astronomy

HD 108236

HD 108236 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 108236 rather than just read about it. In short: HD 108236 is a G-type main-sequence star. Its surface temperature is 5660±61 K.

Key takeaways

HD 108236 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 108236 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 108236 from memory before moving on to harder problems.

Reference excerpt

HD 108236 is a G-type main-sequence star. Its surface temperature is 5660±61 K. HD 108236 is severely depleted in heavy elements compared to the Sun, with a metallicity Fe/H index of −0.28±0.04 (52% of the Solar System), and is probably older than the Sun at an age of 6.7+3.3−3.4 billion years. According to WISE mission data, the star was suspected to be surrounded by a debris disk, but a reanalysis of the data rejected the debris disk hypothesis by 2014. The reason for the false positive was contamination from a nearby infrared source.

Planetary system

In 2020, four planets orbiting HD 108236 were discovered by the transit method, followed by another one in 2021.

See also List of exoplanets discovered in 2020 - HD 108236 b through e List of exoplanets discovered in 2021 - HD 108236 f

References

Worked examples

Example 1 — a first encounter with HD 108236

Start with the simplest possible case. Write down what HD 108236 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 108236 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 108236 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 108236

In research: HD 108236 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 108236 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 108236 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Centaurus, Durchmusterung objects, G-type main-sequence stars, so understanding it makes those chapters shorter.
In everyday life: Look for HD 108236 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 108236 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 108236 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 108236 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 108236 in simple terms?

HD 108236 is a G-type main-sequence star. Its surface temperature is 5660±61 K.

Why does HD 108236 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 108236?

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 108236.