NASA will conduct the world's first mission to test technology for defending Earth against potential asteroid or comet hazards.
The agency's Double Asteroid Redirection Test, or DART, will impact the asteroid Dimorphos at 7:14 p.m. ET on Sept. 26.
The asteroid poses no threat to Earth.
DART will provide data to help Earth better prepare for an asteroid that could pose an impact hazard to Earth.
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Dimorphos is the smaller moonlet asteroid of the binary asteroid system Didymos, according to the Johns Hopkins University Applied Physics Laboratory, which is developing and leading the mission for NASA.
It has a diameter of 525 feet and orbits the larger asteroid Didymos.
The DART spacecraft will impact Dimorphos almost head-on. The collision will shorten the time it takes the small asteroid moonlet to orbit Didymos by several minutes.
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The timing of the impact was chosen to be when the distance between Earth and Didymos is minimized, to enable "the highest quality telescopic observations."
However, Didymos will still be approximately 11 million kilometers (about 6.8 million miles) from Earth and the impulse of energy that DART delivers to Dimorphos is low.
NASA will cover the impact live on NASA TV and its social media platforms starting at 6 p.m. ET.
DART launched on a SpaceX Falcon 9 rocket from California's Vandenberg Space Force Base in November.
