3I/ATLAS

3I/ATLAS — interstellar comet, explore its interactive 3D model in Cosmoscope.

Explore 3I/ATLAS in a live 3D Solar System. Follow its calculated motion and inspect real astronomical data, distances and orbital facts.

The third interstellar object ever found, and the fastest: a comet from another star system that swept through the inner solar system in late 2025 before heading back out into interstellar space.

Discovered

1 Jul 2025 — ATLAS, Río Hurtado, Chile

Perihelion

29 Oct 2025, 1.36 AU — just inside Mars’s orbit

Speed

~57 km/s relative to the Sun, far from it — the fastest yet

Nucleus

At most 5.6 km across (Hubble); drawn at an illustrative 2 km

Trajectory

Open hyperbola (e = 6.14) — JPL SBDB, two-body

Explore 3I/ATLAS in 3D

Cosmoscope places 3I/ATLAS in the Solar System using astronomical ephemeris or orbital elements, updated for the simulation time. Explore its calculated motion, distance and orbital facts in the interactive 3D view. Accuracy depends on the orbital model and its valid time range.