--- title: A Massive Asteroid Will Fly Past Earth Next Month description: The potentially hazardous asteroid named 2002 AJ129 will pass by, just 2.6 million miles from Earth. canonical: https://time.com/5107838/asteroid-2002-aj129-fly-pass-earth-space-rock/ author: Talia Avakian article:opinion: false article:content_tier: free article:published_time: 2018-01-18T21:24:06.000Z article:modified_time: 2026-02-23T18:55:18.742Z article:section: Science og:title: A Huge Asteroid Will Fly by Earth Next Month og:description: The massive space rock is bigger than the world's tallest building. og:url: https://time.com/5107838/asteroid-2002-aj129-fly-pass-earth-space-rock/ og:site_name: TIME og:image: https://static.time.com/v3/assets/bltea6093859af6183b/bltb2ae78a01d8081bc/6988f8b197cdff78356b3fc6/asteroid.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 og:image:width: 3841 og:image:height: 2161 og:image:alt: Near-Earth asteroids, artwork og:type: article twitter:card: summary_large_image twitter:title: A Huge Asteroid Will Fly by Earth Next Month twitter:description: The massive space rock is bigger than the world's tallest building. twitter:image: https://static.time.com/v3/assets/bltea6093859af6183b/bltb2ae78a01d8081bc/6988f8b197cdff78356b3fc6/asteroid.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 ---  # An Asteroid Bigger Than the World's Tallest Building Will Fly by Earth Next Month > Sponsored content. 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Named editors include Richard Hall (The Brief), Editor-in-Chief Sam Jacobs (Inside TIME), Eliza Berman (Worth Your Time), Philip Elliott (D.C. Brief), Justin Worland (Future Proof) and Harry Booth (In the Loop). Health Matters is written by TIME's health desk. #### How do I sign up for a TIME newsletter? Go to time.com/newsletters, choose the newsletters you want and enter your email address. There is no cost and no subscription requirement. by [Talia Avakian](https://time.com/author/talia-avakian/) ## Talia Avakian Jan 18, 2018 9:24 PM UTC  Near-Earth asteroids illustration. Near-Earth asteroids illustration. Detlev Van Ravenswaay—Getty Images/Science Photo Library RM by [Talia Avakian](https://time.com/author/talia-avakian/) ## Talia Avakian Jan 18, 2018 9:24 PM UTC A massive “potentially hazardous” [asteroid](http://time.com/5077498/the-skull-shaped-halloween-asteroid-is-coming-back-in-2018/) spanning more than the length of the world’s tallest building will fly by our planet on [Feb. 4\. ](https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=276033;old=0;orb=0;cov=0;log=0;cad=1#cad) The roughly .7-mile long asteroid is considered longer than the [Burj Khalifa](http://www.thedrive.com/design/1484/drive-wire-the-burj-khalifa-the-worlds-tallest-building), which at .5 miles high currently stands as the world’s tallest building, and will fly at a speed of 67,000 miles per hour just 2.6 million miles from Earth. “This is a fairly routine close approach of an object that we have known about for many years,” said Paul Chodas who manages the Center for Near Earth Object Studies at NASA’s [Jet Propulsion Laboratory.](https://www.jpl.nasa.gov/) Asteroid 2002 AJ192 was discovered in 2002. “We’ve been tracking it since then so we know its trajectory very accurately and predicted this close approach years ago,” Chodas added. “Close approaches of near-earth objects happen almost daily, and many of them are closer than this.” > [](https://twitter.com/moskvine/status/954035134621200384) Thanks to its reach and size, the asteroid is classified as “potentially hazardous” by NASA, but it’s one of [over 1,000 asteroids and comets](https://apod.nasa.gov/apod/ap130812.html) scientists currently know about that falls under this category. Technically the asteroid’s current size remains unknown and it has been estimated based on typical reflectivity, said Chodas. That’s part of the reason why the asteroid’s upcoming flyby is gaining attention. Under [NASA’s classifications](https://www.nasa.gov/planetarydefense/faq), any asteroid or comet predicted to travel anywhere within 0.05 Astronomical Units (or reaching under 5 million miles) of Earth’s orbit and that has a size of at least 30 meters or more is deemed “potentially hazardous.” “We know that this particular object is not one of the ones that has any chance of hitting the Earth in the next 100 years; there are no asteroids that we know of that have any significant chance of hitting the Earth over the next 100 years, but you never know what we find out in our discoveries,” Chobas said. Though 2002 AJ129 is far enough from Earth’s orbit to avoid any collisions, scientists plan to continue closely observing the rock and others like it using both the [Goldstone Radio Telescope](https://www.gdscc.nasa.gov) in California and the [Arecibo telescope](http://time.com/4475600/not-so-close-encounters/) in Puerto Rico. They also have even been looking into technology that would allow them to deflect asteroids from a distance. Last year scientists began working on the [Double Asteroid Reflection Test (DART)](https://www.nasa.gov/feature/nasa-s-first-asteroid-deflection-mission-enters-next-design-phase), which would allow them to strike the asteroid as its approaching Earth to shift its orbit through a technique known as kinetic impactor. The first test with DART is planned for October of 2022 and again in 2024. ```json [{"@context":"https://schema.org","@type":"NewsArticle","@id":"https://time.com/5107838/asteroid-2002-aj129-fly-pass-earth-space-rock/","mainEntityOfPage":{"@type":"WebPage","@id":"https://time.com/5107838/asteroid-2002-aj129-fly-pass-earth-space-rock/"},"headline":"An Asteroid Bigger Than the World's Tallest Building Will Fly by Earth Next Month","datePublished":"2018-01-18T21:24:06.000Z","dateModified":"2026-02-23T18:55:18.742Z","description":"The .7-mile long asteroid is longer than the Burj Khalifa, which at .5 miles high currently stands as the world’s tallest building","url":"https://time.com/5107838/asteroid-2002-aj129-fly-pass-earth-space-rock/","keywords":["asteroid","onetime"],"thumbnailUrl":"https://static.time.com/v3/assets/bltea6093859af6183b/bltb2ae78a01d8081bc/6988f8b197cdff78356b3fc6/asteroid.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","author":[{"@type":"Person","name":"Talia Avakian","jobTitle":null,"url":"https://time.com/author/talia-avakian/"}],"articleSection":"Science","image":[{"@type":"ImageObject","url":"https://static.time.com/v3/assets/bltea6093859af6183b/bltb2ae78a01d8081bc/6988f8b197cdff78356b3fc6/asteroid.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","width":1200,"height":675,"headline":"Near-Earth asteroids, artwork","caption":"Near-Earth asteroids, artwork","creditText":"Detlev Van Ravenswaay—Getty Images/Science Photo Library RM","representativeOfPage":true}],"publisher":{"@type":"Organization","name":"Time","url":"https://time.com/","logo":{"@type":"ImageObject","url":"https://time.com/images/logo.png","width":528,"height":156},"foundingDate":"March 3, 1923","sameAs":["https://www.facebook.com/time","https://www.instagram.com/time/?hl=en","https://twitter.com/time","https://www.pinterest.com/timemagazine"]}},{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"/section/science/","name":"Science"}},{"@type":"ListItem","position":2,"item":{"@id":"https://time.com/5107838/asteroid-2002-aj129-fly-pass-earth-space-rock/","name":"An Asteroid Bigger Than the World's Tallest Building Will Fly by Earth Next Month"}}]}] ```