  Hubble Space Telescope observations of main-belt comet P/2013 P5 reveal an
extraordinary system of six dust tails that distinguish this object from any
other. Observations two weeks apart show dramatic morphological change in the
tails 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 five
months. As an inner-belt asteroid and probable Flora family member, the object
is likely to be highly metamorphosed and unlikely to contain ice. The
protracted period of dust release appears inconsistent with an impact origin,
but may be compatible with a body that is losing mass through a rotational
instability. We suggest that P/2013 P5 has been accelerated to breakup speed by
radiation torques.
