3 papers
astro-ph.EP2025
Covertly Active Comet (139359) 2001 ME1
Qicheng Zhang, Quanzhi Ye, Karl Battams +3
On 2018 November 18, coronagraphs onboard the Solar and Heliospheric Observatory (SOHO) captured an unrecognized comet crossing its fields of view. We identified this comet to be t…
astro-ph.EP2025
Rapid Brightening of 3I/ATLAS Ahead of Perihelion
Qicheng Zhang, Karl Battams
Interstellar comet 3I/ATLAS has been approaching its 2025 October 29 perihelion while opposite the Sun from Earth, hindering ground-based optical observations over the preceding mo…
astro-ph.EP2025
Discovery and Preliminary Characterization of a Third Interstellar Object: 3I/ATLAS
Darryl Z. Seligman, Marco Micheli, Davide Farnocchia +44
We report initial observations aimed at the characterization of a third interstellar object. This object, 3I/ATLAS or C/2025 N1 (ATLAS), was discovered on 2025 July 1 UT and has an…