Overview

• The team led by Maryame El Moutamid identified S/2025 U1 in ten JWST NIRCam exposures taken on February 2, 2025, over nearly seven hours.
• S/2025 U1 is estimated to be about 10 kilometers across and extremely faint, which helps explain why Voyager 2 and Hubble did not detect it.
• The object orbits roughly 56,000–56,250 kilometers from Uranus between Ophelia and Bianca, just outside the planet’s narrow inner rings.
• Its path appears nearly circular, a clue to long-term stability or in‑situ formation, with further observations planned to refine its size and orbit.
• The discovery brings Uranus’ identified moon tally to 29, while the new satellite keeps its provisional designation pending an IAU-approved name.