astronomy

HD 83380

HD 83380 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 83380 rather than just read about it. In short: HD 83380 (HR 3833) is an orange-hued star in the southern constellation of Antlia. It shines faintly with an apparent magnitude of 5.62 when viewed in ideal conditions.

Key takeaways

HD 83380 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 83380 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 83380 from memory before moving on to harder problems.

Reference excerpt

HD 83380 (HR 3833) is an orange-hued star in the southern constellation of Antlia. It shines faintly with an apparent magnitude of 5.62 when viewed in ideal conditions. Parallax measurements place the object at distance of 312 light-years. It has a heliocentric radial velocity of −2.6 km/s, indicating that it is drifting towards the Solar System. HD 83380 has a stellar classification of K1 III, indicating that it is an evolved red giant. Gaia DR3 stellar evolution models place the object on the red giant branch. At present it has 2.17 times the mass of the Sun and an enlarged radius of 10.3 R☉. It shines with a luminosity 55 times greater than the Sun from its photosphere at an effective temperature of 4,905 K. HD 83380 is slightly metal enriched with a metallicity 126% that of the Sun. It spins with a projected rotational velocity too low to be measured accurately, and is believed to be a member of the thin disk population. The multiplicity status of HD 83380 isn't generally agreed on. De Mederios et al. (2014) found it to be a probable spectroscopic binary while Eggleton and Tokovinin (2008) list it as a solitary star.

References

Illustrations

Worked examples

Example 1 — a first encounter with HD 83380

Start with the simplest possible case. Write down what HD 83380 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 83380 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 83380 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 83380

In research: HD 83380 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 83380 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 83380 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Antlia, Bright Star Catalogue objects, Durchmusterung objects, so understanding it makes those chapters shorter.
In everyday life: Look for HD 83380 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 83380 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 83380 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 83380 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 83380 in simple terms?

HD 83380 (HR 3833) is an orange-hued star in the southern constellation of Antlia. It shines faintly with an apparent magnitude of 5.62 when viewed in ideal conditions.

Why does HD 83380 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 83380?

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 83380.