astronomy

KELT-24

KELT-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 KELT-24 rather than just read about it. In short: KELT-24 (HD 93148, MASCARA-3) is a multiple star system in the constellation Ursa Major at a distance of approximately 316 light-years (about 96.9 parsecs) from Sun. The apparent magnitude of the primary star is +8.33.

Key takeaways

KELT-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 KELT-24 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of KELT-24 from memory before moving on to harder problems.

Reference excerpt

KELT-24 (HD 93148, MASCARA-3) is a multiple star system in the constellation Ursa Major at a distance of approximately 316 light-years (about 96.9 parsecs) from Sun. The apparent magnitude of the primary star is +8.33. The star's age is estimated to be about 2.8 billion years. As an F-type main-sequence star, it is similar to the Sun, but slightly hotter, larger, and more luminous. KELT-24 has a single known exoplanet, a hot Jupiter only 11 R☉ from the star.

Nomenclature This star was first catalogued in the Henry Draper Catalogue as HD 93148. The Henry Draper Catalogue gave stars visible to the naked eye in suitable conditions a designation, indicating that this star can be seen with the naked eye. But in 2019, the Multi-site All-Sky Camera and the Kilodegree Extremely Little Telescope announced the discovery of the exoplanet KELT-24b/MASCARA-3b around this star. Thus, it is most commonly known as KELT-24, although the star is sometimes catalogued as MASCARA-3. The common proper motion companion is referred to as HD 93148B or KELT-24B, or KELT-24BC when it is being treated as a spectroscopic binary.

Star system KELT-24 is an 8th-magnitude F-type star with a faint companion separated by 2″. The companion is over-luminous for a normal star of its colour and is suspected to be a binary consisting of two red dwarfs. KELT-24 is a yellow-white star with a spectral class of F5. Its mass is about 1.3 M☉, its radius is about 1.5 R☉, and its luminosity is about 3.5 L☉. Its effective temperature is about 6,437 K. An age of 2.8 billion years has been calculated, but the 68% confidence interval ranges from 2.0 to 6.9 billion years. Age estimates in the original discovery papers were 0.78 and 2.8 billion years respectively. KELT-24B, or KELT-24BC when both components are being referred to, is suspected of being an eclipsing binary although only a single "transit-like event" has been observed. The best model fit is two near-identical red dwarfs each with a mass about half the Sun's and a luminosity less than 4% of the Sun's.

Planetary system In 2019, the discovery of the Hot Jupiter type planet KELT-24b/MASCARA-3b was announced by the Multi-site All-Sky CAmeRA and the Kilodegree Extremely Little Telescope. TESS data confirmed that no additional companions are orbiting this star.

References

External links KELT-24 NASA Exoplanet Archive

Worked examples

Example 1 — a first encounter with KELT-24

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

In research: KELT-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 KELT-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: KELT-24 is common in secondary-school and first-year university syllabi. It links to neighbouring topics F-type main-sequence stars, Planetary systems with one confirmed planet, Ursa Major, so understanding it makes those chapters shorter.
In everyday life: Look for KELT-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 KELT-24 in 20 minutes

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

Frequently asked questions

What is KELT-24 in simple terms?

Why does KELT-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 KELT-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 KELT-24.