astronomy

HD 130917

HD 130917 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 130917 rather than just read about it. In short: HD 130917 is a single star in the northern constellation of Boötes. It is an A-type main sequence star with a stellar classification of A4V.

Key takeaways

HD 130917 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 130917 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 130917 from memory before moving on to harder problems.

Reference excerpt

HD 130917 is a single star in the northern constellation of Boötes. It is an A-type main sequence star with a stellar classification of A4V. At an apparent magnitude of 5.80, it is visible to the naked eye under very dark skies. HD 130917 is over twice as massive as the Sun and hotter at 8,610 K. At an age of 454 million years, it is still on the main sequence but has expanded somewhat to three times the radius of the Sun and is now 43 times more luminous than the Sun.

References

External links HR 5532 CCDM J14500+2837 Image HD 130917

Worked examples

Example 1 — a first encounter with HD 130917

Start with the simplest possible case. Write down what HD 130917 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 130917 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 130917 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 130917

In research: HD 130917 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 130917 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 130917 is common in secondary-school and first-year university syllabi. It links to neighbouring topics A-type main-sequence stars, Boötes, Bright Star Catalogue objects, so understanding it makes those chapters shorter.
In everyday life: Look for HD 130917 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 130917 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 130917 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 130917 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 130917 in simple terms?

HD 130917 is a single star in the northern constellation of Boötes. It is an A-type main sequence star with a stellar classification of A4V.

Why does HD 130917 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 130917?

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 130917.