Mikko Pöntinen's detection software flagged the streak (https://www.skyatnightmagazine.com/news/comet-c-2026-s1-euclid) across five Euclid Deep Field North image sets. The new comet sits about 808 million miles out, on an orbit running almost perpendicular to the planets.
Source: https://www.skyatnightmagazine.com/news/comet-c-2026-s1-euclid
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