astronomy

NGC 4697

NGC 4697 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 4697 rather than just read about it. In short: NGC 4697 (also known as Caldwell 52) is an elliptical galaxy some 40 to 50 million light-years away in the constellation Virgo. It is a member of the NGC 4697 Group, a group of galaxies also containing NGC 4731 and several generally much smaller galaxies.

Key takeaways

NGC 4697 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 4697 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 4697 from memory before moving on to harder problems.

Reference excerpt

NGC 4697 (also known as Caldwell 52) is an elliptical galaxy some 40 to 50 million light-years away in the constellation Virgo. It is a member of the NGC 4697 Group, a group of galaxies also containing NGC 4731 and several generally much smaller galaxies. This group is about 55 million light-years away; it is one of the many Virgo II Groups, which form a southern extension of the Virgo Supercluster of galaxies. The distance to NGC 4697 is not known with high precision: measurements vary from 28 to 76 million light-years. According to the NASA Extra-galactic Database, the average is about 38 million light-years; according to SIMBAD, about 50 million light-years. The supermassive black hole at the core of NGC 4697 has a mass of 1.3+0.18−0.17×108 M☉ as measured from Atacama Large Millimeter Array observations of the rotation of the central gas disk. One supernova has been observed in NGC 4697: SN 2018imd (type Ia, mag. 15.5). On 2 April 1950, it was occulted by the Moon during a total lunar eclipse over the Iberian Peninsula, Africa, Madagascar, Arabia and the Indian Ocean. This happened again under the same conditions on the April 1996 lunar eclipse over the same locations, and again during the April 2015 lunar eclipse over extreme NE Siberia and North America. It will next happen on 4 April 2080 over the Pacific Ocean including Hawaii.

Gallery

References

External links Media related to NGC 4697 at Wikimedia Commons NGC 4697 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 4697

Start with the simplest possible case. Write down what NGC 4697 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 4697 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 4697 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 4697

In research: NGC 4697 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 4697 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 4697 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Caldwell objects, Elliptical galaxies, NGC objects, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 4697 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 4697 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 4697 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 4697 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 4697 in simple terms?

Why does NGC 4697 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 4697?

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 4697.