astronomy

HD 88836

HD 88836 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 88836 rather than just read about it. In short: HD 88836, also known as HR 4019, is a solitary, yellow-hued star located in the southern constellation Antlia. It has an apparent magnitude of 6.32, placing it near the limit for naked eye visibility.

Key takeaways

HD 88836 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 88836 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 88836 from memory before moving on to harder problems.

Reference excerpt

HD 88836, also known as HR 4019, is a solitary, yellow-hued star located in the southern constellation Antlia. It has an apparent magnitude of 6.32, placing it near the limit for naked eye visibility. Based on an annual parallax shift of 7.019 mas, the object is estimated to be 465 light years away from the Solar System. Its distance from the Sun does not appear to be changing, having a radial velocity of 0 km/s. HD 88836 has a stellar classification of G8 III, indicating that it is an evolved red giant. Gaia Data Release 3 stellar evolution models place it on the red giant branch. At present it has 2.3 times the mass of the Sun but has expanded to 10 times its girth. It shines with a luminosity of 58.3 L☉ from its enlarged photosphere at an effective temperature of 5,055 K. HD 88836 metallicity – what astronomers dub as a star's abundance of elements heavier than helium – is around solar level. Like most giants, the object spins slowly, having a projected rotational velocity of 1.6 km/s. There is a 13th magnitude companion located 10.9″ away along a position angle of 209°, which was first noticed by R.A. Rossiter in 1912. It is unknown if its physically related to HD 88836 or not, although its Gaia Data Release 3 parallax is much smaller than HD 88836's.

References

External links Image HD 88836

Worked examples

Example 1 — a first encounter with HD 88836

Start with the simplest possible case. Write down what HD 88836 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 88836 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 88836 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 88836

In research: HD 88836 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 88836 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 88836 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Antlia, Bright Star Catalogue objects, Double stars, so understanding it makes those chapters shorter.
In everyday life: Look for HD 88836 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 88836 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 88836 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 88836 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 88836 in simple terms?

Why does HD 88836 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 88836?

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 88836.