It travelled at a distance of 1.8 million km and was placed under the ‘Potentially Hazardous Asteroids’ category. The Near-Earth asteroids are further classified as:Atiras: these are objects whose orbits are smaller than the Earth's orbit, and they are within the Earth’s orbit as well. Atens and Apollos: these are Earth-crossers (they cross the Earth’s orbit) with orbits near the Earth's orbit. Potentially Hazardous Asteroids: Any of the near-Earth asteroids can become potentially hazardous ones if their distance from the Earth is below 0.5 astronomical units or 7.5 million km. “There are thousands of Potentially Hazardous Asteroids.

Source:   The Hindu
January 03, 2018 13:41 UTC