With NASA's Eyes on the Solar System interactive app.

 With NASA's Eyes on the Solar System interactive app, you can follow comet 3I/ATLAS as it travels through our solar system and see where it's headed next.

https://eyes.nasa.gov/apps/solar-system/#/c_2025_n1

Discovered on July 1, 2025, Comet 3I/ATLAS is the third known object from outside our solar system to be discovered passing through our celestial neighborhood. Astronomers have categorized this object as interstellar because of the hyperbolic shape of its orbital path (it does not follow a closed orbital path about the Sun.)

Comet 3I/ATLAS poses no threat to Earth, approaching no closer than about 1.8 astronomical units (about 170 million miles, or 270 million kilometers). The comet reaches its closest point to the Sun around October 30th, 2025, at a distance of about 1.4 AU (130 million miles, or 210 million kilometers) — just inside the orbit of Mars. The size and physical properties of 3I/ATLAS are being investigated by astronomers around the world, and by various robotic spacecraft. Observations as of August 2025 indicate its nucleus is not larger than 3.5 miles (5.6 kilometers) in diameter.