astronomy

Kepler-28b

Kepler-28b 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 Kepler-28b rather than just read about it. In short: Kepler-28b is an extrasolar planet orbiting the star Kepler-28. It is a transiting planet that is smaller than Jupiter that orbits very closely to Kepler-28.

Key takeaways

Kepler-28b belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Kepler-28b to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Kepler-28b from memory before moving on to harder problems.

Reference excerpt

Kepler-28b is an extrasolar planet orbiting the star Kepler-28. It is a transiting planet that is smaller than Jupiter that orbits very closely to Kepler-28.

Host star

Kepler-28 is the host star of Kepler-28b, and is alternatively known as KOI-870 and KIC 6949607. The star is smaller, less massive, and cooler than the Sun, with (respectively) a radius 0.7 times of the Sun; a mass 0.75 times of the Sun; and an effective temperature of 4590 K. The star has a high metallicity with relation to the Sun, equal to [M/H] = 0.34. With an apparent magnitude of 15.05, Kepler-28 is invisible to the naked eye from Earth, requiring a medium-size telescope to see it.

Characteristics Kepler-28b is a gas giant. Upon discovery, it was poorly characterized, with only an upper mass limit of 1.51 times the mass of Jupiter (which, given its radius, would imply an impossibly low density) ascertained from dynamical simulations. The planet transits its host star over 2.77 hours of each orbit, making a shadow we can detect from earth. In 2016 improved radial velocity data made it possible to classify Kepler-28b as a small (sub-Neptune) gas giant.

References

Worked examples

Example 1 — a first encounter with Kepler-28b

Start with the simplest possible case. Write down what Kepler-28b 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 Kepler-28b 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 Kepler-28b 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 Kepler-28b

In research: Kepler-28b 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 Kepler-28b 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: Kepler-28b is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cygnus (constellation), Exoplanet stubs, Exoplanets discovered by the Kepler space telescope, so understanding it makes those chapters shorter.
In everyday life: Look for Kepler-28b 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 Kepler-28b in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Kepler-28b 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 Kepler-28b out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Kepler-28b in simple terms?

Kepler-28b is an extrasolar planet orbiting the star Kepler-28. It is a transiting planet that is smaller than Jupiter that orbits very closely to Kepler-28.

Why does Kepler-28b 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 Kepler-28b?

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 Kepler-28b.