astronomy

NGC 7412

NGC 7412 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 7412 rather than just read about it. In short: NGC 7412 is a spiral galaxy in the constellation Grus. The galaxy lies about 35 million light years away from Earth based on redshift independent methods, which means, given its apparent dimensions, that NGC 7412 is approximately 40,000 light years across.

Key takeaways

NGC 7412 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 7412 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 7412 from memory before moving on to harder problems.

Reference excerpt

NGC 7412 is a spiral galaxy in the constellation Grus. The galaxy lies about 35 million light years away from Earth based on redshift independent methods, which means, given its apparent dimensions, that NGC 7412 is approximately 40,000 light years across. However, based on redshift the galaxy lies about 80 million light years away. It was discovered by John Herschel on September 2, 1836. NGC 7412 is characterised as an intermediate spiral galaxy, meaning it has a weak bar embedded in its bulge. The bulge is small and lies in a smooth inner disk. The galaxy has two well defined arms in a grand design pattern. The inner part of the north arm appears complex. After about 60° of revolution the arm splits in two, with the higher surface brightness branc being more tightly wound. Both branches can be traced for about a quarter of a revolution. The south arm also splits in two, after about 60° of revolution. The inner branch is of higher surface brightness and can be traced for about 150° of revolution while the outer branch fades after about 60°. Star formation regions are visible at the outer branch. A dust lane runs across the brighter parts of each arm. HII regions are visible, but are smaller than 1.5 arcseconds across. The hydrogen disk of the galaxy extends beyond the optical one. The total hydrogen mass is estimated to be 109.46 M☉. The outer regions of the galaxy appear warped, probably due to an interaction with another galaxy. The color of the nucleus indicates it hosts intermediate age stars, without active starburst activity, surrounded by the older stars of the bulge. NGC 7412 is a member of the IC 5267 Group, also known as LGG 464. Other members of the group include IC 5267, after which the group is named, IC 5267A, and IC 5267B. This group, along with the groups centred around IC 1459 and NGC 7582, form the Grus cloud, a region of elevated galaxy density. The Grus cloud, along with the nearby Pavo-Indus cloud, lies between the Local Supercluster and Pavo–Indus Supercluster.

References

External links

NGC 7412 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 7412

Start with the simplest possible case. Write down what NGC 7412 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 7412 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 7412 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 7412

In research: NGC 7412 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 7412 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 7412 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1836, Discoveries by John Herschel, Grus (constellation), so understanding it makes those chapters shorter.
In everyday life: Look for NGC 7412 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.

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study NGC 7412 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 7412 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 7412 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 7412 in simple terms?

Why does NGC 7412 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 7412?

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 7412.