astronomy

NGC 5173

NGC 5173 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 5173 rather than just read about it. In short: NGC 5173 is a peculiar elliptical galaxy in the northern constellation of Canes Venatici. It was discovered May 12, 1787 by German-British astronomer William Herschel.

Key takeaways

NGC 5173 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 5173 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 5173 from memory before moving on to harder problems.

Reference excerpt

NGC 5173 is a peculiar elliptical galaxy in the northern constellation of Canes Venatici. It was discovered May 12, 1787 by German-British astronomer William Herschel. This galaxy has an apparent visual magnitude of 12.2, and spans an angular size of 1.2′ × 1.1′. It is the second brightest member of a small group of galaxies, with the brightest being NGC 5198; it lies at the eastern edge of its group. NGC 5171 is separated from the nearby Sb galaxy NGC 5169 by just 5.5′, and they have a velocity difference of 17 km/s. Originally, this was classified by de Vaucouleurs as an elliptical galaxy, having a morphological classification of E0: which indicates a spherically-symmetric shape. In 1984, neutral hydrogen gas was discovered in NGC 5171, with a mass estimated at ~109 M☉ being about double that of gas-rich ellipticals. Observations reported in 1991 showed the presence of a star-forming spiral structure located off-center from the galaxy isophotes. This may be the remnant of an accreted galaxy similar to the Large Magellanic Cloud, with at least 10–20% of the original galaxy's mass. The disk has a radial extent of about 3.5 to 9.5 kpc. Massive clusters have formed in this disk over the last 400 Myr. Observations with the Hubble Space Telescope show filamentary structures at the center of the galaxy.

References

Illustrations

Worked examples

Example 1 — a first encounter with NGC 5173

Start with the simplest possible case. Write down what NGC 5173 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 5173 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 5173 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 5173

In research: NGC 5173 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 5173 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 5173 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Canes Venatici, Elliptical galaxies, NGC objects, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 5173 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 5173 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 5173 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 5173 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 5173 in simple terms?

NGC 5173 is a peculiar elliptical galaxy in the northern constellation of Canes Venatici. It was discovered May 12, 1787 by German-British astronomer William Herschel.

Why does NGC 5173 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 5173?

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 5173.