astronomy

NGC 4722

NGC 4722 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 4722 rather than just read about it. In short: NGC 4722 is a lenticular galaxy in the constellation of Corvus. Its velocity with respect to the cosmic microwave background is 1647 ± 25 km/s, which corresponds to a Hubble distance of 79.3 ± 5.7 Mly (24.3 ± 1.75 Mpc).

Key takeaways

NGC 4722 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 4722 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 4722 from memory before moving on to harder problems.

Reference excerpt

NGC 4722 is a lenticular galaxy in the constellation of Corvus. Its velocity with respect to the cosmic microwave background is 1647 ± 25 km/s, which corresponds to a Hubble distance of 79.3 ± 5.7 Mly (24.3 ± 1.75 Mpc). In addition, two non-redshift measurements give a farther distance of 89.2 ± 39.3 Mly (27.35 ± 12.05 Mpc). It was discovered by German astronomer Wilhelm Tempel in 1882. It was also observed by French astronomer Guillaume Bigourdan on 15 April 1895 and listed in the Index Catalogue as IC 3833. NGC 4722 and NGC 4723 are listed together as Holm 471 in Erik Holmberg's A Study of Double and Multiple Galaxies Together with Inquiries into some General Metagalactic Problems, published in 1937.

NGC 4699 group According to A.M. Garcia, NGC 4722 is part of NGC 4699 Group (also known as LGG 307), which contains at least 15 galaxies, including NGC 4699, NGC 4700, NGC 4742, NGC 4781, NGC 4790, NGC 4802, and NGC 4818. The NGC 4699 group is part of the Virgo II cluster, a cluster located at the southern boundary of the Virgo Cluster. This cluster is part of the Virgo Supercluster.

Supernova One supernova has been observed in NGC 4722: SN 2024ablh (Type II, mag. 17.17) was discovered by the Automatic Learning for the Rapid Classification of Events (ALeRCE) on 18 November 2024.

See also List of NGC objects (4001–5000)

References

External links Media related to NGC 4722 at Wikimedia Commons NGC 4722 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 4722

Start with the simplest possible case. Write down what NGC 4722 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 4722 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 4722 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 4722

In research: NGC 4722 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 4722 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 4722 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1882, Corvus (constellation), Discoveries by Wilhelm Tempel, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 4722 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 4722 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 4722 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 4722 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 4722 in simple terms?

Why does NGC 4722 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 4722?

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 4722.