Perihelion Archives

Interstellar comet 3I/ATLAS just made its closest pass of the sun. Discover where it’s going next - CNN

Interstellar Comet 3I/ATLAS Completes Sun Pass, Begins Decades-Long Journey Out of Solar System

Interstellar comet 3I/ATLAS (C/2019 Q4) completed its perihelion passage and is now on a hyperbolic path out of the solar system. Learn about its trajectory and scientific significance.

3I/ATLAS Rapidly Brightens and Gets Bluer than the Sun Near Perihelion - Avi Loeb – Medium

Interstellar Object 3I/ATLAS Rapidly Brightens and Turns ‘Bluer than the Sun’ Near Perihelion

New data shows interstellar object 3I/ATLAS rapidly brightened and became ‘bluer than the Sun’ near perihelion, confirming its cometary nature. Read the full analysis.

Interstellar Comet 3I/ATLAS Reaches Perihelion, Observed by Solar Fleet

Interstellar Comet 3I/ATLAS reaches perihelion October 30, 2025. Learn why only SOHO, STEREO, and Parker Solar Probe can observe this rare event.

The Acid Test of 3I/ATLAS at Perihelion - Avi Loeb – Medium

Interstellar Object 3I/ATLAS Faces Solar ‘Acid Test’ at Perihelion in October 2025

Interstellar object 3I/ATLAS reaches perihelion on October 29, 2025, passing closer than Mercury. Read why this is the ‘acid test’ for its composition.