3 papers
astro-ph.EP2026
JWST Observations of Asteroid 2024 YR4 Rule Out a 2032 Lunar Impact and Demonstrate a New Regime for Planetary Defense Follow-up
Julien de Wit, Andrew S. Rivkin, Marco Micheli +12
At the end of its discovery apparition, the 60 m near-Earth object 2024 YR4 was associated with a non-zero probability of lunar impact during its 2032 December 22 close appro…
astro-ph.EP2025
Mercury's Crustal Magnetization Indicates a Stronger Ancient Dynamo
Isaac S. Narrett, Benjamin P. Weiss, Sarah C. Steele +1
Mercury is the only terrestrial planet in the solar system other than Earth with an active dynamo magnetic field (~200 nT at the equatorial surface). Furthermore, Mercury's ~3.9-3.…
astro-ph.EP2025
Impact Plasma Amplification of the Ancient Mercury Magnetic Field
Isaac S. Narrett, Rona Oran, Yuxi Chen +4
Spacecraft measurements of Mercury indicate it has a core dynamo with a surface field of 200-800 nT. These data also indicate that the crust contains remanent magnetization likely…