astronomy

NGC 1543

NGC 1543 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 1543 rather than just read about it. In short: NGC 1543 is a barred lenticular galaxy in the constellation Reticulum. The galaxy lies about 55 million light years away from Earth, which means, given its apparent dimensions, that NGC 1543 is approximately 100,000 light years across.

Key takeaways

NGC 1543 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 1543 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 1543 from memory before moving on to harder problems.

Reference excerpt

NGC 1543 is a barred lenticular galaxy in the constellation Reticulum. The galaxy lies about 55 million light years away from Earth, which means, given its apparent dimensions, that NGC 1543 is approximately 100,000 light years across. It was discovered by James Dunlop on November 5, 1826. It is a member of the Dorado Group.

Characteristics The galaxy is seen nearly face on. NGC 1543 features a double bar. The inner bar has a length of 23 arcseconds, with its major axis at 30° northeast angle, while the main bar is about 2.3 arcminutes and lies along an east-west axis. There is H-alpha emission from the centre of the galaxy. The nucleus appears to have undergone a star formation event 2 to 5 billion years ago. However the stars in the bulge and the disk are old. Another prominent feature of the galaxy is the outer ring, which is more visible in the near ultraviolet than optical wavelengths. Its radius is estimated to be 160 arcseconds. The ring was also detected in the hydrogen line, while the rest of the galaxy appears devoid of hydrogen. The total hydrogen mass of the galaxy is estimated to be (9±0.9)×108 M☉. The ring could have formed by the galaxy colliding with a dwarf galaxy while passing through the central region of the galaxy group. HII regions in the southeastern part of the ring emit ultraviolet and H-alpha, indicating active star formation. Star formation is also observed at the northwest part of the ring. The star formation rate at the ring is estimated to be about 0.08 solar masses per year based on the ultraviolet radiation detected and this rate was constant the last hundred million years.

Nearby galaxies NGC 1543 is a member of the Dorado Group. The galaxy lies at the outskirts of the group, about 1.2 kiloparsecs from the center of the group, where NGC 1553 is located, and is relatively isolated. No extended hydrogen emission was found, indicating the galaxy isn't currently interacting.

References

External links

NGC 1543 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 1543

Start with the simplest possible case. Write down what NGC 1543 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 1543 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 1543 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 1543

In research: NGC 1543 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 1543 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 1543 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1826, Barred lenticular galaxies, Discoveries by James Dunlop, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 1543 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 1543 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 1543 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 1543 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 1543 in simple terms?

Why does NGC 1543 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 1543?

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 1543.