A Comet Active Beyond the Crystallization Zone

@article{Jewitt2017ACA,
  title={A Comet Active Beyond the Crystallization Zone},
  author={David C. Jewitt and Man-To Hui and Max J. Mutchler and H. Weaver and Jing Li and Jessica Agarwal},
  journal={The Astrophysical Journal Letters},
  year={2017},
  volume={847}
}
We present observations showing inbound long-period comet C/2017 K2 (PANSTARRS) to be active at a record heliocentric distance. Nucleus temperatures are too low (60–70 K) either for water ice to sublimate or for amorphous ice to crystallize, requiring another source for the observed activity. Using the Hubble Space Telescope we find a sharply bounded, circularly symmetric dust coma 105 km in radius, with a total scattering cross-section of ∼105 km2. The coma has a logarithmic surface brightness… 

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