Interstellar comet 3I/ATLAS made its closest approach to Earth early on Friday, Dec. 19. While it didn't come close enough to pose any risk to our planet, astronomers have calculated the precise moment when the comet reached its minimum distance to us.
According to the orbital calculations from NASA's Jet Propulsion Laboratory (JPL) Horizons system, comet 3I/ATLAS was closest to Earth at 1 a.m. EST (0600 GMT) on Dec. 19. At that time, the comet was about 1.8 astronomical units away — roughly 168 million miles (270 million kilometers — or nearly twice the average distance between Earth and the sun.
