Overview

• NASA announced the discovery Tuesday of a roughly 10-kilometer object provisionally designated S/2025 U1, bringing Uranus’s known moons to 29.
• Webb’s near-infrared camera captured the faint body in February, and researchers confirmed it is co-orbiting with Uranus.
• The satellite circles about 56,000 kilometers from the planet’s center on an almost circular path, which scientists say is consistent with local formation.
• Its small size and low brightness likely kept it hidden from Voyager 2 and earlier telescopes during past observations.
• The find marks the smallest member identified in Uranus’s inner moon system, and a permanent name awaits approval by the International Astronomical Union.