December 12, 2025 - New images taken with the Gemini North telescope in Hawaii confirm that the interstellar comet 3I/ATLAS has gotten brighter and greener since its close flyby of the sun in October.

1 week ago - 3I/ATLAS is a faint comet that does not get very close to Earth or the Sun and was not expected to get brighter than about apparent magnitude 11.5 as seen from Earth. Even at its peak brightness, the comet was not visible to an observer on Earth using the naked eye or smaller binoculars.

October 30, 2025 - New images of the interstellar object 3I/ATLAS as it approached perihelion on October 29, 2025, reveal rapid brightening and a color bluer…

December 18, 2025 - The image shows the comet’s coma ... NOIRLab) The Gemini North telescope in Chile has captured vivid new images of interstellar comet 3I/ATLAS, revealing a faint green glow as the object emerges from behind the sun....

January 2, 2026 - On the Comet Observation database ... Ever since the comet emerged from behind the Sun, in late October, it has been far brighter than originally predicted....

December 17, 2025 - Discovered over the summer, it ... coma and unusual jets. Recent telescope images show it has grown brighter and greener since passing near the Sun in late October....

November 7, 2025 - 30, and three sun-facing spacecraft collected images of the wanderer as it zoomed past our star. This imagery revealed that 3I/ATLAS underwent a " rapid brightening" that exceeds what is observed in most comets at similar distances to the sun.

November 3, 2025 - (NOAA/Lockheed Martin) The comet reached perihelion on October 29, and the team's calculations suggest it may have brightened to around magnitude 9, bright enough to be visible through smaller amateur telescopes.

April 27, 2026 - Where is 3I/ATLAS Now? By now, 3I/ATLAS is at a distance of a billion kilometers or 6.7 times the Earth-Sun separation, well beyond Jupiter. Our interstellar visitor appears as a fading dot, similar …

November 7, 2025 - The comet is a lot brighter when viewed with bluer filters than redder filters, though the bluer filters are more of a mix of green and blue, and not actually that sensitive to pure blue.

June 27, 2026 - We acknowledge with thanks the comet observations from the COBS Comet Observation Database contributed by observers worldwide and used in this table to report recent comet observations. The following table lists today's rise, transit and set times of comet 3I/ATLAS from Greenwich, UK (all times relative to the local timezone Europe/London):

November 4, 2025 - The optical observations show that 3I/ATLAS is now even brighter than when it went in.

November 4, 2025 - New observations reveal that 3I/ATLAS may be turning blue.

November 18, 2025 - Watch an Oort Cloud comet disintegrate before your eyes. Meanwhile, interstellar intruder 3I/ATLAS is brighter than expected.

February 23, 2026 - By December 2025, according to Johns Hopkins astronomer Carey Lisse, the comet was “full-on erupting,” rapidly brightening as water ice transformed from solid to gas in the vacuum of space.

December 15, 2025 - "Interstellar comet 3I/ATLAS has a post-perihelion greenish glow in time for the holidays," said Bryce Bolin, a research scientist from Eureka Scientific who led the observations, in a

December 12, 2025 - Just before 3I/ATLAS became unobservable, Unistellar data showed an unexpected surge in brightness. This brightening exceeded predictions, hinting at either a sudden outburst of gas or an increase in surface activity.

November 1, 2025 - The comet reached perihelion on October 29, and the team's calculations suggest it may have brightened to around magnitude 9, bright enough to be visible through smaller amateur telescopes.