astronomy

NGC 4696

NGC 4696 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 4696 rather than just read about it. In short: NGC 4696 is an elliptical galaxy in the constellation Centaurus. Its velocity with respect to the cosmic microwave background is 3,251±23 km/s, which corresponds to a Hubble distance of 156.4 ± 11.0 Mly (47.95 ± 3.38 Mpc).

Key takeaways

NGC 4696 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 4696 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 4696 from memory before moving on to harder problems.

Reference excerpt

NGC 4696 is an elliptical galaxy in the constellation Centaurus. Its velocity with respect to the cosmic microwave background is 3,251±23 km/s, which corresponds to a Hubble distance of 156.4 ± 11.0 Mly (47.95 ± 3.38 Mpc). However, 25 non-redshift measurements give a much closer mean distance of 122.63 ± 3.90 Mly (37.600 ± 1.196 Mpc). It was discovered by British astronomer James Dunlop on 7 May 1826. NGC 4696 is the brightest galaxy in the Centaurus Cluster, a large, rich cluster of galaxies in the constellation of the same name. The galaxy is surrounded by many dwarf elliptical galaxies also located within the cluster. There is believed to be a supermassive black hole at the center of the galaxy.

Supernova One supernova has been observed in NGC 4696:

SN 2017ejb (Type Ia, mag. 17.2078) was discovered by the Distance Less Than 40 Mpc Survey (DLT40) on 28 May 2017.

References

External links Media related to NGC 4696 at Wikimedia Commons http://www.eurekalert.org/pub_releases/2010-08/eic-n4a081010.php http://apod.nasa.gov/apod/ap161207.html

Illustrations

Worked examples

Example 1 — a first encounter with NGC 4696

Start with the simplest possible case. Write down what NGC 4696 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 4696 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 4696 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 4696

In research: NGC 4696 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 4696 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 4696 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1826, Centaurus, Centaurus Cluster, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 4696 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 4696 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 4696 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 4696 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 4696 in simple terms?

Why does NGC 4696 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 4696?

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 4696.