3I/ATLAS will not come especially close to Earth: its minimum distance is about 1.8 astronomical units, roughly 270 million kilometers (about 170 million miles), so there is no impact risk or near‑miss scenario for our planet.

How close will 3I/ATLAS get?

  • The closest approach to Earth is about 1.8 au, which is nearly twice the average Earth–Sun distance.
  • In more familiar terms, that is roughly 270 million km (about 170 million miles) away from Earth.
  • Space agencies state clearly that 3I/ATLAS poses no danger and will remain a distant object throughout its passage through the inner solar system.

When does that closest approach happen?

  • The closest approach to Earth occurs around 19 December 2025, when the comet is already beyond Earth’s orbit and heading back out of the solar system.
  • By that time, it is inside the asteroid belt region but still far outside anything that would count as “near‑Earth” in hazard terms.

Orbit context in simple terms

  • 3I/ATLAS follows a hyperbolic, unbound orbit, meaning it is just passing through the solar system once and then leaving, rather than looping around the Sun like typical comets.
  • Its closest pass is actually more “comfortable distance” than many main‑belt asteroids; Earth will not be anywhere near a collision path with it.

TL;DR: 3I/ATLAS stays about 1.8 au away—hundreds of millions of kilometers—so it will not come close to Earth in any hazardous sense.

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