astronomy

HD 143699

HD 143699 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 143699 rather than just read about it. In short: HD 143699 is a single star in the southern constellation of Lupus. It is a dim star but visible to the naked eye with an apparent visual magnitude of 4.90.

Key takeaways

HD 143699 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 143699 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 143699 from memory before moving on to harder problems.

Reference excerpt

HD 143699 is a single star in the southern constellation of Lupus. It is a dim star but visible to the naked eye with an apparent visual magnitude of 4.90. Based upon an annual parallax shift of 9.2 mas, it is located around 350 light years away. It is most likely (90% chance) a member of the Upper Centaurus–Lupus subgroup of the Sco OB2 moving group. This star has a stellar classification of B5/7 III/IV, suggesting it is an evolving star that is entering the giant stage. However, according to Zorec and Royer (2012) it is only 56% of the way through its main sequence lifespan. It is a chemically peculiar magnetic B star, showing an averaged quadratic field strength of (167.2±140.4)×10−3 T. Helium-weak, it displays an underabundance of helium in its spectrum. Radio emissions have been detected from this source. HD 143699 has 4.6 times the mass of the Sun and 3.9 times the Sun's radius. It has a high rate of spin with a projected rotational velocity of 115 km/s, resulting in a short rotation period of 0.894 days. The star is radiating 447 times the Sun's luminosity from its photosphere at an effective temperature of 15,480 K.

References

Illustrations

Worked examples

Example 1 — a first encounter with HD 143699

Start with the simplest possible case. Write down what HD 143699 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 143699 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 143699 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 143699

In research: HD 143699 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 143699 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 143699 is common in secondary-school and first-year university syllabi. It links to neighbouring topics B-type subgiants, Bright Star Catalogue objects, Durchmusterung objects, so understanding it makes those chapters shorter.
In everyday life: Look for HD 143699 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 143699 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 143699 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 143699 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 143699 in simple terms?

HD 143699 is a single star in the southern constellation of Lupus. It is a dim star but visible to the naked eye with an apparent visual magnitude of 4.90.

Why does HD 143699 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 143699?

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 143699.