astronomy

NGC 4393

NGC 4393 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 4393 rather than just read about it. In short: NGC 4393 is a spiral galaxy about 46 million light-years away in the constellation Coma Berenices. It was discovered by astronomer William Herschel on April 11, 1785.

Key takeaways

NGC 4393 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 4393 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 4393 from memory before moving on to harder problems.

Reference excerpt

NGC 4393 is a spiral galaxy about 46 million light-years away in the constellation Coma Berenices. It was discovered by astronomer William Herschel on April 11, 1785. It is a member of the NGC 4274 Group, which is part of the Coma I Group or Cloud.

Physical characteristics NGC 4393 is a flocculent spiral galaxy, with chaotic, fragmented and unsymmetric arms. IC 3329, an HII region in NGC 4393, was discovered by astronomer Max Wolf on March 23, 1903. It was described as "very faint, small, irregular figure, attached to (NGC) 4393". NGC 4393 hosts a pseudo-bulge, a type of galactic bulge which is more similar to a spiral galaxy in that it has one or more characteristics of disk galaxies. These include having flatter shapes than those of classical bulges, large ratios of ordered motions of stars rather than random motions of stars, small velocity dispersions of stars with respect to the Faber-Jackson correlation between velocity dispersion and bulge luminosity, a spiral structure or nuclear bar in the bulge part of the light profile, nearly exponential brightness profiles, and starbursts.

Nuclear Star Cluster The central region of NGC 4393 is host to a nuclear star cluster with a mass of 0.4048 ± 0.0819 million M☉, and a diameter of ~16 ly (4.8 pc).

See also List of NGC objects (4001–5000) Coma I

References

External links

NGC 4393 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 4393

Start with the simplest possible case. Write down what NGC 4393 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 4393 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 4393 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 4393

In research: NGC 4393 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 4393 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 4393 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1785, Coma Berenices, Coma I Group, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 4393 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 4393 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 4393 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 4393 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 4393 in simple terms?

NGC 4393 is a spiral galaxy about 46 million light-years away in the constellation Coma Berenices. It was discovered by astronomer William Herschel on April 11, 1785.

Why does NGC 4393 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 4393?

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 4393.