At a calculated yield = 200 Gigatons (TNT-Eqv) it could smart 'just as bad as if it were!!!'
(Note - if viewed much after 5/15/04 ~ 13:00 (UTC) the info linked above won't likely be very interesting)
So buy yourself a turkey ranch, observe thanksgiving on the fourth and luxuriate in life made better through catastrophism!
Ahem! Speaking of PX???
PS To anyone worrying about 2004-JO2 --- A single word --Don't!!!