Active Asteroid P/2017 S5 (ATLAS).

@article{Jewitt2018ActiveAP,
  title={Active Asteroid P/2017 S5 (ATLAS).},
  author={D. Jewitt and Yoonyoung Kim and J. Rajagopal and S. Ridgway and R. Kotulla and Wilson M. Liu and M. Mutchler and J. Li and H. Weaver and S. Larson},
  journal={arXiv: Earth and Planetary Astrophysics},
  year={2018}
}
Observations of active asteroid P/2017 S5 when near perihelion reveal the ejection of large (0.1 to 10 mm) particles at 0.2 to 2 m/s speeds, with estimated mass-loss rates of a few kg/s. The protracted nature of the mass loss (continuous over 150 days) is compatible with a sublimation origin, meaning that this object is likely an ice-bearing main-belt comet. Equilibrium sublimation of exposed water ice covering as little as 0.1 sq. km can match the data. Observations a year after perihelion… Expand

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