astronomy

NGC 1617

NGC 1617 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 1617 rather than just read about it. In short: NGC 1617 is a spiral galaxy in the constellation Dorado. The galaxy lies about 45 million light years away from Earth, which means, given its apparent dimensions, that NGC 1617 is approximately 70,000 light years across.

Key takeaways

NGC 1617 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 1617 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 1617 from memory before moving on to harder problems.

Reference excerpt

NGC 1617 is a spiral galaxy in the constellation Dorado. The galaxy lies about 45 million light years away from Earth, which means, given its apparent dimensions, that NGC 1617 is approximately 70,000 light years across. It was discovered by James Dunlop on November 5, 1826. It is a member of the Dorado Group. NGC 1617 has an elliptical bulge with a bright nuclear source. The bulge is smooth, with the exception of some off-centre dust lanes. The galaxy has a weak bar and a very smooth disk, with no evidence of star formation knots. The disk is slightly asymmetric, extending a bit more towards the south. An outer ring forms the edges of the disk. The arms are tightly wound, forming a ring after half a revolution. Two dust knots are visible in submillimeter emission along the major axis of the galaxy. NGC 1617 lies 35 arcminutes north of Alpha Doradus. IC 2085 lies 11 arcminutes north of NGC 1617.

References

External links

NGC 1617 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images

Illustrations

Worked examples

Example 1 — a first encounter with NGC 1617

Start with the simplest possible case. Write down what NGC 1617 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 1617 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 1617 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 1617

In research: NGC 1617 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 1617 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 1617 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1826, Discoveries by James Dunlop, Dorado, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 1617 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 1617 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 1617 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 1617 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 1617 in simple terms?

Why does NGC 1617 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 1617?

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 1617.