-6361:20053237
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Abstract

Jupiter Family comets (JFCs) are short period comets which have recently entered the inner solar system, having previously orbited in the Kuiper Belt since the formation of the planets. We used two nights on the 3.6 m New Technology Telescope (NTT) at the European Southern Observatory, to obtain VRI photometry of three JFCs; 7P/Pons-Winnecke, 14P/Wolf and 92P/Sanguin. These were observed to be stellar in appearance. We find mean effective radii of 2.24 ± 0.02 km for 7P, 3.16 ± 0.01 km for 14P and 2.08 ± 0.01 km for 92P, assuming a geometric albedo of 0.04. From light-curves for each comet we find rotation periods of 7.53 ± 0.10 and 6.22 ± 0.05 h for 14P and 92P respectively. 7P exhibits brightness variations which imply a rotation period of 6.8 ≤ Prot ≤ 9.5 h. Assuming the nuclei to be ellipsoidal the measured brightness variations imply minimum axial ratios a/b of 1.3 ± 0.1 for 7P and 1.7 ± 0.1 for both 14P and 92P. This in turn implies minimum densities of 0.23 ± 0.08 g cm-3 for 7P, 0.32 ± 0.02 g cm-3 for 14P and 0.49 ± 0.06 g cm-3 for 92P. Finally, we measure colour indices of (V-R) = 0.40 ± 0.05 and (R-I) = 0.41 ± 0.06 for 7P/Pons-Winnecke, (V-R) = 0.57 ± 0.07 and (R-I) = 0.51 ± 0.06 for 14P/Wolf, and (V-R) = 0.54 ± 0.04 and (R-I) = 0.54 ± 0.04 for 92P/Sanguin.

Item Type: Journal Item
Copyright Holders: 2005 ESO
ISSN: 1432-0746
Keywords: comets; photometric techniques
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Space
Item ID: 43119
Depositing User: Colin Snodgrass
Date Deposited: 26 May 2015 10:21
Last Modified: 07 Dec 2018 10:31
URI: http://oro.open.ac.uk/id/eprint/43119
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