Near-nucleus Photometry Of Outbursting Comet 17p/Holmes

Mathematics – Logic

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Scientific paper

The outburst of comet 17P/Holmes was the largest in recorded history, causing the comet to brighten by a factor of almost a million in under 24 hours. We observed the aftermath using the wide field camera MegaCam on the 3.6m Canada-France-Hawaii telescope atop Mauna Kea between 2007 Nov. 6 UT and 2008 Feb. 12 UT. The nucleus and coma faded systematically in the months following the outburst, with one apparent brightening occurring on 2007 Nov. 12 UT, suggesting the surface of the nucleus remained unstable and active. We will present photometry of the near-nucleus region and the surrounding coma and an analysis of the time-dependent surface brightness profile. An analysis of the morphological (as opposed to photometric) aspects of 17P/Holmes from the same CFHT data-set has recently been published (AJ (2010), 139, 2230-2240).

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