astronomy

NGC 5584

NGC 5584 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 5584 rather than just read about it. In short: NGC 5584 is a barred spiral galaxy in the constellation Virgo. It was discovered July 27, 1881 by American astronomer E.

Key takeaways

NGC 5584 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 5584 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 5584 from memory before moving on to harder problems.

Reference excerpt

NGC 5584 is a barred spiral galaxy in the constellation Virgo. It was discovered July 27, 1881 by American astronomer E. E. Barnard. Distance determination using Cepheid variable measurements gives an estimate of 75 million light years, whereas the tip of the red-giant branch approach yields a distance of 73.4 million light years. It is receding with a heliocentric radial velocity of 1,637 km/s. It is a member of the Virgo III Groups, a series of galaxies and galaxy clusters strung out to the east of the Virgo Supercluster of galaxies. The morphological class of NGC 5584 is SAB(rs)cd, which indicates this spiral galaxy has an inner bar (SAB), an incomplete inner ring structure (rs), and loosely wound spiral arms (cd). It is flocculent in appearance with only a small nucleus. Star formation is occurring along the spiral arms. The galactic plane is inclined at an angle of 42.4° to the line of sight from the Earth, and it spans more than 50,000 light-years across. 250 Cepheid variables have been observed in NGC 5584.

Supernovae Two supernovae have been observed in NGC 5584:

SN 1996aq (Type Ic, mag. 15.7) was discovered by Masakatsu Aoki on 17 August 1996. It was offset by 15″ west and 8″ south of the galactic center. It reached magnitude 14.7 on August 18. SN 2007af (type Ia, mag. 15.4) was discovered by Kōichi Itagaki on 24 February 2007, located at an offset 40″ west and 22″ of the galaxy's center. A light echo of this event was observed about 1,000 days after its discovery.

References

External links Media related to NGC 5584 at Wikimedia Commons Spiral Key to Universe's Expansion: ESA/Hubble Picture of the week.

Illustrations

Worked examples

Example 1 — a first encounter with NGC 5584

Start with the simplest possible case. Write down what NGC 5584 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 5584 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 5584 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 5584

In research: NGC 5584 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 5584 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 5584 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Barred spiral galaxies, NGC objects, Principal Galaxies Catalogue objects, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 5584 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 5584 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 5584 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 5584 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 5584 in simple terms?

NGC 5584 is a barred spiral galaxy in the constellation Virgo. It was discovered July 27, 1881 by American astronomer E.

Why does NGC 5584 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 5584?

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 5584.