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New moon found orbiting Uranus is its smallest one

August 20, 2025
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New moon found orbiting Uranus is its smallest one
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Astronomers have discovered a brand new moon nested among the many 28 others close to Uranus

NASA, ESA, CSA, STScI, M. El Mou

A small and dim moon has been found in orbit round Uranus, bringing the planet’s whole to 29. Lots of the ice big’s different moons are named after characters from works by William Shakespeare, and scientists are actually debating which of his characters might lend the physique its title.

The brand new moon was found by a workforce led by Maryame El Moutamid at Southwest Analysis Institute in Colorado, utilizing 10 long-exposure infrared pictures taken by NASA’s James Webb House Telescope (JWST) on 2 February this 12 months.

The moon presently has the provisional title S/2025 U 1. However in time it is going to most likely be named alongside the identical traces as 27 of Uranus’ moons: taking a personality’s title from one in every of Shakespeare’s performs. This conference dates again to the invention of the planet’s first two moons, Titania and Oberon, in 1787.

The chosen title for the newly-found moon will must be accepted by the Worldwide Astronomical Union (IAU), the main authority on assigning official names and designations to astronomical objects. Mark Showalter on the SETI Institute, who was a part of the analysis workforce and is a self-confessed theatre fan, says there have been discussions however no shortlist but.

Showalter says recognizing a moon so small and dim was a tough process. “It’s a tiny object proper subsequent to a really, very brilliant object. It’s like staring into the headlight of a automotive and making an attempt to have a look at a fly,” he says. “The James Webb telescope is a unprecedented instrument that’s vastly extra delicate than every other telescope that has ever existed, frankly.”

There may be hope extra moons could also be discovered round Uranus, says Showalter. “We definitely haven’t completed the job,” he says. “I feel it’s cheap to imagine that there are extra satellites on the market. We at all times suspected that there may be some satellites inside the ring system which can be sort of what we name shepherding moons, that push the ring materials round. We haven’t discovered any of these but, however that’s a serious focus for our ongoing work.”

El Moutamid says the sharpness of Uranus’ rings point out there are more likely to be extra moons, but undiscovered, that helped with the rings’ formation. “There are most likely numerous extra on the market which can be simply ready for us to detect them,” she says. A few of these could also be discovered by JWST, however there could possibly be a rash found by the proposed Uranus Orbiter and Probe mission in 2044 if it goes forward as deliberate. “In all probability there are many moons on the market which can be very tiny, and we simply can’t detect them but due to the decision that we’ve thus far,” she says.

S/2025 U 1 is estimated to be round 10 kilometres in diameter, that means it’s too small to have been seen by the cameras aboard the Voyager 2 probe. Voyager 2 launched in 1977 and handed by Uranus in 1986, coming as shut as 81,500 kilometres. It stays the closest move to Uranus by a spacecraft from Earth.

The brand new moon is on the fringe of Uranus’ interior rings, situated round 56,250 kilometres from its centre within the planet’s equatorial airplane. This locations it between the orbits of the moons Ophelia and Bianca.

NASA operates a “Normal Observer” program for JWST, which permits any scientist around the globe to suggest targets that require one of many telescope’s superior sensors. El Moutamid utilized for time on JWST’s NIRCam instrument – a excessive decision infrared sensor – to review the rings of Uranus. That software led to the invention of this new little moon.

Matters:

  • moons/
  • James Webb house telescope



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