astronomy

NGC 171

NGC 171 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 NGC 171 rather than just read about it. In short: NGC 171 is a barred spiral galaxy with an apparent magnitude of 12, located around 200 million light-years away in the constellation Cetus. The galaxy has two main medium-wound arms, with a few minor arms, and a fairly bright nucleus and bulge.

Key takeaways

NGC 171 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect NGC 171 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 171 from memory before moving on to harder problems.

Reference excerpt

NGC 171 is a barred spiral galaxy with an apparent magnitude of 12, located around 200 million light-years away in the constellation Cetus. The galaxy has two main medium-wound arms, with a few minor arms, and a fairly bright nucleus and bulge. It was discovered on 20 October 1784 by William Herschel. It is also known as NGC 175.

Supernova One supernova has been observed in NGC 171: SN 2009hf (Type II-P, mag. 17.2) was discovered by Berto Monard on 9 July 2009.

Illustrations

Worked examples

Example 1 — a first encounter with NGC 171

Start with the simplest possible case. Write down what NGC 171 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 NGC 171 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 NGC 171 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 NGC 171

In research: NGC 171 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 NGC 171 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: NGC 171 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1784, Barred spiral galaxies, Barred spiral galaxy stubs, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 171 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 NGC 171 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 171 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 NGC 171 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 171 in simple terms?

Why does NGC 171 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 NGC 171?

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 NGC 171.