astronomy

Uranus XXVIII

Uranus XXVIII is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Uranus XXVIII rather than just read about it. In short: Uranus XXVIII (previously known as S/2025 U 1) is a small moon of Uranus, with an estimated diameter between 8 and 10 kilometres (5 and 6 miles). It was the 29th moon identified in the Uranian system.

Key takeaways

Uranus XXVIII belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Uranus XXVIII to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Uranus XXVIII from memory before moving on to harder problems.

Reference excerpt

Uranus XXVIII (previously known as S/2025 U 1) is a small moon of Uranus, with an estimated diameter between 8 and 10 kilometres (5 and 6 miles). It was the 29th moon identified in the Uranian system. The discovery was announced in August 2025 by a team of astronomers led by Maryame El Moutamid, who found the moon in James Webb Space Telescope NIRCam images taken on 2 February 2025. The moon orbits about 57,844 km (35,943 mi) from the center of Uranus (between the orbits of Ophelia and Bianca) with an orbital period of 9.6 hours (0.402 days). Like the other inner moons of Uranus, it follows a nearly circular orbit along Uranus's equatorial plane. 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.

Name Uranus XXVIII (or Uranus 28) is the permanent Roman numeral designation of this unnamed moon, given by the International Astronomical Union (IAU) Minor Planet Center on 24 March 2026. Previously, it was known as S/2025 U 1, the temporary provisional designation given when it was announced. By convention, the moons of Uranus are named after characters from the plays of William Shakespeare and Alexander Pope. A proper name will be given once it is approved by the IAU. Co-discoverer Mark R. Showalter has stated in a 2025 New Scientist article that "there have been discussions [of a name for the moon] but no shortlist as yet."

Orbit

Uranus XXVIII 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). Uranus XXVIII follows a nearly circular orbit around Uranus's equatorial plane, at a distance of 57,844 km (35,943 mi) from the planet's center with an orbital period of 9.6 hours (0.402 days). Uranus XXVIII is located outside the edge of Uranus's inner ring system, between the orbits of Ophelia and Bianca. The nearly circular orbit of Uranus XXVIII suggests that it formed near its current location, according to El Moutamid.

Notes

References

External links James Webb Space Telescope (JWST) (19 August 2025). "New Moon Discovered Orbiting Uranus Using NASA's Webb Telescope (video)". YouTube. El Moutamid, Maryame; et al. (10 September 2025). New JWST Discoveries on the Uranian System. EPSC-DPS Joint Meeting 2025. Vol. 18. Finlandia Hall, Helsinki, Finland. doi:10.5194/epsc-dps2025-421. EPSC-DPS2025-421. El Moutamid, Maryame; et al. (12 December 2024). "JWST Proposal 6379 – Structure and Dynamics of The Rings and Inner Moons of Uranus". Space Telescope Science Institute. Cycle 3.

Illustrations

Worked examples

Example 1 — a first encounter with Uranus XXVIII

Start with the simplest possible case. Write down what Uranus XXVIII claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Uranus XXVIII before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Uranus XXVIII ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Uranus XXVIII

In research: Uranus XXVIII appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Uranus XXVIII in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Uranus XXVIII is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 2025, Discoveries by the James Webb Space Telescope, Moons of Uranus, so understanding it makes those chapters shorter.
In everyday life: Look for Uranus XXVIII outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Uranus XXVIII in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Uranus XXVIII means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Uranus XXVIII out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Uranus XXVIII in simple terms?

Why does Uranus XXVIII matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Uranus XXVIII?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Uranus XXVIII.