Date: Night of local time 2011-04-06 to 07
Telescope: CDK125
Camera: Nikon D200
Observer: John Kielkopf

Sequential exposures of 7 Iris

See 7_iris_15s_12800iso_20110406.gif for a movie of the movement of the 
asteroid over the time interval lasting about one hour:

Thu, 07 Apr 2011 03:22:51 GMT
Thu, 07 Apr 2011 04:29:15 GMT