asteroid 2005 yu55: how big is huge asteroid?

Near Earth Object Asteroid 2005 YU55 will pass within moon's orbit on Nov 8th at a distance no closer than 203,000 miles from Earth. An animation of the close flyby is available here. A Space.com article, "Huge Asteroid to Pass Near Earth in November," terms the quarter mile diameter asteroid as huge and on the potentially dangerous list. There will be radar studies done by Arecibo and Goldstone Observatories of this unusual opportunity. How close will the asteroid be to the Moon? The only source providing a distance here, says, 149,000 miles. You will still need a telescope to view it late on Nov 8th or early Nov 9th.