astronomy

LTT 9779

LTT 9779 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 LTT 9779 rather than just read about it. In short: LTT 9779, also named Uúba, is a G-type main-sequence star located 264 light-years (81 parsecs) away from the Solar System in the constellation of Sculptor. The star is about 95% the radius and about the same mass as the Sun, but younger than the Sun at 1.7 billion years old, hence its lower luminosity (about 0.7 L☉).

Key takeaways

LTT 9779 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect LTT 9779 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of LTT 9779 from memory before moving on to harder problems.

Reference excerpt

LTT 9779, also named Uúba, is a G-type main-sequence star located 264 light-years (81 parsecs) away from the Solar System in the constellation of Sculptor. The star is about 95% the radius and about the same mass as the Sun, but younger than the Sun at 1.7 billion years old, hence its lower luminosity (about 0.7 L☉). It has a temperature of 5,443 K (5,170 °C; 9,338 °F) and a rotation period of 45 days. LTT 9779 is orbited by one known exoplanet, LTT 9779 b.

Nomenclature The designation LTT 9779 comes from one of Luyten's catalogues of stars with high proper motion. In August 2022, this planetary system was included among 20 systems to be named by the third NameExoWorlds project. The approved names, proposed by a team from Colombia, were announced in June 2023. LTT 9779 is named Uúba and its planet is named Cuancoá, after the U'wa language word referring to "stars", "seeds", or "eyes" and the name for the morning star, respectively.

Planetary system The discovery of the exoplanet LTT 9779 b using TESS was published in 2020. It is an ultra-hot Neptune with about 29 times the mass and 4.7 times the radius of Earth and an orbital period of less than a day. These parameters make it one of the very few known planets in the Neptunian desert. Observations using the Spitzer Space Telescope have measured the planet's dayside temperature at 2,305 K (2,032 °C; 3,689 °F), and observations by CHEOPS have shown the planet to be highly reflective, with an albedo of 80%. A study published in 2019, prior to the confirmation of LTT 9779 b, proposed a second candidate planet in the system based on transit timing variations, but this has not been confirmed, and the study that confirmed LTT 9779 b found no evidence of transit timing variations.

Worked examples

Example 1 — a first encounter with LTT 9779

Start with the simplest possible case. Write down what LTT 9779 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 LTT 9779 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 LTT 9779 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 LTT 9779

In research: LTT 9779 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 LTT 9779 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: LTT 9779 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Durchmusterung objects, G-type main-sequence stars, Hipparcos objects, so understanding it makes those chapters shorter.
In everyday life: Look for LTT 9779 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 LTT 9779 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what LTT 9779 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 LTT 9779 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is LTT 9779 in simple terms?

Why does LTT 9779 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 LTT 9779?

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 LTT 9779.