What new moon, S/2025 U1, was discovered orbiting Uranus in 2025?

In 2025, astronomers announced the discovery of a new moon orbiting the ice giant Uranus, provisionally designated S/2025 U1. This designation is a standard naming convention for newly found celestial bodies, indicating it's a satellite discovered in 2025 orbiting Uranus. The groundbreaking detection was made possible by the powerful James Webb Space Telescope (Deals) (JWST), which captured images on February 2, 2025, revealing this previously unseen companion.

This tiny moon is estimated to be only about 10 kilometers (6 miles) in diameter, making it one of the smallest known moons of Uranus. Its diminutive size and faintness allowed it to elude detection by earlier missions, including the Voyager 2 spacecraft during its 1986 flyby. S/2025 U1 completes an orbit around Uranus in approximately 9.6 hours, nestled between the planet's inner moons Bianca and Ophelia. Its discovery increases the number of confirmed Uranian moons to 29, highlighting the ongoing efforts to map our solar system's intricate celestial mechanics.

The discovery of S/2025 U1 marks a significant achievement for the James Webb Space Telescope, representing its first detection of a moon orbiting a planet within our own solar system. While "S/2025 U1" serves as its temporary identifier, the moon will eventually receive a formal name, following the tradition of naming Uranian satellites after characters from the works of William Shakespeare or Alexander Pope. This recent find underscores the incredible capabilities of modern astronomical instruments and the enduring mysteries that still await discovery even in our cosmic backyard.