A huge asteroid is headed toward Earth, and NASA says that all it will take is a pair of binoculars to catch a glimpse of it as it makes its closest approach later this month.

The asteroid 2004 BL86 is about a third of a mile in size and will come within approximately 745,000 miles (1.2 million kilometers) of Earth on Jan. 26. NASA said it will be the closest any space rock comes to Earth until asteroid 1999 AN10 flies past in 2027.

The 2004 BL86 asteroid is expected to pass safely by.

"While it poses no threat to Earth for the foreseeable future, it's a relatively close approach by a relatively large asteroid, so it provides us a unique opportunity to observe and learn more," Don Yeomans, manager of NASA's Near Earth Object Program Office at the Jet Propulsion Laboratory in Pasadena, California, said.

NASA's Deep Space Network antenna at Goldstone, California, and the Arecibo Observatory in Puerto Rico will attempt to acquire science data and radar-generated images of the asteroid during the days surrounding its closest approach to Earth.

"When we get our radar data back the day after the flyby, we will have the first detailed images," said radar astronomer Lance Benner of Jet Propulsion Laboratory, the principal investigator for the Goldstone radar observations of the asteroid. "At present, we know almost nothing about the asteroid, so there are bound to be surprises."

The asteroid - which won't come this close again for 200 years - may also be seen by amateur astronomers in the Northern Hemisphere with small telescopes or even binoculars.

"I may grab my favorite binoculars and give it a shot myself," Yeomans said. "Asteroids are something special. Not only did asteroids provide Earth with the building blocks of life and much of its water, but in the future, they will become valuable resources for mineral ores and other vital natural resources. They will also become the fueling stops for humanity as we continue to explore our solar system."

Asteroid 2004 BL86 was initially discovered on Jan. 30, 2004 by a telescope of the Lincoln Near-Earth Asteroid Research (LINEAR) survey in White Sands, New Mexico.

While 2004 BL86 is getting plenty of attention, it is only the latest space rock to make a run at Earth. In September, 20214 RC (R-C) came within 25,000 miles.