astronomy

NGC 4261

NGC 4261 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 4261 rather than just read about it. In short: NGC 4261 is an elliptical galaxy located around 100 million light-years away in the constellation Virgo. It was discovered by German-British astronomer William Herschel on April 13, 1784.

Key takeaways

NGC 4261 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 4261 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 4261 from memory before moving on to harder problems.

Reference excerpt

NGC 4261 is an elliptical galaxy located around 100 million light-years away in the constellation Virgo. It was discovered by German-British astronomer William Herschel on April 13, 1784. The galaxy is a member of its own somewhat meager galaxy group known as the NGC 4261 group, which is part of the Virgo Cluster. The morphological classification of this galaxy is E2, indicating an elliptical galaxy with a 5:4 ratio between the major and minor axes. The stellar population of the galaxy is old, showing no indications of recent mergers or interactions with other members of its group. Large-scale isophotes of the galaxy are generally boxy in form, with no markers that would suggest a disruptive interaction within the last billion years. There is a dust lane along the north–south axis of the galaxy and a disk of dust around the nucleus. Two prominent jets emanating from the nucleus can be observed in the radio band. It has an active galactic nucleus with a supermassive black hole somewhat offset from the center of the core. The black hole is estimated to have a mass of (1.62±0.04)×109 M☉. The galaxy is estimated to be about 60 thousand light-years across, and a jet emanating from it is estimated to span about 88 thousand light-years. A Type Ia supernova event in this galaxy was reported on January 1, 2001. It was designated SN 2001A, marking the first supernova discovery of the year. The position of the event was 3.1″ west and 10.7″ north of the galactic nucleus. It had reached magnitude 18.4 on December 15 of the previous year.

Gallery

See also List of NGC objects (4001–5000)

References

External links

Animation of the black hole in the center of NGC 4261

Illustrations

Worked examples

Example 1 — a first encounter with NGC 4261

Start with the simplest possible case. Write down what NGC 4261 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 4261 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 4261 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 4261

In research: NGC 4261 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 4261 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 4261 is common in secondary-school and first-year university syllabi. It links to neighbouring topics 3C objects, Elliptical galaxies, MCG objects, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 4261 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 4261 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 4261 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 4261 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 4261 in simple terms?

NGC 4261 is an elliptical galaxy located around 100 million light-years away in the constellation Virgo. It was discovered by German-British astronomer William Herschel on April 13, 1784.

Why does NGC 4261 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 4261?

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 4261.