From Physics News Update, an e-zibne:

POSSIBLE NEW PLANETS in our solar system have been spotted
recently. Reservations about claiming new planets arises not from
anything to do with the observations, but with semantics; there is
no universally accepted definition for planet. Even Pluto is not a
planet according to some scientists. The two newest planet
candidates are the latest residents to be discerned in the Kuiper
Belt, the zone of debris material beyond the orbit of Neptune. Two
earlier specimens go by the name of Sedna
(www.aip.org/pnu/2004/split/677-1.html) and Quaoar
(www.aip.org/pnu/2002/split/608-3.html). One of the new objects,
discovered by astronomers at the Sierra Nevada Observatory in Spain,
is called EL61, with an orbital radius of about 51 AU (1 AU, or
astronomical unit, is equal to the Earth-sun distance) and a size
about 2/3 that of Pluto (which itself orbits at a distance of about
32 AU). The other object is called UB313 and was spotted by
astronomers at the Palomar observatory in California and the Gemini
telescope in Hawaii. It orbits at a distance of 97 AU and has an
estimated size larger than Pluto).

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