astronomy

Telstar 18

Telstar 18 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 Telstar 18 rather than just read about it. In short: Telstar 18 (Apstar 5) is a Russian communications satellite that was launched by a Zenit-3SL rocket from the Ocean Odyssey platform floating on the equatorial Pacific Ocean at 04:00 UT on 29 June 2004. It was intended to be a geostationary satellite, but due to the premature stoppage of the boost from the final DM-SL stage, it ended at 21000 km, far below the geostationary orbit.

Key takeaways

Telstar 18 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Telstar 18 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Telstar 18 from memory before moving on to harder problems.

Reference excerpt

Telstar 18 (Apstar 5) is a Russian communications satellite that was launched by a Zenit-3SL rocket from the Ocean Odyssey platform floating on the equatorial Pacific Ocean at 04:00 UT on 29 June 2004. It was intended to be a geostationary satellite, but due to the premature stoppage of the boost from the final DM-SL stage, it ended at 21000 km, far below the geostationary orbit. Trim-maneuver thrusters attached to the satellite were used to slowly raise to geostationary orbit to an approximately geostationary status at 36000 km. Telstar 18 is designed for a mission life of 13 years. Although fuel use from trim-maneuver thrusters can impact adversely the useful lifespan of a geostationary. The satellite was projected to have enough fuel left to exceed the planned 13 year lifetime. Telstar 18 provides Ku-band voice, video and data services to China, Hawaii, and East Asia. It also provides C-band services to other parts of the Asia-Pacific region, including Australia and Hawaii. The satellite is used to provide space-based Internet backbone services for the main cities of Asia to and from the United States through Hawaii.

References

Worked examples

Example 1 — a first encounter with Telstar 18

Start with the simplest possible case. Write down what Telstar 18 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 Telstar 18 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 Telstar 18 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 Telstar 18

In research: Telstar 18 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 Telstar 18 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: Telstar 18 is common in secondary-school and first-year university syllabi. It links to neighbouring topics 2004 in Canada, 2004 in spaceflight, Canadian broadcasting stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Telstar 18 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 Telstar 18 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Telstar 18 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 Telstar 18 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Telstar 18 in simple terms?

Why does Telstar 18 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 Telstar 18?

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 Telstar 18.