What time will asteroid 2005 YU55 be visible over Wisconsin?

you're not going to see it with the naked eye.

here is something i posted earlier on a friend's facebook page. she too was interested in seeing it.

You won't see it with the naked eye. Imagine an aircraft carrier 201,700 miles from earth. That's pretty tiny. Online sources state that you need at least an 80mm objective lens to even be able to find it. Nowhere have I been able to find o...ut what sort of magnification is needed to get a decent enlargement and then can the lenses even focus on the darn thing that far. My radar system has a camera with a 180mm objective lense and can see even airplanes refueling off the tankers out in the gulf of mexico, but with combined air temperature and distance, it's hard to even get good focus on what's out there, so it's not even worth my time to use the radar's cameras to 'attempt' to find this YU55 asteroid 201,700 miles away.

Not Naked Eye Visible, or Binocular, or cheap telescope, you need a 6" scope at minimum. See details here.

Looking at the chart, it appears as though you'll be able to see it all night if looking near Pegasus. At 10pm to 11pm it will be close to one of the bright stars in the great square. With a large powerful scope, it would just look like a slow moving satellite against the background of stars.