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USA-177

USA-177 is a science 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 USA-177 rather than just read about it. In short: USA-177, also known as GPS IIR-11 and GPS SVN-59, is an American navigation satellite which forms part of the Global Positioning System. It was the eleventh Block IIR GPS satellite to be launched, out of thirteen in the original configuration, and twenty one overall.

USA-177 — main illustration
USA-177 — illustration

Key takeaways

  • USA-177 belongs to science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect USA-177 to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of USA-177 from memory before moving on to harder problems.

Reference excerpt

USA-177, also known as GPS IIR-11 and GPS SVN-59, is an American navigation satellite which forms part of the Global Positioning System. It was the eleventh Block IIR GPS satellite to be launched, out of thirteen in the original configuration, and twenty one overall. It was built by Lockheed Martin, using the AS-4000 satellite bus. USA-177 was launched at 17:53:00 UTC on 20 March 2004, atop a Delta II carrier rocket, flight number D303, flying in the 7925-9.5 configuration. The launch took place from Space Launch Complex 17B at the Cape Canaveral Air Force Station, and placed USA-177 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-37FM apogee motor. By 20 May 2004, USA-177 was in an orbit with a perigee of 20,095 kilometres (12,486 mi), an apogee of 20,271 kilometres (12,596 mi), a period of 718 minutes, and 55 degrees of inclination to the equator. It is used to broadcast the PRN 19 signal, and operates in slot 3 of plane C of the GPS constellation. The satellite has a mass of 2,032 kilograms (4,480 lb), and a design life of 10 years. As of 2012 it remains in service.

References

Illustrations

USA-177 illustration

Worked examples

Example 1 — a first encounter with USA-177

Start with the simplest possible case. Write down what USA-177 claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 USA-177 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 USA-177 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 USA-177

In research
USA-177 appears in science 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 USA-177 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
USA-177 is common in secondary-school and first-year university syllabi. It links to neighbouring topics American spacecraft stubs, GPS satellites, Spacecraft launched in 2004, so understanding it makes those chapters shorter.
In everyday life
Look for USA-177 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 USA-177 in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what USA-177 means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain USA-177 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is USA-177 in simple terms?

USA-177, also known as GPS IIR-11 and GPS SVN-59, is an American navigation satellite which forms part of the Global Positioning System. It was the eleventh Block IIR GPS satellite to be launched, out of thirteen in the original configuration, and twenty one overall.

Why does USA-177 matter?

Because it connects several science 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 USA-177?

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 USA-177.

Tags

  • American spacecraft stubs
  • GPS satellites
  • Spacecraft launched in 2004
  • USA satellites

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