astronomy

NGC 89

NGC 89 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 89 rather than just read about it. In short: NGC 89 is an unbarred spiral galaxy located approximately 150 million light-years away in the southern constellation of Phoenix. It was discovered on September 30, 1834, by the English astronomer John Herschel.

Key takeaways

NGC 89 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 89 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 89 from memory before moving on to harder problems.

Reference excerpt

NGC 89 is an unbarred spiral galaxy located approximately 150 million light-years away in the southern constellation of Phoenix. It was discovered on September 30, 1834, by the English astronomer John Herschel.

Physical characteristics NGC 87 is classified morphologically as a barred or intermediate spiral galaxy with peculiar features induced by tidal perturbation. At its distance of 150 million light-years, its angular diameter corresponds to a physical size of roughly 50,000 light-years across. The galaxy features an active galactic nucleus (AGN) classified as a Seyfert 2 nucleus. High-resolution imaging reveals a prominent dust lane crossing the central region and asymmetric spiral arms displaying star-forming regions triggered by interaction with its neighbors.

Group membership NGC 89 is a member of Robert's Quartet, a compact galaxy group located in Phoenix that also includes NGC 87, NGC 88, and NGC 92. The four member galaxies reside within a region spanning roughly 150,000 light-years across and exhibit active gravitational interactions.

See also Robert's Quartet NGC 87 NGC 88 NGC 92

References

External links Media related to NGC 89 at Wikimedia Commons NGC 89

NGC 89 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 89

Start with the simplest possible case. Write down what NGC 89 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 89 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 89 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 89

In research: NGC 89 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 89 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 89 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1834, Barred spiral galaxies, ESO objects, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 89 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 89 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 89 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 89 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 89 in simple terms?

Why does NGC 89 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 89?

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 89.