astronomy

HD 143787

HD 143787 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 143787 rather than just read about it. In short: HD 143787 is a single star in the southern constellation of Scorpius. It is a fifth magnitude star – apparent visual magnitude of 4.973, and hence is visible to the unaided eye.

Key takeaways

HD 143787 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 143787 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 143787 from memory before moving on to harder problems.

Reference excerpt

HD 143787 is a single star in the southern constellation of Scorpius. It is a fifth magnitude star – apparent visual magnitude of 4.973, and hence is visible to the unaided eye. The distance to HD 143787 can be estimated from its annual parallax shift of 14.4 mas, yielding a separation of 227 light years. It is moving closer to Earth with a heliocentric radial velocity of −37.9 km/s, and should come within 106.4 ly in 1.2 million years. This is an evolved giant star with a stellar classification of K3 III. It is a red clump giant, which means it is on the horizontal branch and is generating energy through helium fusion at its core. At the age of 4.46 billion years, it has 1.25 times the mass of the Sun and is radiating 61.7 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,370 K.

References

Worked examples

Example 1 — a first encounter with HD 143787

Start with the simplest possible case. Write down what HD 143787 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 143787 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 143787 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 143787

In research: HD 143787 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 143787 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 143787 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bright Star Catalogue objects, Durchmusterung objects, Henry Draper Catalogue objects, so understanding it makes those chapters shorter.
In everyday life: Look for HD 143787 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 143787 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 143787 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 143787 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 143787 in simple terms?

HD 143787 is a single star in the southern constellation of Scorpius. It is a fifth magnitude star – apparent visual magnitude of 4.973, and hence is visible to the unaided eye.

Why does HD 143787 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 143787?

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 143787.