astronomy

HD 108863

HD 108863 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 108863 rather than just read about it. In short: HD 108863 is a giant star, the primary of a binary star system about 541 light-years away, belonging to spectral class K0. Its age is younger than the Sun's at 1.8±0.4 billion years.

Key takeaways

HD 108863 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 108863 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 108863 from memory before moving on to harder problems.

Reference excerpt

HD 108863 is a giant star, the primary of a binary star system about 541 light-years away, belonging to spectral class K0. Its age is younger than the Sun's at 1.8±0.4 billion years. The primary star is slightly enriched in heavy elements, having 115% of solar abundance. The primary star does not have detectable flare activity. In 2014, a poorly characterized co-moving stellar companion HD 108863 B, likely a main sequence star of spectral class between F6 and G4, was discovered at a projected separation of 16.065 AU.

Planetary system In 2011 one superjovian planet, HD 108863 b, on a nearly circular orbit around star HD 108863 was discovered utilizing the radial velocity method. The planet does not transit its host star.

References

Worked examples

Example 1 — a first encounter with HD 108863

Start with the simplest possible case. Write down what HD 108863 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 108863 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 108863 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 108863

In research: HD 108863 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 108863 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 108863 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Binary stars, Coma Berenices, Durchmusterung objects, so understanding it makes those chapters shorter.
In everyday life: Look for HD 108863 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 108863 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 108863 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 108863 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 108863 in simple terms?

HD 108863 is a giant star, the primary of a binary star system about 541 light-years away, belonging to spectral class K0. Its age is younger than the Sun's at 1.8±0.4 billion years.

Why does HD 108863 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 108863?

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 108863.