astronomy

NGC 383

NGC 383 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 383 rather than just read about it. In short: NGC 383 is a double radio galaxy with a quasar-like appearance located in the constellation Pisces. It was discovered by German-British astronomer William Herschel on 12 September 1784.

Key takeaways

NGC 383 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 383 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 383 from memory before moving on to harder problems.

Reference excerpt

NGC 383 is a double radio galaxy with a quasar-like appearance located in the constellation Pisces. It was discovered by German-British astronomer William Herschel on 12 September 1784. It is listed as a part of Arp 331 in Halton Arp's Atlas of Peculiar Galaxies. Recent discoveries by the National Radio Astronomy Observatory in 2006 reveal that NGC 383 is being bisected by high energy relativistic jets traveling at relatively high fractions of the speed of light. The relativistic electrons in the jets are detected as synchrotron radiation in the x-ray and radio wavelengths. The focus of this intense energy is the galactic center of NGC 383. The relativistic electron jets detected as synchrotron radiation extend for several thousand parsecs and then appear to dissipate at the ends in the form of streamers or filaments. There are four other nearby galaxies NGC 379, NGC 380, NGC 385, and NGC 384 which are suspected of being closely associated with NGC 383, as well as several other galaxies at relatively close distance.

Supernovae Two supernovae have been observed in NGC 383:

SN 2015ar (Type Ia, mag. 18.8) was discovered by E. Conseil and G. Arlic on 11 November 2015. SN 2017hle (Type Ia, mag. 18) was discovered by Xingming Observatory Sky Survey (XOSS) on 18 October 2017.

See also Relativistic beaming Relativistic jets

References

External links Media related to NGC 383 at Wikimedia Commons 3C31 = B0104+321 (Alan Bridle / 18 June 2008) www.jb.man.ac.uk/atlas/ Wikisky image of NGC 383

Illustrations

NGC 383: Two jets coming from 3C 31. — Two jets coming from 3C 31.

Worked examples

Example 1 — a first encounter with NGC 383

Start with the simplest possible case. Write down what NGC 383 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 383 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 383 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 383

In research: NGC 383 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 383 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 383 is common in secondary-school and first-year university syllabi. It links to neighbouring topics 3C objects, Arp objects, Astronomical objects discovered in 1784, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 383 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 383 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 383 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 383 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 383 in simple terms?

NGC 383 is a double radio galaxy with a quasar-like appearance located in the constellation Pisces. It was discovered by German-British astronomer William Herschel on 12 September 1784.

Why does NGC 383 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 383?

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 383.