astronomy

IC 1166

IC 1166 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 IC 1166 rather than just read about it. In short: IC 1166 are a pair of galaxies in the Corona Borealis constellation comprising IC 1166 NED01 and IC 1166 NED02. They are located 977 million light-years from the Solar System and were discovered on July 28, 1892, by Stephane Javelle.

Key takeaways

IC 1166 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect IC 1166 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of IC 1166 from memory before moving on to harder problems.

Reference excerpt

IC 1166 are a pair of galaxies in the Corona Borealis constellation comprising IC 1166 NED01 and IC 1166 NED02. They are located 977 million light-years from the Solar System and were discovered on July 28, 1892, by Stephane Javelle.

Galaxies IC 1166 NED01 IC 1166 NED01 or PGC 56771 is a type E elliptical galaxy. Located above IC 1166 NED02, it has a diameter of approximately 110,000 light-years. PGC 56771 has an active nucleus and it is classified as a Seyfert type 1 galaxy. It has a quasar-like appearance, but its host clearly seen and presents two sets of emission lines which are superimposed on each other. PGC 56771 is classified a Markarian galaxy (designated Mrk 867), because compared to other galaxies its nucleus emits excessive amounts of ultraviolet rays. It has a surface brightness of 23.2 magnitude and, located at right ascension (16:02:08.92) and declination (26:19:45.60) respectively. IC 1166 NED02 IC 1166 NED02 or PGC 1771884 is a type SBbc spiral galaxy. Located below IC 1166 NED01, it has an approximate diameter of 160,000 light-years making it slightly larger compared to the other galaxy and does not have an active galactic nucleus. PGC 1771884 has a surface brightness of 23.4 magnitude and, a right ascension of (16:02:08.83) and declination (26:19:31.20).

References

Illustrations

Worked examples

Example 1 — a first encounter with IC 1166

Start with the simplest possible case. Write down what IC 1166 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 IC 1166 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 IC 1166 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 IC 1166

In research: IC 1166 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 IC 1166 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: IC 1166 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1892, Corona Borealis, Elliptical galaxies, so understanding it makes those chapters shorter.
In everyday life: Look for IC 1166 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 IC 1166 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what IC 1166 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 IC 1166 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is IC 1166 in simple terms?

Why does IC 1166 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 IC 1166?

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 IC 1166.