astronomy

WASP-20

WASP-20 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-20 rather than just read about it. In short: WASP-20, also known as CD-24 102, is a binary star system in the equatorial constellation Cetus, located at a distance of about 940 light-years (290 parsecs) from the Sun. The primary star is an F-type main sequence star and hosts one confirmed exoplanet, WASP-20b.

Key takeaways

WASP-20 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-20 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of WASP-20 from memory before moving on to harder problems.

Reference excerpt

WASP-20, also known as CD-24 102, is a binary star system in the equatorial constellation Cetus, located at a distance of about 940 light-years (290 parsecs) from the Sun. The primary star is an F-type main sequence star and hosts one confirmed exoplanet, WASP-20b.

Stellar properties WASP-20 is a star of spectral type F9, aged 3.6 billion years. Its mass is 10.09+0.05−0.02 solar masses for a radius of 1.14+0.08−0.01 solar radii, or a density of 0.73±0.17 grams per cubic centimeter.

Planetary system WASP-20b is a transiting hot Jupiter discovered in 2014. WASP-20b orbits WASP-20 in less than five Earth days very close to its star (0.06 AU) in a circular (near-zero eccentricity) orbit. The orbit is inclined by 85.56°±0.22° relative to the plane of the sky and is thus edge-on, as necessary for a transit to be observed.

See also Wide Angle Search for Planets Lists of planets

References

Worked examples

Example 1 — a first encounter with WASP-20

Start with the simplest possible case. Write down what WASP-20 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-20 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-20 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-20

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

Read the reference excerpt below once, without taking notes.
Close the page and write down what WASP-20 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-20 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is WASP-20 in simple terms?

Why does WASP-20 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-20?

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-20.