Evidence for Fresh Frost Layer on the Bare Nucleus of Comet Hale-Bopp at 32 AU Distance

@article{Szabo2012EvidenceFF,
  title={Evidence for Fresh Frost Layer on the Bare Nucleus of Comet Hale-Bopp at 32 AU Distance},
  author={G. Szab́o and L. Kiss and A. P{\'a}l and C. Kiss and K. S'arneczky and A. Juh'asz and M. Hogerheijde},
  journal={The Astrophysical Journal},
  year={2012},
  volume={761},
  pages={8}
}
  • G. Szab́o, L. Kiss, +4 authors M. Hogerheijde
  • Published 2012
  • Physics
  • 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… CONTINUE READING

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