Extreme Negative Polarisation of New Interstellar Comet 3I/ATLAS

Zuri Gray, Stefano Bagnulo, Galin Borisov +13

We present the first polarimetric observations of the third discovered interstellar object, 3I/ATLAS (C/2025 N1), obtained pre-perihelion with FORS2/VLT, ALFOSC/NOT, and FoReRo2/RC…