astronomy

NGC 2559

NGC 2559 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 2559 rather than just read about it. In short: NGC 2559 is a barred spiral galaxy in the constellation Puppis. The galaxy lies about 60 million light years away from Earth based on redshift independent methods, which means, given its apparent dimensions, that NGC 2559 is approximately 90,000 light years across.

Key takeaways

NGC 2559 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 2559 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 2559 from memory before moving on to harder problems.

Reference excerpt

NGC 2559 is a barred spiral galaxy in the constellation Puppis. The galaxy lies about 60 million light years away from Earth based on redshift independent methods, which means, given its apparent dimensions, that NGC 2559 is approximately 90,000 light years across. It was discovered by John Herschel on February 5, 1837.

Characteristics The galaxy has a bar and a small elliptical bulge, which is obstructed by large amounts of dust. From the end of the bar emerge two spiral arms with several knots and twists. The east arm has more bright knots than the west one. The position angle of the galaxy is variable, which is centrally at a north-south axis and rotates to northeast-southwest peripherally. The outer arms of the galaxy are faint. The galaxy extends to 6.6 arcminutes when its fainter extremities are considered, which corresponds to 110,000 light years. In the centre of the galaxy lies a supermassive black hole, whose mass is estimated to be 106.64 ± 0.97 (0.5 - 37 million) M☉, based on the pitch angle of the spiral arms. The star formation rate of the galaxy is estimated to be 3 M☉ per year.

Supernova One supernova has been observed in NGC 2559, SN 2002hc. The supernova was detected by Katzman Automatic Imaging Telescope on 24 October 2002, at an apparent magnitude of 17. The spectrum showed it was a Type II supernova.

Nearby galaxies NGC 2559 is the foremost galaxy in the NGC 2559 group, which also includes NGC 2566, and IC 2311. There is a possible companion galaxy to NGC 2559 4 arcminutes to the east. The group is noted for containing many hydrogen deficient galaxies. Other nearby galaxies include NGC 2613 and ESO 563-13. It is part of the Puppis Wall, which connects the Antlia Cluster with the Fornax Cluster.

References

External links

NGC 2559 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 2559

Start with the simplest possible case. Write down what NGC 2559 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 2559 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 2559 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 2559

In research: NGC 2559 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 2559 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 2559 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1837, Barred spiral galaxies, Discoveries by John Herschel, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 2559 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 2559 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 2559 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 2559 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 2559 in simple terms?

Why does NGC 2559 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 2559?

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 2559.