astronomy

IC 883

IC 883 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 883 rather than just read about it. In short: IC 883 (also known as Arp 193, IRAS 13183+3423, PGC 46560 and UGC 8387) is an irregular galaxy that is about 321 million light years away from Earth. It is located in the constellation Canes Venatici.

Key takeaways

IC 883 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 883 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of IC 883 from memory before moving on to harder problems.

Reference excerpt

IC 883 (also known as Arp 193, IRAS 13183+3423, PGC 46560 and UGC 8387) is an irregular galaxy that is about 321 million light years away from Earth. It is located in the constellation Canes Venatici. Its largest radius is 1.4 (131 thousand light years), and smallest 0.7 angular minutes (65 thousand light years).[b] It was discovered by Rudolf Ferdinand Spitaler on May 1, 1891. IC 883 is classified a luminous infrared galaxy (LIRG). It is a recent merger given that the galaxy has one single nucleus and two tidal tails. The molecular gas measured in IC 883 is estimated 4 billion MΘ. It is known to show a radio jet originating from its nucleus travelling at a subluminal motion of 0.6-1 c.

Supernovae Two supernovae have been observed in IC 883:

SN 2010cu (Type II, mag. 17.7) was discovered by S. Mattila and E. Kankare on 24 February 2010. SN 2011hi (Type II, mag. 17.9) was discovered by E. Kankare, S. Ryder, and S. Mattila on 11 February 2011. When observed in near-infrared or optical wavelengths, they are the nearest supernovae found to the nucleus of an LIRG.

References

Literature

External links

NASA Astronomy Picture of the Day: When Mice Collide (12 June 2004) The Mice Galaxies Photographic Catalogue of Deep Sky Objects in Canes Venatici

Illustrations

Worked examples

Example 1 — a first encounter with IC 883

Start with the simplest possible case. Write down what IC 883 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 883 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 883 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 883

In research: IC 883 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 883 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 883 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Arp objects, Astronomical objects discovered in 1891, Canes Venatici, so understanding it makes those chapters shorter.
In everyday life: Look for IC 883 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 883 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what IC 883 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 883 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is IC 883 in simple terms?

Why does IC 883 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 883?

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 883.