astronomy

NGC 2992

NGC 2992 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 2992 rather than just read about it. In short: NGC 2992 is a Seyfert galaxy located 103 million light years distant in the equatorial constellation of Hydra. It was discovered in 1785 by Anglo-German astronomer William Herschel.

Key takeaways

NGC 2992 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 2992 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 2992 from memory before moving on to harder problems.

Reference excerpt

NGC 2992 is a Seyfert galaxy located 103 million light years distant in the equatorial constellation of Hydra. It was discovered in 1785 by Anglo-German astronomer William Herschel. The morphological classification of this galaxy is Sa, indicating a spiral with no central bar. The plane of the galaxy is inclined at an angle of 70° to the line of sight from the Earth, so it is being viewed from nearly edge on. A prominent dust lane extends along the major axis, crossing the nucleus. This was identified as a Seyfert galaxy in 1980 based on a broad component of the Hα line with no matching Hβ broadening. It is classed as an intermediate Seyfert of type 1.9/1.5. Varying emission in the x-ray and other bands have been detected from the nucleus of NGC 2992, which may be the result of changes to an accretion disk in the core. These fluctuations show changes by a factor of up to 20 on a time scales of days or weeks. The mass of the central supermassive black hole is estimated to be 5.2×107 M☉. The nearby companion galaxy NGC 2993 is located less than 3′ to the southeast of NGC 2292. The two are linked by a tidal bridge of ionized hydrogen and there are tidal tails to the southeast of NGC 2993 and the north of NGC 2292. The encounter between these galaxies may be the trigger for the active nucleus in NGC 2992. There is a significant amount of dust obscuring the nucleus and cones of material outflowing from the core at nearly right angles to the alignment of the galaxy. NuSTAR observations suggest there is an ultra-fast outflow component with a velocity of 0.21±0.01 c.

References

External links Media related to NGC 2992 at Wikimedia Commons NGC 2992 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 2992

Start with the simplest possible case. Write down what NGC 2992 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 2992 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 2992 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 2992

In research: NGC 2992 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 2992 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 2992 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Galaxies discovered in 1785, Hydra (constellation), NGC objects, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 2992 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 2992 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 2992 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 2992 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 2992 in simple terms?

NGC 2992 is a Seyfert galaxy located 103 million light years distant in the equatorial constellation of Hydra. It was discovered in 1785 by Anglo-German astronomer William Herschel.

Why does NGC 2992 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 2992?

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 2992.