astronomy

HD 142245

HD 142245 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 142245 rather than just read about it. In short: HD 142245 is a hierarchical triple star system about 318 light-years away. The primary subgiant star HD 142245 A belongs to the spectral class of K0.

Key takeaways

HD 142245 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 142245 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 142245 from memory before moving on to harder problems.

Reference excerpt

HD 142245 is a hierarchical triple star system about 318 light-years away. The primary subgiant star HD 142245 A belongs to the spectral class of K0. Its age is much younger than Sun`s at 2.855±0.514 billion years. The primary star is slightly enriched by heavy elements, having 160% of solar abundance. In 2014, the co-moving binary stellar companion HD 142245 BC was detected. It consists of pair of red dwarf stars with composite spectral class M1, orbiting each other on 4 AU orbit. No other stellar companions were found at projected separations from 5.48 to 153.34 AU around HD 142245 A.

Planetary system In 2011 one superjovian planet HD 142245 A b on a mildly eccentric orbit around star HD 142245 A was discovered utilizing the radial velocity method.

References

Worked examples

Example 1 — a first encounter with HD 142245

Start with the simplest possible case. Write down what HD 142245 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 142245 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 142245 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 142245

In research: HD 142245 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 142245 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 142245 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Durchmusterung objects, Henry Draper Catalogue objects, Hipparcos objects, so understanding it makes those chapters shorter.
In everyday life: Look for HD 142245 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 142245 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 142245 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 142245 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 142245 in simple terms?

HD 142245 is a hierarchical triple star system about 318 light-years away. The primary subgiant star HD 142245 A belongs to the spectral class of K0.

Why does HD 142245 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 142245?

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 142245.