NASA has approved the Near-Earth Object Surveyor space telescope to move to the next phase of mission development after a successful mission review, authorizing the mission to move forward into Preliminary Design. The infrared space telescope is designed to help advance NASA’s planetary defence efforts by expediting our ability to discover and characterize most of the potentially hazardous asteroids and comets that come within 30 million miles of Earth’s orbit, collectively known as near-earth objects, or NEOs.

Following completion of the goal to discover 90% of all NEOs larger than 1,000 meters (3,280 feet) in size in 2010, the National Aeronautics and Space Administration Act of 2005 (Public Law 109-155) directed NASA to discover 90% of NEOs larger than 140 meters (459 feet) in size. The agency is diligently working to achieve this directive and has currently found approximately 40% of near-Earth asteroids within this size range. Kelly Fast, program manager for NASA’s NEO Observations Program, commented:

“Each night, astronomers across the globe diligently use ground-based optical telescopes to discover new NEOs, characterize their shape and size, and confirm they do not pose a threat to us. Those telescopes are only able to look for NEOs in the night sky. NEO Surveyor would allow observations to continue day and night, specifically targeting regions where NEOs that could pose a hazard might be found and accelerate the progress toward the Congressional goal.”

Discovering, characterizing, and tracking potentially hazardous NEOs as early as possible is crucial in ensuring that deflection or other preparations for impact mitigation can be carried out in time. NASA will test one deflection technology with its Double Asteroid Redirection Test (DART) mission, to be launched later this year. While there are no known impact threats to Earth for the next century, unpredicted impacts by unknown NEOs – such as the 2013 Chelyabinsk event in Russia – still pose a hazard to Earth. Amy Mainzer, principal investigator for NEO Surveyor at the University of Arizona noted:

“By searching for NEOs closer to the direction of the Sun, NEO Surveyor would help astronomers discover impact hazards that could approach Earth from the daytime sky. NEO Surveyor would also significantly enhance NASA’s ability to determine the specific sizes and characteristics of newly discovered NEOs by using infrared light, complementing ongoing observations being conducted by ground-based observatories and radar.”

NEO Surveyor’s approval to move to this next mission milestone brings the telescope one step closer to launch, which is currently scheduled for the first half of 2026. The mission is being developed by NASA’s Jet Propulsion Laboratory in Southern California and managed by NASA’s Planetary Missions Program Office at Marshall Space Flight Center, with program oversight by the Planetary Defense Coordination Office (PDCO). NASA established the PDCO in 2016 to manage the agency’s ongoing efforts in Planetary Defense.

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