Stadium-size asteroid will safely fly by Earth tonight

While 2020 continues to be a difficult year, there is a little good news to look forward to tonight (June 5): a near-Earth asteroid will whiz safely by our planet, and astronomers may be able to see the monster rock's flight through telescopes.

The asteroid (opens in new tab), known as 2002 NN4, is approaching Earth – but fortunately, not too closely. The space rock will fly by at the equivalent of 13.25 times the distance between Earth and the moon (opens in new tab), which is roughly 3.2 million miles (5.2 million kilometers) from our planet. The asteroid's closest approach to us will be at 11:20 p.m. EDT (0320 GMT June 6).

Asteroid 2002 NN4 is more remarkable for its size, with an estimated diameter of between 820 feet and 1,870 feet (250 meters to 570 meters). That's more than a dozen times larger than the object that slammed into the atmosphere above Chelyabinsk, Russia in 2013 (opens in new tab), which had a diameter of roughly 66 feet (20 meters).

Video: Stadium-size asteroid 2002 NN4 orbit animation (opens in new tab)
Related:
Potentially dangerous asteroids (images) (opens in new tab)

An artist's illustration of a near-Earth asteroid. (Image credit: Shutterstock)

While the asteroid is big, it is quite dim in all but the largest telescopes. It has a magnitude of just 20, according to NASA's Jet Propulsion Laboratory NEO Earth Close Approaches database (opens in new tab). For reference, that's even dimmer than the dwarf planet Pluto. The faintest naked-eye stars are around magnitude (opens in new tab) 6, and a typical six-inch telescope can see stars of around magnitude 13 or 14.

Astronomy broadcasting service Slooh (opens in new tab) will hold a members-only star party tonight, as long as the weather holds out for their network of telescopes. The party is expected to start at 10:30 p.m. EDT June 5 (0230 GMT June 6) featuring Mike Shaw, host of the weekly audio show "Nightscapes." (The online observatory is currently offering annual memberships to students for $20, and individual memberships are $100 annually.)

NASA and a network of partner telescopes regularly scan the skies for potentially threatening near-Earth asteroids (opens in new tab). Fortunately, the agency has found no imminent threats to our planet — but the search continues, just in case. 

Studying asteroids and other small objects also helps astronomers learn more about how the solar system formed, since these small worlds were in our neighborhood 4.5 billion years ago (opens in new tab) when our sun and the planets were only just beginning to coalesce and grow. 

Follow Elizabeth Howell on Twitter @howellspace. Follow us on Twitter @Spacedotcom and on Facebook

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Elizabeth Howell
Staff Writer, Spaceflight

Elizabeth Howell, Ph.D., is a staff writer in the spaceflight channel since 2022. She was contributing writer for Space.com (opens in new tab) for 10 years before that, since 2012. Elizabeth's reporting includes an exclusive with Office of the Vice-President of the United States, speaking several times with the International Space Station, witnessing five human spaceflight launches on two continents, working inside a spacesuit, and participating in a simulated Mars mission. Her latest book, "Why Am I Taller?", is co-written with astronaut Dave Williams. Elizabeth holds a Ph.D. and M.Sc. in Space Studies from the University of North Dakota, a Bachelor of Journalism from Canada's Carleton University and (soon) a Bachelor of History from Athabasca University. Elizabeth is also a post-secondary instructor in communications and science since 2015. Elizabeth first got interested in space after watching the movie Apollo 13 in 1996, and still wants to be an astronaut someday. Mastodon: https://qoto.org/@howellspace

  • FRAS
    From your article:

    "It has a magnitude of just 20, according to NASA's Jet Propulsion Laboratory NEO Earth Close Approaches database. For reference, that's even dimmer than the dwarf planet Pluto. The faintest naked-eye stars are around magnitude 6, and a typical six-inch telescope can see stars of around magnitude 13 or 14. "

    There is confusion here between magnitude and absolute magnitude.

    It has an absolute magnitude (H) of 20. This object recently reached 14th magnitude, had it had a closer approach it would have become even brighter. In 2130 it will have a closer approach where it will become brighter than 13th magnitude...
    Reply