Comet C/2026 S1 (Euclid) observations in context

Comet C/2026 S1 (Euclid) seen in a wide VIS image for context (left), with a zoom in (right).

The image was captured on 20 September 2026, during the Euclid Deep Field North survey. It is a 560.52 second exposure, so the comet appears like a streak because it moves across the sky during the long exposure. A fuzzy cloud of dust and gas, known as a ‘coma’ in cometary terms, is seen around the object.

Comet C/2026 S1 (Euclid) is the first previously unknown comet to be discovered by ESA’s Euclid space telescope.

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[Image description: A black-and-white Euclid image shows a sky field filled with bright points and faint fuzzy light sources on a dark background. A boxed region is enlarged in an inset, where comet C/2026 S1 (Euclid) is marked by an arrow. The comet appears as a bright elongated streak surrounded by a diffuse cloud of light. Lines connect the inset to the comet’s location in the wider image.]