From the Sun's print editions:
The close flyby Tuesday at 6:28 p.m. of asteroid 2005 YU55 will be a "boon for astronomers to study it with some high-tech instruments" but won’t be visible to the average stargazer, says David Ludwikoski, assistant professor of science at the Community College of Baltimore County, who hosts star parties at the school’s Banneker Planetarium.
“The neat thing is it’s probably the closest in recent memory anything has come this close to the Earth,” he says. “And it’s a nice plus for us that we’ve been able to detect something this small with the technology we have.”
Read more about the asteroid and NASA's tracking program here.