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}
}
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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