astronomy

NGC 523

NGC 523 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 523 rather than just read about it. In short: NGC 523, also known as Arp 158 from the ARP catalog, is a spiral galaxy located in the constellation Andromeda. It was discovered by German-British astronomer William Herschel on 13 September 1784.

Key takeaways

NGC 523 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 523 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 523 from memory before moving on to harder problems.

Reference excerpt

NGC 523, also known as Arp 158 from the ARP catalog, is a spiral galaxy located in the constellation Andromeda. It was discovered by German-British astronomer William Herschel on 13 September 1784. Heinrich d'Arrest rediscovered it on 13 August 1862 and listed it as NGC 523, whereas Herschel's original discovery was listed as NGC 537. John Dreyer noted in the New General Catalogue that NGC 523 is a double nebula.

Supernova One supernova has been observed in NGC 523: SN 2001en (Type Ia, mag. 17.5) was discovered by LOTOSS (Lick Observatory and Tenagra Observatory Supernova Searches) on 26 September 2001.

NGC 507 Group NGC 523 is part of the NGC 507 group (also known as LGG 26). This large group includes at least 42 galaxies, of which 21 are in the New General Catalogue and 5 in the Index Catalog. Four members of this group are also Markarian galaxies. The brightest of these galaxies is NGC 507 and the largest is NGC 536.

See also Spiral galaxy List of NGC objects (1–1000) Andromeda (constellation)

References

External links Media related to NGC 523 at Wikimedia Commons

NGC 523 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images SEDS

Illustrations

Worked examples

Example 1 — a first encounter with NGC 523

Start with the simplest possible case. Write down what NGC 523 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 523 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 523 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 523

In research: NGC 523 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 523 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 523 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Andromeda (constellation), Arp objects, Astronomical objects discovered in 1784, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 523 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 523 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 523 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 523 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 523 in simple terms?

NGC 523, also known as Arp 158 from the ARP catalog, is a spiral galaxy located in the constellation Andromeda. It was discovered by German-British astronomer William Herschel on 13 September 1784.

Why does NGC 523 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 523?

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 523.