Currently traveling through our solar system at about 60 km/s (roughly 37 miles per second), 3I/ATLAS is around 420 million miles (≈4.5 AU) from the Sun and is approaching from the direction of Sagittarius on a hyperbolic path—an unambiguous indicator that it comes from beyond our solar system .
Early observations suggest the object behaves like a comet, sporting a subtle coma and short dust tail. Because of this, it's been reclassified from asteroid-like to Comet C/2025 N1 . While some initial brightness-based estimates placed its diameter at up to 20 km, scientists now believe its nucleus is much smaller—possibly only a few kilometers wide—since much of its brightness comes from the surrounding coma .
NASA has reassured the public that this comet poses no threat to Earth—it’ll never come closer than 1.6 AU (about 150 million miles) . Its closest approach to the Sun, or perihelion, is expected around October 29–30, 2025, at approximately 1.38 AU, just inside Mars’s orbit .
The comet is expected to brighten as it draws nearer to the Sun, and it should be visible through telescopes for amateur astronomers from late 2025 into early 2026 . For those eager to see it sooner, the Virtual Telescope Project will stream live views starting July 3, 2025, around 22:00 UTC .
In summary:
Name: 3I/ATLAS (C/2025 N1)
First detected: July 1 2025, with pre-discovery images from June 14
Speed: ~60 km/s (37 mi/s)
Current distance: ~4.5 AU (≈420 million miles) from the Sun
Orbit: Hyperbolic — proven interstellar origin
Cometary features: Faint coma & tail; reclassified as a comet
Perihelion date: ~Oct 29–30, 2025, at ~1.38 AU
Earth safety: No hazard — stays at least 1.6 AU away
Observation window: Visible via telescope late 2025–early 2026, and live streams from July 3
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