When is a comet not a comet?

[unable to retrieve full-text content]Astronomers using the NASA/ESA Hubble Space Telescope have observed a unique and baffling object in the asteroid belt that looks like a rotating lawn sprinkler or badminton shuttlecock. While this object is on an asteroid-like orbit, it looks like a comet, and is sending out tails of dust into space.Source: http://www.sciencedaily.com/releases/2013/11/131107123148.htm
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