astronomy

NGC 612

NGC 612 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 612 rather than just read about it. In short: NGC 612 is a large lenticular galaxy in the constellation of Sculptor located approximately 388 million light-years from Earth. It is a type II Seyfert galaxy with a diameter of 440,000 light-years across and thus has an active galactic nucleus.

Key takeaways

NGC 612 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 612 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 612 from memory before moving on to harder problems.

Reference excerpt

NGC 612 is a large lenticular galaxy in the constellation of Sculptor located approximately 388 million light-years from Earth. It is a type II Seyfert galaxy with a diameter of 440,000 light-years across and thus has an active galactic nucleus. NGC 612 has been identified as an extremely rare example of a non-elliptical radio galaxy, hosting one of the nearest powerful FR-II radio sources.

Observation history The object was discovered by British astronomer John Herschel on 29 November 1837. John Louis Emil Dreyer, compiler of the first New General Catalogue of Nebulae and Clusters of Stars, described NGC 612 as "faint, very small, round, 12th magnitude star to the west."

Physical characteristics

NGC 612 has a fairly well-developed luminous disc seen almost edge-on and features a strong dust ring. The disk features an unusually young star population with ages in the range ~0.04–0.1 Gyr. The galaxy is surrounded by an enormous disc of cool neutral hydrogen gas with a mass of 2.0×1010 M☉ distributed in a 140 kpc wide structure along the galactic disc and dust lane of NGC 612. The majority of the gas is relatively settled in regular rotation with a velocity of 850 km/s. NGC 612 is one of 5 (as of 2020) known lenticular galaxies that show large-scale radio emissions. Both spiral galaxies and lenticular galaxies rarely host large scale radio emissions. It is not understood why these types of galaxies are so rare. The supermassive black hole (SMBH) at the center of NGC 612, which powers the radio emission, has a mass with a lower limit of 3.2×109 M☉. A faint bridge, spanning 400 kpc, exists between NGC 612 and the gas-rich barred spiral galaxy NGC 619, indicating that an interaction between both galaxies occurred at some point. Current or past interaction, such as a merger event, is currently the most likely trigger of NGC 612's radio source.

See also NGC 4151 – another example of a non-elliptical radio galaxy List of galaxies

References

Illustrations

Worked examples

Example 1 — a first encounter with NGC 612

Start with the simplest possible case. Write down what NGC 612 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 612 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 612 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 612

In research: NGC 612 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 612 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 612 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1837, Discoveries by John Herschel, Lenticular galaxies, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 612 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 612 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 612 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 612 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 612 in simple terms?

Why does NGC 612 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 612?

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 612.