astronomy

Luch 5A

Luch 5A 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 Luch 5A rather than just read about it. In short: Luch 5A (Russian: Луч-5А meaning ray and sometimes transliterated as Loutch-5A) is a Russian Luch relay satellite which transmits data from the Russian Orbital Segment of the International Space Station, and from other satellites in low Earth orbit. It is in geosynchronous orbit.

Key takeaways

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

Reference excerpt

Luch 5A (Russian: Луч-5А meaning ray and sometimes transliterated as Loutch-5A) is a Russian Luch relay satellite which transmits data from the Russian Orbital Segment of the International Space Station, and from other satellites in low Earth orbit. It is in geosynchronous orbit.

Luch Luch 5A is one of three Luch relay satellites. Luch 5B was launched on 2 November 2012 and Luch 5V was launched on 28 April 2014. They are dual purpose satellites with both military and civil uses, and are similar to those in the US Tracking and Data Relay Satellite System. Luch 5A was built by JSC Information Satellite Systems using the Ekspress-1000A bus. It has 6 S and Ku band channels with repeaters manufactured by Thales Alenia Space and other equipment manufactured by Sumitomo. The Ku band antenna operates at up to 150 Mbit/s and the S band antenna at up to 5 Mbit/s. The satellite also relays COSPAS/SARSAT signals and Planet-S System data. The satellite is designed to relay data from the ISS, satellites in low earth orbit and rocket launch vehicles. Luch 5A is located at 167° E.

Launch Luch 5A was launched on 11 December 2011 with satellite Amos-5. The Proton-M rocket with a Briz-M upper stage launched from Baikonur Cosmodrome launchpad 81/24 at 11:17 UTC. After four burns of the Briz-M upper stage it was placed into geosynchronous transfer orbit.

References

Illustrations

Worked examples

Example 1 — a first encounter with Luch 5A

Start with the simplest possible case. Write down what Luch 5A 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 Luch 5A 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 Luch 5A 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 Luch 5A

In research: Luch 5A 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 Luch 5A 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: Luch 5A is common in secondary-school and first-year university syllabi. It links to neighbouring topics 2011 in Russia, Communications satellites in geostationary orbit, Luch Satellites, so understanding it makes those chapters shorter.
In everyday life: Look for Luch 5A 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Luch 5A” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Luch 5A in 20 minutes

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

Frequently asked questions

What is Luch 5A in simple terms?

Why does Luch 5A 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 Luch 5A?

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 Luch 5A.