# EVIDENCE FOR FRESH FROST LAYER ON THE BARE NUCLEUS OF COMET HALE–BOPP AT 32 AU DISTANCE

@article{Szab2012EVIDENCEFF,
title={EVIDENCE FOR FRESH FROST LAYER ON THE BARE NUCLEUS OF COMET HALE–BOPP AT 32 AU DISTANCE},
author={Gyula M. Szab{\'o} and L{\'a}szl{\'o} L. Kiss and Andr{\'a}s P{\'a}l and Cs. P. Kiss and Kriszti{\'a}n S{\'a}rneczky and Attila Juh{\'a}sz and Michiel R. Hogerheijde},
journal={The Astrophysical Journal},
year={2012},
volume={761}
}
• Published 10 October 2012
• Physics, Geology
• The Astrophysical Journal
Here, we report that the activity of comet Hale–Bopp ceased between late 2007 and 2009 March, at about 28 AU distance from the Sun. At that time, the comet resided at a distance from the Sun that exceeded the freeze-out distance of regular comets by an order of magnitude. A Herschel Space Observatory PACS scan was taken in mid-2010, in the already inactive state of the nucleus. The albedo has been found to be surprisingly large (8.1% ± 0.9%), which exceeds the value known for any other comets…

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