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JWST Data Rules Out 2032 Lunar Impact by Asteroid 2024 YR4

Ultra‑faint James Webb detections enabled a precise orbit update that eliminated the Moon‑impact concern.

Overview

  • NIRCam observations on Feb. 18 and 26, 2026 extended the asteroid’s track and resolved earlier estimates that had assigned small impact probabilities for 2032.
  • NASA’s Center for Near‑Earth Object Studies now projects a Dec. 22, 2032 flyby about 21,200 kilometers above the lunar surface.
  • Independent analyses of the same data estimate a safe pass at roughly 22,900 kilometers from the Moon.
  • ESA’s Planetary Defence program stated the risk is eliminated and noted routine detection and tracking will continue.
  • To capture the extremely faint, fast‑moving object—likened to the light from an almond at lunar distance—the team adapted JWST’s NIRCam for precision tracking, led by Andy Rivkin and Julien de Wit.