astronomy

Skynet 5D

Skynet 5D 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 5D rather than just read about it. In short: Skynet 5D is a military communications satellite operated by Airbus Defence and Space on behalf of the British Ministry of Defence. It was the last of four Skynet 5 satellites to be launched.

Key takeaways

Skynet 5D 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 5D to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Skynet 5D from memory before moving on to harder problems.

Reference excerpt

Skynet 5D is a military communications satellite operated by Airbus Defence and Space on behalf of the British Ministry of Defence. It was the last of four Skynet 5 satellites to be launched.

Spacecraft The Skynet 5D spacecraft was constructed by Astrium, based on the Eurostar 3000S satellite bus. It had a mass at launch of approximately 4,800 kilograms (10,600 lb), and is designed to operate for at least 15 years. Its 34-metre (112 ft) solar arrays will generate a minimum of 6 kilowatts to power its UHF and X-band communications systems. The satellite's payload includes jamming countermeasures. The Ministry of Defence described the satellite as having a "key role in gathering intelligence on operations", as well as communications.

Launch Skynet 5D was launched by an Ariane 5ECA carrier rocket flying from ELA-3 at Kourou. The launch occurred at 21:49 UTC on 19 December 2012. Skynet 5D was one of two satellites aboard the rocket, the other being Mexsat Bicentenario, which was located below it; Skynet 5D was mounted atop a Sylda 5 adaptor.

Orbit The launch placed Skynet 5D into a geosynchronous transfer orbit, from which was planned to raise itself into geostationary orbit. The spacecraft was expected to be placed at a longitude of 25 degrees East.

References

Illustrations

Worked examples

Example 1 — a first encounter with Skynet 5D

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

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

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

Frequently asked questions

What is Skynet 5D in simple terms?

Skynet 5D is a military communications satellite operated by Airbus Defence and Space on behalf of the British Ministry of Defence. It was the last of four Skynet 5 satellites to be launched.

Why does Skynet 5D 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 5D?

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 5D.