astronomy

Ijiraq (moon)

Ijiraq (moon) 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 Ijiraq (moon) rather than just read about it. In short: Ijiraq, or Saturn XXII, is a small prograde irregular satellite of Saturn. It was discovered by the team of Brett Gladman, John J.

Key takeaways

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

Reference excerpt

Ijiraq, or Saturn XXII, is a small prograde irregular satellite of Saturn. It was discovered by the team of Brett Gladman, John J. Kavelaars, et al. in 2000, and given the temporary designation S/2000 S 6. It was named in 2003 after the ijiraq, a creature in Inuit mythology.

Orbit

Ijiraq orbits Saturn at an average distance of 11.3 million km in 451 days on an orbit very similar to Kiviuq's. Ijiraq is believed to be in Kozai resonance: its orbit is cyclically reducing the inclination while increasing the eccentricity and vice versa. The orbital argument of pericenter oscillates around 90° with an amplitude of 60°. Like Kiviuq and Thrymr, Ijiraq's orbital elements overlap strongly with Phoebe's, and it is likely to collide with Phoebe in the future.

Physical characteristics While Ijiraq is a member of the Inuit group of irregular satellites, recent observations revealed that it is distinctively redder than Paaliaq, Siarnaq and Kiviuq. Its spectral slope (a measure of body reflectance in function of the wavelength) is twice as steep as that of other Inuit-group satellites (20% per 100 nm), typical for red trans-Neptunian objects like Sedna but unknown for irregular satellites. In addition, the Ijiraupian (Ijiraqan) spectrum lacks the weak absorption near 0.7 μm, attributed to a possible water hydration, found in the other three.

Name Ijiraq was named in 2003 after the ijiraq, a creature of Inuit mythology. Kavelaars, an astronomer at McMaster University, suggested this name to help astronomical nomenclature to get out of its Greco-Romano-Renaissance rut. He spent several months trying to find names that were both multi-cultural and Canadian, consulting Amerindian scholars without finding a name that seemed appropriate. In March 2001, he was reading an Inuit tale to his children and had a revelation. The ijiraq plays at hide-and-seek, which is what these small moons of Saturn do: they are hard to find, and cold like the Canadian arctic (the team of discoverers includes Canadians, Norwegians and Icelanders—nordicity is their common trait). Kavelaars contacted the author of the tale, Michael Kusugak, to get his assent, and the latter also suggested the names for Kiviuq and 90377 Sedna.

Notes

References

External links

Ephemeris from IAU-MPC NSES

Illustrations

Worked examples

Example 1 — a first encounter with Ijiraq (moon)

Start with the simplest possible case. Write down what Ijiraq (moon) 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 Ijiraq (moon) 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 Ijiraq (moon) 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 Ijiraq (moon)

In research: Ijiraq (moon) 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 Ijiraq (moon) 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: Ijiraq (moon) is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 2000, Discoveries by Brett J. Gladman, Inuit group, so understanding it makes those chapters shorter.
In everyday life: Look for Ijiraq (moon) 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 Ijiraq (moon) in 20 minutes

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

Frequently asked questions

What is Ijiraq (moon) in simple terms?

Ijiraq, or Saturn XXII, is a small prograde irregular satellite of Saturn. It was discovered by the team of Brett Gladman, John J.

Why does Ijiraq (moon) 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 Ijiraq (moon)?

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 Ijiraq (moon).