A small asteroid will make a close pass by the Earth today. Asteroid D-X 110 measures about 45 to 130 feet across.

At its closest, it will be within the distance of the earth to the moon.

Paul Chodas, Research scientist at NASA's Jet Propulsion Laboratory says its detection is part of NASA's ongoing effort to spot objects that pose a threat to the planet. 

"In the course of finding the large ones, we also find some of these fairly small ones. If this had been heading for the earth, we would have had a number of days warning," Chodas said. 

Chodas says the asteroid would have created a shock wave if it entered the atmosphere but doubts it would have reached Earth intact.