S/2025 U 1
S/2025 U 1 is a small moon of Uranus, with an estimated diameter between 8 and 10 kilometres (5 and 6 miles).[2] It was the 29th moon identified in the Uranus system. The discovery was announced in August 2025 by a team of astronomers led by Maryame El Moutamid,[a] who found the moon in James Webb Space Telescope NIRCam images taken on 2 February 2025.[1][b] The moon orbits about 56,250 km (34,950 mi) from the center of Uranus (between the orbits of Ophelia and Bianca) with an orbital period of 9.6 hours (0.402 days).[1] Like the other inner moons of Uranus, it follows a nearly circular orbit along Uranus's equatorial plane.[1] Due to its small size, it appears extremely faint with a near-infrared (H-band) apparent magnitude of 25.5—too faint to be seen by the Hubble Space Telescope and the Voyager 2 spacecraft.[1] NameS/2025 U 1 is the provisional designation of this unnamed moon.[3] By convention, the moons of Uranus are named after characters from the plays of William Shakespeare and Alexander Pope.[2] A proper name will be given once it is approved by the International Astronomical Union.[2][3] Co-discoverer Mark R. Showalter has stated in a 2025 New Scientist article that "there have been discussions [of a name for S/2025 U 1] but no shortlist as yet."[3] Orbit S/2025 U 1 is the 14th known member of Uranus's inner moons, which are small moons that orbit interior to the planet's five largest moons (Miranda, Ariel, Umbriel, Titania, and Oberon).[2] S/2025 U 1 follows a nearly circular orbit around Uranus's equatorial plane, at a distance of 56,250 km (34,950 mi) from the planet's center with an orbital period of 9.6 hours (0.402 days).[1] S/2025 U 1 is located outside the edge of Uranus's inner ring system, between the orbits of Ophelia and Bianca.[3] The nearly circular orbit of S/2025 U 1 suggests that it formed near its current location, according to El Moutamid.[2] Notes
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