astronomy

NGC 7806

NGC 7806 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 7806 rather than just read about it. In short: NGC 7806 is an unbarred spiral galaxy located in the constellation Pegasus. It is located at a distance of about 225 million light years from Earth, which, given its apparent dimensions, means that NGC 7806 is about 80,000 light years across.

Key takeaways

NGC 7806 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 7806 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 7806 from memory before moving on to harder problems.

Reference excerpt

NGC 7806 is an unbarred spiral galaxy located in the constellation Pegasus. It is located at a distance of about 225 million light years from Earth, which, given its apparent dimensions, means that NGC 7806 is about 80,000 light years across. It was discovered by William Herschel on October 9, 1790. It forms a pair with NGC 7805 and is included in the Atlas of Peculiar Galaxies in the elliptical and elliptical-like galaxies repelling spiral arms section. NGC 7806 formes a triplet with the elliptical galaxy NGC 7805 to the southwest and faint arc-shaped galaxy KUG 2359-311 towards the west. A faint tail seems to connect NGC 7806 with KUG 2359–311 to the south and maybe to the north. NGC 7806 also has a tidal tail which extends towards the north and contains two ultraviolet clumps. The hydrogen in the galaxy is off-center and towards the north of the galaxy. This asymmetry is the result of strong interaction. The total HI mass is estimated to be 1.4×109 M☉. At the northern half of the disk features star forming regions which emit H-alpha, matching both the ultraviolet and hydrogen line emissions, and star formation was likely triggered by the interaction with NGC 7805. The total star formation rate of the galaxy is estimated to be 0.06 M☉ per year. According to A.M. Garcia, NGC 7806 is a member of the NGC 7831 group (also known as LGG 1), which contains at least 18 galaxies, including NGC 13, NGC 19, NGC 20, NGC 21, NGC 39, NGC 43, NGC 7819, and NGC 7836.

Gallery

References

External links

NGC 7806 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images NGC 7806 on SIMBAD

Illustrations

Worked examples

Example 1 — a first encounter with NGC 7806

Start with the simplest possible case. Write down what NGC 7806 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 7806 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 7806 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 7806

In research: NGC 7806 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 7806 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 7806 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Arp objects, Astronomical objects discovered in 1790, Discoveries by William Herschel, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 7806 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 7806 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 7806 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 7806 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 7806 in simple terms?

Why does NGC 7806 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 7806?

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 7806.