Active Asteroid P/2017 S5 (ATLAS)

  title={Active Asteroid P/2017 S5 (ATLAS)},
  author={David C. Jewitt and Yoonyoung Kim and Jayadev Rajagopal and Susan E. Ridgway and Ralf Kotulla and Wilson M. Liu and Max J. Mutchler and Jing Li and H. Weaver and Stephen M. Larson},
  journal={The Astronomical Journal},
Observations of active asteroid P/2017 S5 when near perihelion reveal the ejection of large (102–104 μm) particles at 0.2–2 m s−1 speeds, with estimated mass-loss rates of a few kg s−1. 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 km2 can match the data. Observations a year after perihelion show… 
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