Space Mission Options for Reconnaissance and Mitigation of Asteroid 2024 YR4

The article discusses the potential impact of the near-Earth asteroid 2024 YR4 and outlines space mission options for reconnaissance and mitigation in case of a lunar impact. The asteroid's diameter was estimated at 60 +/- 7 m, and studies suggest that lunar ejecta could pose a threat to astronauts and spacecraft in low Earth orbit. The proposed missions include flyby, rendezvous reconnaissance, deflection, and disruption of the asteroid using various propulsion methods and launch vehicles. While deflection missions seem impractical, kinetic and nuclear disruption missions are considered viable options with potential launches between 2030 and 2032. The article emphasizes the importance of deploying a reconnaissance mission to characterize the asteroid, even if a lunar impact is ruled out.