astronomy

NGC 5778

NGC 5778 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 5778 rather than just read about it. In short: NGC 5778 is a large elliptical galaxy in the constellation of Boötes. The galaxy has a redshift of (z) 0.059 and it was first discovered by the American astronomer Lewis Swift in June 1886 who depicted it as faint and small, next to a star, and also discovered by the French astronomer Guillaume Bigourdan in May 1890.

Key takeaways

NGC 5778 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 5778 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 5778 from memory before moving on to harder problems.

Reference excerpt

NGC 5778 is a large elliptical galaxy in the constellation of Boötes. The galaxy has a redshift of (z) 0.059 and it was first discovered by the American astronomer Lewis Swift in June 1886 who depicted it as faint and small, next to a star, and also discovered by the French astronomer Guillaume Bigourdan in May 1890. It is the brightest cluster galaxy (BCG) of the galaxy cluster, Abell 1991 and as such dominates the center.

Description NGC 5778 is a type-cD galaxy of Abell 1991. It is a radio galaxy containing a compact central radio source with a low radio power of 23.41 W Hz−1 and a total radio flux density estimated as 38 mJy based on observations made with the Very Large Array (VLA). It also contains a core-jet structure based on a high resolution radio map with a linear size of 8 kiloparsecs. A radio core has been detected and has a total flux density of 11.4 mJy. The optical spectrum of the galaxy displays emission lines. The U – R and U – I color gradients of the galaxy are estimated to be -0.35 ± 0.06 and -0.23 ± 0.08 magnitudes respectively. The X-ray emission extends outwards by 180 arcseconds, with further detections of X-ray knot features located in the northern direction from its nucleus. The galaxy also has a calculated central velocity dispersion of 222 ± 8 kilometers per second with a total star formation rate that is less than 1.66 M☉ per year derived from its infrared luminosity. The stellar velocity dispersion is 279 ± 25 kilometers per second.

References

External links NGC 5778 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 5778

Start with the simplest possible case. Write down what NGC 5778 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 5778 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 5778 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 5778

In research: NGC 5778 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 5778 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 5778 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Active galaxies, Astronomical objects discovered in 1886, Boötes, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 5778 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.

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study NGC 5778 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 5778 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 5778 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 5778 in simple terms?

Why does NGC 5778 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 5778?

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 5778.