astronomy

NGC 1357

NGC 1357 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 1357 rather than just read about it. In short: NGC 1357 is an isolated spiral galaxy situated in constellation of Eridanus. Located about 92 million light years away, it is a member of the Eridanus Cluster of galaxies, a cluster of about 200 galaxies, being the farthest known member.

Key takeaways

NGC 1357 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 1357 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 1357 from memory before moving on to harder problems.

Reference excerpt

NGC 1357 is an isolated spiral galaxy situated in constellation of Eridanus. Located about 92 million light years away, it is a member of the Eridanus Cluster of galaxies, a cluster of about 200 galaxies, being the farthest known member. Based on location and distance, NGC 1357 is located at the very edge on the Eridanus Cluster. It was discovered by William Herschel on February 1, 1785.

Characteristics NGC 1357 has a Hubble classification of Sab, which indicates it is a spiral galaxy with no bar. It is moving away from the Milky Way at a rate of 2,018 km/s. Its size on the night sky is 3.2' x 2.4' which is proportional to its real size of the 85 000 ly. NGC 1357's surface brightness profile shows a small bulge and a large, fairly exponential disk. However, the automatic bulge-disk fit would give an unreliably large bulge extending through the whole galaxy (lowermost row). A more reasonable fit is obtained by adding another exponential disk component to the inner part of the galaxy (upper profile). This inner component corresponds to the region of tightly wound spiral arms with higher surface brightness. Analysis of the NGC 1357's spectra revealed the ionised calcium.

References

External links Media related to NGC 1357 at Wikimedia Commons

Illustrations

Worked examples

Example 1 — a first encounter with NGC 1357

Start with the simplest possible case. Write down what NGC 1357 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 1357 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 1357 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 1357

In research: NGC 1357 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 1357 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 1357 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Eridanus (constellation), Eridanus Group, NGC objects, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 1357 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 1357 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 1357 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 1357 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 1357 in simple terms?

Why does NGC 1357 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 1357?

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 1357.