Tootfinder

Strong recommendation to watch the first 25 minutes of #InterstellarComet in public images from #Perseverance on #Mars - including a detailled discussion of all processing steps necessary to finally arrive at the stacked image https://x.com/astroferg/status/1974898186113438080

And here now is the color composite of the famous images of the #InterstellarComet 3I/ATLAS taken in the night 27/28 August in u, g, r and i: https://noirlab.edu/public/news/noirlab2525/ - the tail measures about 30 arc seconds. Amateur astronomers caught it as well, with a 12-inch telescope, only a few hours later: https://groups.io/g/comets-ml/message/33921

Images of the #InterstellarComet 3I/ATLAS taken in u, g, r, and i bands on 2025 August 27 UTC with GMOS on Gemini South during the "Shadow the Scientists" event - see https://www.astronomerstelegram.org/?read=17363 for what's seen here.

Here now is an edited recording of the "Shadow the Scientists" event last night during which Gemini South observed the #InterstellarComet 3I/ATLAS and detected its antisolar tail which hadn't been seen before: https://www.youtube.com/watch?v=5__AG5M5X8M - happens at 1:14:00.

Whoa, the #InterstellarComet 3I/ATLAS clearly has a tail now! A raw image taken minutes ago with the GMOS instrument on Gemini South and shared live during the Shadow the Scientists event - I raised the contrast slightly.

A Close Encounter with an Interstellar Visitor from Gemini South - the "Shadow the Scientists" webinar series goes after #InterstellarComet ATLAS in 1/2 hour: https://shadow.ucsc.edu/2022/03/04/upcoming-sessions/ (scroll down) -> https://ucsc.zoom.us/meeting/register/HOA3YS2iTwyKZl2gmn92dQ#/registration (Zoom registration link).

The Detection of CN in #InterstellarComet 3I/ATLAS / FAN-SHAPED DUST EMISSION FROM THE NUCLEUS OF COMET 3i: https://www.astronomerstelegram.org/?read=17352 / https://www.astronomerstelegram.org/?read=17350. Comet C/2025 K1 (ATLAS) is deeply depleted of C2: https://www.astronomerstelegram.org/?read=17351

SPHEREx Discovery of Strong Water Ice Absorption and an Extended Carbon Dioxide Coma in 3I/ATLAS: #InterstellarComet 3I-ATLAS: https://spherex.caltech.edu/news/3i-atlas-co2-coma