2025-10-30 02:33:07
And here comes ... another light curve of interstellar comet #ATLAS through much of October, now based on the satellite coronagraphs LASCO C3 and CCOR-1, with observations up to and including October 26th! From the paper "Rapid Brightening of 3I/ATLAS Ahead of Perihelion" - https://arxiv.org/abs/2510.25035 - out minutes ago: it finds that "CCOR-1 also resolves the comet as an extended source with an apparent coma ~4' in diameter. Furthermore, LASCO color photometry shows the comet to be distinctly bluer than the Sun, consistent with gas emission contributing a substantial fraction of the visible brightness near perihelion."




