astronomy

NGC 1404

NGC 1404 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 1404 rather than just read about it. In short: NGC 1404 is an elliptical galaxy in the Southern constellation Eridanus. It was discovered by British astronomer John Herschel on November 28, 1837.

Key takeaways

NGC 1404 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 1404 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 1404 from memory before moving on to harder problems.

Reference excerpt

NGC 1404 is an elliptical galaxy in the Southern constellation Eridanus. It was discovered by British astronomer John Herschel on November 28, 1837. Based on the tip of the red-giant branch distance indicator, it lies at a distance of approximately 60 million light-years from the Milky Way. It is one of the brightest members of the Fornax Cluster.

Characteristics As usual with most elliptical galaxies, NGC 1404 is rich in globular clusters, with a population of them that has been estimated to be around 725; however it has been proposed it could have lost most of its globular clusters due to gravitational interactions with NGC 1399, the brightest galaxy of the Fornax Cluster. Studies using the X-ray telescope Chandra show how the ram-pressure stripping caused by the motion of NGC 1404 through Fornax' intracluster medium is stripping the galaxy of its hot gas, leaving behind a large trail.

Supernovae Two supernovae have been observed in NGC 1404:

SN 2007on (Type Ia, mag. 14.9) was discovered by Christian Pollas and the TAROT collaboration on 5 November 2007. SN 2011iv (Type Ia, mag. 12.8) was discovered by Stuart Parker on 2 December 2011.

Gallery

References

External links Media related to NGC 1404 at Wikimedia Commons NGC 1404 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 1404

Start with the simplest possible case. Write down what NGC 1404 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 1404 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 1404 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 1404

In research: NGC 1404 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 1404 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 1404 is common in secondary-school and first-year university syllabi. It links to neighbouring topics ESO objects, Elliptical galaxies, Eridanus (constellation), so understanding it makes those chapters shorter.
In everyday life: Look for NGC 1404 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 1404 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 1404 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 1404 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 1404 in simple terms?

NGC 1404 is an elliptical galaxy in the Southern constellation Eridanus. It was discovered by British astronomer John Herschel on November 28, 1837.

Why does NGC 1404 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 1404?

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 1404.