Overview

• The object, designated S/2025 U1, was detected in ten 40‑minute NIRCam exposures taken on February 2, 2025.
• Preliminary analysis places it roughly 56,000 to 56,250 kilometers from Uranus' center on a near‑circular, equatorial path between Ophelia and Bianca.
• Researchers estimate a diameter near 10 kilometers, consistent with a very small, faint inner satellite.
• Voyager 2 and the Hubble Space Telescope did not see this object, highlighting Webb’s sensitivity and the likely complexity of Uranus’ ring–moon region.
• Its status remains provisional pending follow‑up observations and IAU procedures; if confirmed, Uranus’ known moon tally would rise to 29, including another candidate, S/2023 U1.