astronomy

NGC 4650

NGC 4650 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 4650 rather than just read about it. In short: NGC 4650 is a large barred spiral galaxy in the constellation of Centaurus. Its velocity with respect to the cosmic microwave background is 3,239±42 km/s, which corresponds to a Hubble distance of 155.8 ± 11.2 Mly (47.77 ± 3.44 Mpc).

Key takeaways

NGC 4650 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 4650 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 4650 from memory before moving on to harder problems.

Reference excerpt

NGC 4650 is a large barred spiral galaxy in the constellation of Centaurus. Its velocity with respect to the cosmic microwave background is 3,239±42 km/s, which corresponds to a Hubble distance of 155.8 ± 11.2 Mly (47.77 ± 3.44 Mpc). Additionally, one non-redshift measurement gives a closer distance of 151.34 Mly (46.400 Mpc). It was discovered by British astronomer John Herschel on 26 June 1834. NGC 4650 is a Seyfert II galaxy, i.e. it has a quasar-like nucleus with very high surface brightnesses whose spectra reveal strong, high-ionisation emission lines, but unlike quasars, the host galaxy is clearly detectable.

NGC 4696 group and Centaurus Cluster NGC 4650 belongs to the 79-member NGC 4696 galaxy group (also known as LGG 298). Some of the other members in the group include NGC 4373, NGC 4499, NGC 4507, NGC 4553, NGC 4743, NGC 4744, NGC 4767, NGC 4811, NGC 4812 and NGC 4832. NGC 4650 is also a member of the Centaurus Cluster.

See also List of NGC objects (4001–5000)

References

External links Media related to NGC 4650 at Wikimedia Commons NGC 4650 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 4650

Start with the simplest possible case. Write down what NGC 4650 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 4650 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 4650 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 4650

In research: NGC 4650 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 4650 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 4650 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1834, Barred spiral galaxies, Centaurus, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 4650 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 4650 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 4650 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 4650 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 4650 in simple terms?

Why does NGC 4650 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 4650?

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 4650.