science

USA-319

USA-319 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-319 rather than just read about it. In short: USA-319, also known as GPS-III SV05, NAVSTAR 81 or Neil Armstrong, is a United States navigation satellite which forms part of the Global Positioning System. It was the fifth GPS Block III satellite to be launched.

Key takeaways

USA-319 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-319 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of USA-319 from memory before moving on to harder problems.

Reference excerpt

USA-319, also known as GPS-III SV05, NAVSTAR 81 or Neil Armstrong, is a United States navigation satellite which forms part of the Global Positioning System. It was the fifth GPS Block III satellite to be launched.

Satellite

SV05 is the fifth GPS Block III satellite. Satellite construction was completed in early 2021. The spacecraft is built on the Lockheed Martin A2100 satellite bus, and weighs approximately 4,331 kg (9,548 lb). SV05 is the 24th operational Military Code (M-Code) satellite to join the GPS constellation, the last required for M-Code Full Operational Capability.

Launch USA-319 was launched by SpaceX on 17 June 2021 at 16:09 UTC, atop Falcon 9 booster B1062. This booster had previously launched SV04 a year prior. The launch took place from SLC-40 at Cape Canaveral Space Force Station, and placed USA-319 directly into semi-synchronous orbit. About eight minutes after launch, Falcon 9 successfully landed on the droneship Just Read the Instructions.

Orbit As of 2023, USA-319 was in a 55.3 degree inclination orbit with a perigee of 20,163 kilometers (12,529 mi) and an apogee of 20,216 km (12,562 mi).

References

Illustrations

Worked examples

Example 1 — a first encounter with USA-319

Start with the simplest possible case. Write down what USA-319 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-319 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-319 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-319

In research: USA-319 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-319 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-319 is common in secondary-school and first-year university syllabi. It links to neighbouring topics GPS satellites, SpaceX military payloads, Spacecraft launched by Falcon 9 Block 5 rockets, so understanding it makes those chapters shorter.
In everyday life: Look for USA-319 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-319 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what USA-319 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 USA-319 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is USA-319 in simple terms?

Why does USA-319 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-319?

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-319.