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Active Asteroid P/2017 S5 (ATLAS)
David Jewitt, Yoonyoung Kim, Jayadev Rajagopal +7
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…
Distant Comet C/2017 K2 and the Cohesion Bottleneck
David Jewitt, Jessica Agarwal, Man-To Hui +3
Distant long-period comet C/2017 K2 has been outside the planetary region of the solar system for 3 Myr, negating the possibility that heat retained from the previous perihelion co…
Hubble Space Telescope Observations of 3200 Phaethon At Closest Approach
David Jewitt, Max Mutchler, Jessica Agarwal +1
We present Hubble Space Telescope observations of the active asteroid (and Geminid stream parent) 3200 Phaethon when at its closest approach to Earth (separation 0.07 AU) in 2017 D…
The Nucleus of Active Asteroid 311P/(2013 P5) PANSTARRS
David Jewitt, Harold Weaver, Max Mutchler +3
The unique inner-belt asteroid 311P/PANSTARRS (formerly P/2013 P5) is notable for its sporadic, comet-like ejection of dust in nine distinct epochs spread over 250 days in 20…