astronomy

WASP-69

WASP-69 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 WASP-69 rather than just read about it. In short: WASP-69, also named Wouri, is a K-type main-sequence star 164 light-years (50 parsecs) away from Earth in the constellation Aquarius. Its surface temperature is 4782±15 K.

Key takeaways

WASP-69 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect WASP-69 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of WASP-69 from memory before moving on to harder problems.

Reference excerpt

WASP-69, also named Wouri, is a K-type main-sequence star 164 light-years (50 parsecs) away from Earth in the constellation Aquarius. Its surface temperature is 4782±15 K. WASP-69 is slightly enriched in heavy elements compared to the Sun, with a metallicity Fe/H index of 0.10±0.01, and is much younger than the Sun at 2 billion years. The data regarding starspot activity of WASP-69 are inconclusive, but spot coverage of the photosphere may be very high. Multiplicity surveys did not detect any stellar companions to WASP-69 as of 2020.

Nomenclature The designation WASP-69 indicates that this was the 69th star found to have a planet by the Wide Angle Search for Planets. 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 Cameroon, were announced in June 2023. WASP-69 is named Wouri and its planet is named Makombé, after the Wouri and Makombé rivers in Cameroon.

Planetary system In 2013, one planet, named WASP-69b, was discovered on a tight, circular orbit. Its equilibrium temperature is 886 K, but the measured terminator temperature is significantly higher by at least 200 K. The planet is losing mass at a moderate rate of 0.5 M🜨 per billion years, producing a tail detected in 2024 and measured to be at least 7 times its own radius. The planetary atmosphere is extremely hazy and contains a partial cloud deck with cloud tops rising to a pressure of 100 Pa. Its composition is mostly hydrogen and helium, and sodium was also detected in low concentration. The sodium may originate from volcanic moons, not from the planet itself. By 2021, the presence of hazes in atmosphere of WASP-69b was confirmed, along with a solar or super-solar water abundance.

References

Worked examples

Example 1 — a first encounter with WASP-69

Start with the simplest possible case. Write down what WASP-69 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 WASP-69 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 WASP-69 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 WASP-69

In research: WASP-69 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 WASP-69 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: WASP-69 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Aquarius (constellation), Durchmusterung objects, K-type main-sequence stars, so understanding it makes those chapters shorter.
In everyday life: Look for WASP-69 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 WASP-69 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what WASP-69 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 WASP-69 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is WASP-69 in simple terms?

WASP-69, also named Wouri, is a K-type main-sequence star 164 light-years (50 parsecs) away from Earth in the constellation Aquarius. Its surface temperature is 4782±15 K.

Why does WASP-69 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 WASP-69?

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 WASP-69.