Overview

• An international team led by Southwest Research Institute identified the satellite using ten long exposures taken on February 2, 2025.
• The provisional moon, designated S/2025 U1, measures about 10 kilometers across and is the smallest known inner moon of Uranus.
• It follows an almost circular path in the planet’s equatorial plane roughly 56,000 kilometers from Uranus, between the orbits of Ophelia and Bianca.
• The object was too small and faint for Voyager 2, Hubble, and prior ground‑based searches, underscoring JWST’s sensitivity for solar‑system targets.
• The find refines understanding of how Uranus’s rings and small inner moons interact, with researchers noting the system may hold further unresolved complexity.