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On April 13, 2029, a 1,110-foot-wide asteroid known as 99942 Apophis will speed past our planet at an estimated distance of around 19,000 miles, potentially coming closer to the surface than some orbiting spacecraft. Despite being a decade away, this future close encounter is causing quite a stir within the asteroid research community. So much so that it is the focus of a session Tuesday at the 2019 Planetary Defense Conference in College Park, Maryland, during which scientists will discuss everything from potential observation strategies to hypothetical missions that could explore the object itself. On the day of the close...

Near-Earth Asteroid 2004 MN4 Don Yeomans, Steve Chesley and Paul Chodas NASA's Near Earth Object Program Office December 24, 2004 2004 MN4 is now being tracked very carefully by many astronmers around the world, and we continue to update our risk analysis (http://neo.jpl.nasa.gov/risk) for this object. Today's impact monitoring results indicate that the impact probability for April 13, 2029 has risen to about 1.6%, which for an object of this size corresponds to a rating of 4 on the ten-point Torino Scale. Nevertheless, the odds against impact are still high, about 60 to 1, meaning that there is a better...