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Hubble Space Telescope observations of main-belt comet P/2013 P5 reveal anextraordinary system of six dust tails that distinguish this object from anyother. Observations two weeks apart show dramatic morphological change in thetails while providing no evidence for secular fading of the object as a whole.Each tail is associated with a unique ejection date, revealing continued,episodic mass loss from the 0.24+/-0.04 km radius nucleus over the last fivemonths. As an inner-belt asteroid and probable Flora family member, the objectis likely to be highly metamorphosed and unlikely to contain ice. Theprotracted period of dust release appears inconsistent with an impact origin,but may be compatible with a body that is losing mass through a rotationalinstability. We suggest that P/2013 P5 has been accelerated to breakup speed byradiation torques.

The Extraordinary Multi-Tailed Main-Belt Comet P/2013 P5