astronomy

NGC 7212

NGC 7212 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 7212 rather than just read about it. In short: NGC 7212 is a spiral galaxy located in the constellation Pegasus. It is about 369 million light-years from Earth.

Key takeaways

NGC 7212 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 7212 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 7212 from memory before moving on to harder problems.

Reference excerpt

NGC 7212 is a spiral galaxy located in the constellation Pegasus. It is about 369 million light-years from Earth. It was discovered on October 2, 1886, by the astronomer Lewis A. Swift. It is also classified as a Seyfert galaxy and such contains an extended emission-line region (EELR).

Description NGC 7212 is classified to be part of an interacting system of three galaxies, of which two are of them are found to be merging together. The nucleus is found active and it has been categorized as a Seyfert galaxy of Type 2 based on the discovery of weak hydrogen beta emission lines. A study published in February 1995, has found it has a presence of a jet-like feature being shown as both ionized and extended from the nucleus region by around 10 arcseconds, with an orientation of 170°. In 2020, X-ray emission was found in NGC 7212 by Chandra X-ray Observatory. When observed, the emission is described as extended on kiloparsec scales and diffused, with 20% of it being located outside of the central radius. Imaging with Hubble Space Telescope (HST), also found there are also detections of doubly ionized oxygen emission mainly made up of several blob components located both north and south from the nucleus.

Galaxy Triplet

NGC 7212 is part of a triplet of galaxies, at the center of which it lies. The galaxy to the northeast is PGC 6728403. The second, located to the southwest, is 2MASS J22070015+1013286. The first two galaxies show clear signs of gravitational interaction. As for the third, further south, its distance from Hubble remains unknown, and it may well be a background galaxy

Supermassive black hole A study conducted in 2007 with 90 Seyfert 2-type galaxies using velocity dispersion allowed scientists to estimate the mass of their central supermassive black holes. For NGC 7212, the mass of the black hole is equal to 30 × 106 M☉. According to an article published in 2012, Several studies of velocity dispersion in the central region have allowed its mass to be estimated at 3.2 × 107 M☉.

References

Illustrations

Worked examples

Example 1 — a first encounter with NGC 7212

Start with the simplest possible case. Write down what NGC 7212 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 7212 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 7212 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 7212

In research: NGC 7212 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 7212 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 7212 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Active galaxies, Astronomical objects discovered in 1886, Discoveries by Lewis Swift, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 7212 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 7212 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 7212 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 7212 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 7212 in simple terms?

NGC 7212 is a spiral galaxy located in the constellation Pegasus. It is about 369 million light-years from Earth.

Why does NGC 7212 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 7212?

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 7212.