The Apophis Encounter in 2029: A Rare Opportunity for Planetary Science and Planetary Defense

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Abstract
The 2029 close encounter of near-Earth asteroid (99942) Apophis, at approximately 38,000 km from Earth center, offers a unique opportunity to advance planetary science, defense, and public engagement. This rare event enables real-time observations of tidal effects, surface displacement, spin changes, and dust ejection, deepening our understanding of rubble-pile asteroids and improving models of their evolution. Detailed data will refine predictions of the Yarkovsky and YORP effects, enhancing asteroid dynamics research. From a planetary defense perspective, Apophis provides a critical test case for impact risk assessment and mitigation strategies, informing rapid-response reconnaissance missions. Public outreach during the event will raise awareness of asteroid science and planetary safety, fostering interest in space exploration. International collaborations, including NASA’s OSIRIS-APEX and ESA’s RAMSES missions, along with the potential contributions from China, aim to maximize scientific returns, making the 2029 Apophis flyby a milestone in global planetary exploration and defense efforts.
Funding Information
  • National Natural Science Foundation of China (12233003)

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