A big – very big – asteroid will pass relatively close to Earth on April 29, 2020. Asteroid (52768) 1998 OR2 will pass at a safe distance, at some 4 million miles (6 million km), or about 16 times the Earth-moon distance. It’ll be the biggest asteroid to fly by Earth this year (that we know about so far); according to current estimates, it’s probably a bit over a mile wide (2 km) and maybe twice that long. Closest approach will be April 29 around 5:56 a.m. Eastern Daylight Time (09:56 UTC; translate UTC to your time). Professional observatories have been pointing their telescopes at the huge space rock already. Amateur astronomers with smaller telescopes will also have an opportunity to see it as a slow-moving “star.” If that’s you, we give charts and tips for observers at the bottom of this post that should help.
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