The asteroid will be about 745,000 miles (1.2 million kilometers) from Earth” and It’s the largest known space rock predicted to come this close to us until 2027. According NASA, the asteroid will not be visible to the naked eye, but may be seen with the help of small telescopes and strong binoculars. From beginning, Earth will see only a portion of its illuminated side but it will gain in brightness soon. 2004 BL86 won’t pass by again for about 200 years. The best viewing for those in North and South America, Europe and Africa will range from 8 pm Monday to 1 am Tuesday (0100 GMT-0600 GMT Tuesday).An object of that size hit the planet about 65 million years ago in what is now Mexico’s Yucatan peninsula, triggering a global climate change.