NASA warns that two asteroids are buzzing Earth this weekend in 20,000 mph graze.

Astronomers call the newfound asteroid 2018 RC and you can watch its approach in a live webcast tonight (Sept. 8). 2018 RC is about the size of a jumbo jet, according to NASA’s Asteroid Watch team.

The Asteroid Terrestrial-impact Last Alert System (ATLAS) in Hawaii, discovered it on September 3. The asteroid will pass within 136,000 miles (220,000 kilometers) of the Earth at its closest approach on Sunday. That’s well inside the moon’s average distance of 238,000 miles (385,000 kilometers).

The Virtual Telescope Project, an online observatory founded by astrophysicist Gianluca Masi of the Bellatrix Astronomical Observatory in Ceccano, Italy, will host a live webcast this evening starting at 6 p.m. EDT (2200 GMT), and you can watch it live here.

2018 RC will follow another smalle asteroid, named 2018 RW, which was only spotted by astronomers on Friday (Sept. 7). 2018 RW was traveling around 15 times faster than the retired Concorde’s 1,354mph and closer than 2018 RC.

However, NASA didn’t find the rock (2018 RW) until the day after.

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