Six Tail Comet Is Called Impossible By Astronomers, Possible Alien Craft Detected, Nov 2013, UFO Sighting News.

Date of sighting: November 2013

Location of sighting: Between Mars and Jupiter

A UFO or odd asteroid that is located between Mars and Jupiter has confused astronomers. This Asteroid appears to have six streams letting loose material into space! This photo captured by the Hubble telescope has been deemed by NASA as being weird indeed. Here is a link to the original photos http://hubblesite.org/newscenter/arch... 

News Release From NASA (snippet).

RELEASE: 13-321

NASA's Hubble Sees Asteroid Spouting Six Comet-Like Tails

Astronomers viewing our solar system's asteroid belt with NASA's Hubble Space Telescope have seen for the first time an asteroid with six comet-like tails of dust radiating from it like spokes on a wheel.
Unlike all other known asteroids, which appear simply as tiny points of light, this asteroid, designated P/2013 P5, resembles a rotating lawn sprinkler. Astronomers are puzzled over the asteroid's unusual appearance.

"We were literally dumbfounded when we saw it," said lead investigator David Jewitt of the University of California at Los Angeles. "Even more amazing, its tail structures change dramatically in just 13 days as it belches out dust. That also caught us by surprise. It's hard to believe we're looking at an asteroid."