Another asteroid is headed our way — the second this week — but there’s no need to worry.

The newly discovered space rock will pass within 39,000 miles (64,000 kilometers) of Earth on Friday afternoon. That’s less than one-fifth the distance to the moon.

Designated 2018 CB, the asteroid is an estimated 50 feet to 130 feet (15 meters to 40 meters) in size, possibly bigger than the one that exploded over Russia five years ago this month.

The manager of NASA’s Center for Near-Earth Object Studies , Paul Chodas, said asteroids this size usually don’t come this close — just once or twice a year.

While Friday’s close approach isn’t a huge deal, Chodas said in an email, “it is a reminder that asteroids can pass very close

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