astronomy

KELT-4Ab

KELT-4Ab 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 KELT-4Ab rather than just read about it. In short: KELT-4Ab is an extrasolar planet that orbits the star KELT-4A, in the star system KELT-4. The planet is approximately 760 ly (230 pc) away in the constellation of Leo.

Key takeaways

KELT-4Ab belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect KELT-4Ab to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of KELT-4Ab from memory before moving on to harder problems.

Reference excerpt

KELT-4Ab is an extrasolar planet that orbits the star KELT-4A, in the star system KELT-4. The planet is approximately 760 ly (230 pc) away in the constellation of Leo. The planet was discovered by the Kilodegree Extremely Little Telescope (KELT).

Characteristics The exoplanet was discovered by transit and is a Hot Jupiter planet orbiting a star in a triple star system, KELT-4. It is the fourth planet found in such a system. As KELT-4A is the brightest host (V~10) of a Hot Jupiter in a hierarchical triple stellar system found so far researchers expect it may be useful in learning more about inflated planets.

Star system KELT-4 is a triple star system. KELT-4BC is a binary star system subcomponent of the triple, 328 ± 16 AU (4.91×1010 ± 2.4×109 km; 3.05×1010 ± 1.5×109 mi) away from KELT-4A and the projected separation between KELT-4B and KELT-4C is 10.30 ± 0.74 AU (1.541×109 ± 111,000,000 km; 957,000,000 ± 69,000,000 mi).

See also Gliese 667 Cc, a planet in a triple star system KELT-2Ab, a previous planet discovered by the KELT survey, in a binary system

References

External links KELT-North survey website Archived 2019-01-24 at the Wayback Machine Open Exoplanet Catalogue Entry

Worked examples

Example 1 — a first encounter with KELT-4Ab

Start with the simplest possible case. Write down what KELT-4Ab 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 KELT-4Ab 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 KELT-4Ab 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 KELT-4Ab

In research: KELT-4Ab 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 KELT-4Ab 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: KELT-4Ab is common in secondary-school and first-year university syllabi. It links to neighbouring topics Exoplanet stubs, Exoplanets discovered by KELT, Exoplanets discovered in 2015, so understanding it makes those chapters shorter.
In everyday life: Look for KELT-4Ab 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 KELT-4Ab in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what KELT-4Ab 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 KELT-4Ab out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is KELT-4Ab in simple terms?

KELT-4Ab is an extrasolar planet that orbits the star KELT-4A, in the star system KELT-4. The planet is approximately 760 ly (230 pc) away in the constellation of Leo.

Why does KELT-4Ab 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 KELT-4Ab?

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 KELT-4Ab.