astronomy

Skynet 5C

Skynet 5C 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 Skynet 5C rather than just read about it. In short: Skynet 5C is the third of four Skynet 5 military communications satellites to be used by the British Ministry of Defence (MOD). Launch It was launched from French Guiana aboard an Ariane 5ECA carrier rocket at 22:05:02 GMT on 12 June 2008.

Key takeaways

Skynet 5C belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Skynet 5C to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Skynet 5C from memory before moving on to harder problems.

Reference excerpt

Skynet 5C is the third of four Skynet 5 military communications satellites to be used by the British Ministry of Defence (MOD).

Launch It was launched from French Guiana aboard an Ariane 5ECA carrier rocket at 22:05:02 GMT on 12 June 2008. The launch was originally scheduled for 23 May, but was delayed to 30 May, and then delayed again due to software problems with the carrier rocket. Originally built as a ground spare satellite, the decision to launch was made in 2007. Arianespace provided launch services.

Spacecraft It was constructed by EADS Astrium under a contract to its subsidiary company Paradigm Secure Communications, who will operate the satellite on behalf of the MoD. Based on the Eurostar E3000 satellite bus, it has a mass of 4,700 kilograms, and an expected on-orbit lifetime of 15 years. Skynet 5C is part of a constellation of communications satellites for the United Kingdom Ministry of Defense that supports nuclear hardened and protected military X-band and UHF frequency capabilities. Skynet 5C is located at 17.8 degrees West.

References

Illustrations

Worked examples

Example 1 — a first encounter with Skynet 5C

Start with the simplest possible case. Write down what Skynet 5C 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 Skynet 5C 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 Skynet 5C 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 Skynet 5C

In research: Skynet 5C 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 Skynet 5C 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: Skynet 5C is common in secondary-school and first-year university syllabi. It links to neighbouring topics Communications satellite stubs, Communications satellites in geostationary orbit, European spacecraft stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Skynet 5C 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 Skynet 5C in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Skynet 5C 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 Skynet 5C out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Skynet 5C in simple terms?

Skynet 5C is the third of four Skynet 5 military communications satellites to be used by the British Ministry of Defence (MOD). Launch It was launched from French Guiana aboard an Ariane 5ECA carrier rocket at 22:05:02 GMT on 12 June 2008.

Why does Skynet 5C 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 Skynet 5C?

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 Skynet 5C.