astronomy

K2-24

K2-24 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 K2-24 rather than just read about it. In short: K2-24 (also known as EPIC 203771098) is a metal-rich G3-type star larger and more massive than the Sun, located 560 light-years (172 parsecs) away in the constellation Scorpius. Two confirmed transiting exoplanets are known to orbit this star.

Key takeaways

K2-24 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect K2-24 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of K2-24 from memory before moving on to harder problems.

Reference excerpt

K2-24 (also known as EPIC 203771098) is a metal-rich G3-type star larger and more massive than the Sun, located 560 light-years (172 parsecs) away in the constellation Scorpius. Two confirmed transiting exoplanets are known to orbit this star. An attempt to detect stellar companions using adaptive optics imaging at the Keck telescope was negative however later observations using lucky imaging at the Danish 1.54 m telescope at La Silla Observatory detected a possible companion at 3.8 arcseconds distance from K2-24. This candidate companion being over 8 magnitudes fainter than K2-24 and with a color temperature of 5400 Kelvin, is inconsistent with a bound main sequence companion.

Planetary system

Discovery Erik A. Petigura and team analyzed data obtained from the Kepler space telescope during its observation of the K2 Campaign 2 field. They reported the discovery and confirmation of both planets b and c. The Planetary signals were independently detected by Andrew Vanderburg and collaborators.

Characteristics

The two known planets in this system have radii equal to 5.4 and 7.5 times that of the Earth. This places both planets radii between that of Uranus and Saturn, a range not present within the Solar System. With orbital periods of 20.9 days and 42.4 days, the planets are within 1% of the 2:1 mean-motion resonance. The low observed eccentricities and near orbital resonance provide evidence regarding the formation and evolution of the system, suggesting that they could possibly have resulted from gravitational interactions with a protoplanetary disk. K2-24c at 15.4 earth masses is significantly lighter than K2-24b's 19 Earth masses despite being a larger planet. It is estimated that K2-24b's atmosphere makes up 26% of its mass while K2-24c's atmosphere makes up 52%. The current model of core-nucleated accretion predicts that runaway accretion should occur when a planet reaches approximately 50% atmosphere by mass, this makes K2-24c a potential challenge to the model. There is also a candidate planet, K2-24d, with a mass of 53 M🜨 and an orbital period of 470 days. While the radial velocity signal of planet was confirmed, no validation tests were run to confirm its existence, rendering it as unconfirmed. A transit observation of K2-24b with the Hubble Space Telescope's Wide Field Camera 3 suggested the presence of ammonia, in a high abundance, but did not find evidence for water.

References

External links The Extrasolar Planets Encyclopaedia entry for K2-24b The Extrasolar Planets Encyclopaedia entry for K2-24c

Illustrations

Worked examples

Example 1 — a first encounter with K2-24

Start with the simplest possible case. Write down what K2-24 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 K2-24 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 K2-24 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 K2-24

In research: K2-24 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 K2-24 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: K2-24 is common in secondary-school and first-year university syllabi. It links to neighbouring topics G-type subgiants, Planetary systems with two confirmed planets, Planetary transit variables, so understanding it makes those chapters shorter.
In everyday life: Look for K2-24 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 K2-24 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what K2-24 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 K2-24 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is K2-24 in simple terms?

Why does K2-24 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 K2-24?

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 K2-24.