astronomy

HD 141399

HD 141399 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 HD 141399 rather than just read about it. In short: HD 141399 is a K-type subgiant star 121 light-years away in the constellation of Boötes. Its surface temperature is 5602 K.

Key takeaways

HD 141399 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect HD 141399 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 141399 from memory before moving on to harder problems.

Reference excerpt

HD 141399 is a K-type subgiant star 121 light-years away in the constellation of Boötes. Its surface temperature is 5602 K. HD 141399 is enriched in heavy elements compared to the Sun, with a metallicity Fe/H index of 0.36±0.03. The star has very low starspot activity.

Planetary system In 2014, four planets orbiting HD 141399 were discovered by the radial velocity method. Planet HD 141399c is possibly located within the habitable zone. The planetary orbits are close to high-order mean-motion resonance and closely conform to the Titius–Bode law. Two additional planets, one with a period of 462.9 days, are suspected by analogy with the orbits of the Solar System planets. The planetary orbits around HD 141399 are expected to "jump" periodically on a timescale of a few million years between several quasi-stable configurations due to planet-planet interactions. HD 141399 is one of only two known planetary systems consisting of at least four massive gas giants (the other is the system of planets around the young star HR 8799).

References

Illustrations

Worked examples

Example 1 — a first encounter with HD 141399

Start with the simplest possible case. Write down what HD 141399 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 HD 141399 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 HD 141399 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 HD 141399

In research: HD 141399 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 HD 141399 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: HD 141399 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Boötes, Durchmusterung objects, Henry Draper Catalogue objects, so understanding it makes those chapters shorter.
In everyday life: Look for HD 141399 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 HD 141399 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 141399 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 HD 141399 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 141399 in simple terms?

HD 141399 is a K-type subgiant star 121 light-years away in the constellation of Boötes. Its surface temperature is 5602 K.

Why does HD 141399 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 HD 141399?

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 HD 141399.