when is 3i atlas closest to earth

3I/ATLAS is closest to Earth on 19 December 2025 , at a distance of about 270 million km (around 1.8 AU) , and it will not come any closer than this during its passage through the solar system.

Key details

• Closest-approach date: 19 December 2025.

• Distance at closest approach: About 270 million km from Earth, which is roughly 1.8 times the Earth–Sun distance.

• Safety: At that distance, impact risk is effectively zero; it is a distant flyby, not a near‑Earth event.

Viewing chances

• Around closest approach, its brightness is estimated near magnitude ~10–11, meaning binoculars or a small telescope are needed; it will not be a naked‑eye spectacle.

• Best viewing details (exact sky position and timing from your location) are provided by major observatories and NASA/JPL interactive tools, which update as new measurements refine the orbit.

Context and “latest news”

• 3I/ATLAS is an interstellar comet , only the third known interstellar object after ‘Oumuamua and 2I/Borisov, so its 2025 flyby has been a trending topic in astronomy news and forums.

• After the December 19 closest pass, it heads back out through the outer solar system (past Jupiter in early 2026) and will then leave the heliosphere, not returning again.

Information gathered from public forums or data available on the internet and portrayed here.