Comet 3I/ATLAS reaches closest point to Earth: How to see it on Friday night
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Editor’s note, Dec. 19 at 10:00 a.m. ET: Comet 3I/ATLAS officially p***ed its closest point to Earth last night and is zooming away from us for good. However, due to rainy conditions in Italy, the Virtual Telescope Project live stream was postponed until 11 p.m. EST on Friday, Dec. 19 (0400 GMT on Dec. 20). Try to catch the free webcast here tonight. You can still see the comet through a decent backyard telescope, as well.
The precise moment will come at 1 a.m. EST (0600 GMT) on Dec. 19, according to Space.com. Though still just under twice the distance from Earth as the sun — something that will preclude stunning photos from giant telescopes — it’s a unique opportunity to glimpse an object from another star system. Discovered in July 2025, it comes in the wake of 1I/’Oumuamua in 2017 and 2I/Borisov in 2019.
Comet 3I/ATLAS is now on its way away from the sun and out of the solar system, and by far the easiest way to see it before it departs will be online. Using its large telescopes in Manciano, Italy, the Virtual Telescope Project will host a free webcast on YouTube beginning at 11 p.m. EST on Dec. 18 (0400 GMT on Dec. 19). The webcast will also be available as a replay after the live event ends.
Another way to see comet 3I/ATLAS is with a GoTo or smart telescope. Any optical device with a motor can be trained on the object in the constellation Leo. The easiest method is via a smart telescope, such as the Seestar S50, Unistellar eVscope 2, Vaonis Vespera Pro or Celestron Origin; you should be able to find 3I/ATLAS in the app used to control any of these telescopes.
Any planetarium app — such as Sky Tonight, Sky Guide, Stellarium and SkySafari 7 Pro — will also have 3I/ATLAS in its database. That will be helpful to find it visually. Technically, it is visible in large astronomy binoculars, but at magnitude 11, it’s going to look “like a tiny, slightly out-of-focus star,” according to Sky at Night.
A better way to view the comet is with a medium-to-large telescope of about 12 inches, according to NASA, through which observers may spot a faint, fuzzy patch of greenish light close to the bright star Regulus in Leo and a fainter companion, called Rho Leonis.
In the meantime, astronomical telescopes on Earth and in space will continue to monitor it — some from much closer distances than we’ll get. Just today, NASA released new ultraviolet images of the comet taken with its Europa Clipper spacecraft from roughly 102 million miles (164 million km) away, closing the distance from Earth by about a third. Stay tuned for more NASA image releases after the close approach.
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