Tootfinder

The #interstellar #comet #ATLAS with a 2-meter telescope, from the AT "Deep g'-band Imaging of Interstellar Comet 3I/ATLAS from the Two-meter Twin Telescope (TTT)" https://www.astronomerstelegram.org/?read=17264 - other observations were reported in https://www.astronomerstelegram.org/?read=17263 ("Interstellar Interloper C/2025 N1 is Active"), and there are a short JPL video at https://www.youtube.com/watch?v=-vzafaw0t08 and ESA and NASA press releases in https://www.esa.int/Space_Safety/Planetary_Defence/ESA_tracks_rare_interstellar_comet and https://science.nasa.gov/blogs/planetary-defense/2025/07/02/nasa-discovers-interstellar-comet-moving-through-solar-system/

There is now also a CBET about the new interstellar #comet 3I/ATLAS: http://www.cbat.eps.harvard.edu/iau/cbet/005500/CBET005578.txt - it comes with an even more precise orbit based on astrometry back to 5 June and predicts 13th magnitude with 60° elongation after perihelion in November. The current magnitude is about 17.7.

The third #interstellar object - formerly known as #A11pl3Z - has just been named 3I/ATLAS: #comet after all!

The 43rd issue of The #Comet's Tale from the BAA is full of interesting articles: https://britastro.org/wp-content/uploads/2015/11/tail43.pdf (in https://britastro.org/section_information_/comet-section-overview/the-comets-tale all issues).

The First Detection of Molecular Activity in the Largest Known Oort Cloud Comet - ALMA Imaging of C/2014 UN271 (Bernardinelli–Bernstein) at 16.6 au from the Sun: #Comet Ever Observed Reveals Its Secrets with ALMA’s Powerful Gaze: https://public.nrao.edu/news/largest-oort-cloud-comet-ever-observed-reveals-its-secrets-with-almas-powerful-gaze/ - giant comet’s molecular activity and chemistry detected at record distance.