Oddly Tilted Asteroid Offers Clues to Comets' Origin

Canadian, French and U.S. astronomers have found a strange asteroid with an odd orbit which could help explain the origin of comets, the National Research Council of Canada reported Thursday.
"The asteroid, currently named 2008 KV42, is orbiting the sun backwards and almost perpendicular to the orbits of the planets -- a 104 degree tilt. This odd orbit suggests that 2008 KV42 may have been pulled into our solar system from the Oort Cloud," the council said in a statement.
The Oort cloud is a theoretical sphere surrounding the solar system but far out from it. It is believed to hold billions of comets. The discovery could shed light on how they transition from the cloud into objects like Halley's Comet.
"Although we've been specifically looking for highly-tilted (beyond) trans-Neptunians for some time now, we didn't expect to find a retrograde one," said JJ Kavelaars of the council. "A number of theories on the formation of the outer solar system have suggested that such things might be out there, but observational searches for them are very difficult."
The difficulty is these objects are extremely rare. Astronomers have surveyed most of the northern sky for objects of this type, but have found only one other that may belong to the same class as 2008 KV42. The Deep Ecliptic Survey discovered the asteroid 2002 XU93, which has a 77 degree tilt.
The new asteroid was discovered using the Canada-France-Hawaii telescope in Hawaii. The observations were followed up in Arizona and Chile.

source: Discovery News