astronomy

HD 106248

HD 106248 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 106248 rather than just read about it. In short: HD 106248, also known as HR 4649, is a solitary, orange hued star located in the southern circumpolar constellation Chamaeleon. It has an apparent magnitude of 6.34, placing it near the limit for naked eye visibility.

Key takeaways

HD 106248 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 106248 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 106248 from memory before moving on to harder problems.

Reference excerpt

HD 106248, also known as HR 4649, is a solitary, orange hued star located in the southern circumpolar constellation Chamaeleon. It has an apparent magnitude of 6.34, placing it near the limit for naked eye visibility. Based on parallax measurements from Gaia DR3, the object is estimated to be 358 light years away from the Solar System. It appears to be receding with a heliocentric radial velocity of 34.5 km/s. At its current distance, HD 106248's brightness is diminished by 0.32 due to interstellar dust and Eggen (1993) lists it as a member of the old (thick) disk population. This is an evolved red giant with a stellar classification of K2/3 III CNII—intermediate between a K2 and K3 giant star. The CNII suffix indicates that it has a strong overabundance of cyano radicals in its spectrum, making it a CN star. It has 119% the mass of the Sun and is estimated to be 4.31 billion years old, slightly younger than the Sun. However, HD 106248 has already left the main sequence and has an enlarged radius of 10.9 R☉. It radiates 49 times the luminosity of the Sun from its photosphere at an effective temperature of 4,700 K. The star has a solar metallicity and spins slowly with a projected rotational velocity lower than 1.5 km/s.

References

Illustrations

Worked examples

Example 1 — a first encounter with HD 106248

Start with the simplest possible case. Write down what HD 106248 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 106248 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 106248 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 106248

In research: HD 106248 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 106248 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 106248 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bright Star Catalogue objects, CN stars, Chamaeleon, so understanding it makes those chapters shorter.
In everyday life: Look for HD 106248 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 106248 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 106248 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 106248 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 106248 in simple terms?

Why does HD 106248 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 106248?

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 106248.