Rapid-response characterization of near-Earth asteroid 2024 YR4 during a Torino Scale 3 alert

Maxime Devogèle, Olivier R. Hainaut, Marco Micheli +32

On 27 December 2024, near-Earth object (NEO) 2024 YR${}_4$ was discovered by the ATLAS survey and identified as a virtual impactor. A few weeks later, it eventually reached level 3 o…