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Mountain-size asteroid will appear as a slow-moving star next month – CNET

by NEWS DESK
March 10, 2020
in TECHNOLOGY
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phaethon-asteroid-dust2-small

An artistic impression of another big asteroid: 3200 Phaethon.

Theodore R. Kareta

A huge asteroid is set to make a close pass by Earth in April, and although it's considered "potentially hazardous" to astronomers, the only show it will be putting on over the next few centuries will be in the night sky.

Asteroid 1998 OR2 is thought to be as much as 2.5 miles (4.1 km) across, which would make it comparable to a decent-size mountain in many parts of the world.

Fortunately, when it makes its next close approach on April 29, it'll pass by at a very safe distance of 4 million miles (6 million km). It's still considered potentially hazardous, though, because NASA's Center for Near Earth Studies classifies anything reasonably bright that comes within about 4.6 million miles (7.4 million km) of Earth as such. That means there's lots of potentially hazardous asteroids out there that we know of and virtually none of them are a real hazard to humans at any given moment.

But 1998 OR2 is still quite a biggun' — the biggest asteroid expected to fly by our planet in 2020, actually — which means it may be visible next month to even amateur astronomers.

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"[Skywatchers] peering through telescopes will see it as a slow-moving 'star,'" NASA solar system ambassador Eddie Irizarry writes for EarthSky. "Observers with at least 6-inch or 8-inch telescopes (the number indicates the size of the primary mirror) will see the asteroid (very slowly) moving in front of the stars."

Irizarry offers more detailed tips for spotting the space rock here.

If you don't have a big enough telescope to do your own spotting, the Rome-based Virtual Telescope Project already has you covered with a live stream that will start on April 28. VTP has already been scoping 1998 OR2 and grabbed this image of it approaching:

52768-1998or2-6mar2020-pw17
Virtual Telescope Project

And if you miss it altogether, the small-town-size rock will make an even closer (but still totally safe) fly-by in 2079. And other big space rocks will come close enough for observations in 2024 and 2027. In 2029, the mega-asteroid Apophis (which is actually a little smaller than 1998 OR2) will make a close pass that was once cause for concern.

It's since been determined that Apophis poses no threat, so enjoy the night sky watching fear-free for at least another decade unless something sneaks up on us, as sometimes happens.

Comments NASA Space Notification on Notification off Sci-Tech

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