New Planet(s)?

OK, now which is the 10th Planet?

I have just read an article on BBC News that reports a new planet called Sedna, but a couple of years ago they also reported a new planet called Quaoar. So do we have 11 planets (or more) in our Solar System?

Planet Distance from
Sun (Miles)
Planet Size
(Miles)
Original
Designation
BBC
News
Wikipedia
Info
 Quaoar 4 Billion 800 2002 LM60 Link Link
 Sedna 3.6 billion 730-1,470 2003 VB12 Link Link