astronomy

Spaceway-1

Spaceway-1 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 Spaceway-1 rather than just read about it. In short: Spaceway-1 was a part of AT&T's constellation of direct broadcast satellites. The satellite was launched via a Zenit-3SL rocket from Sea Launch's Odyssey equatorial ocean platform on 26 April 2005.

Key takeaways

Spaceway-1 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Spaceway-1 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Spaceway-1 from memory before moving on to harder problems.

Reference excerpt

Spaceway-1 was a part of AT&T's constellation of direct broadcast satellites. The satellite was launched via a Zenit-3SL rocket from Sea Launch's Odyssey equatorial ocean platform on 26 April 2005. Its operational position was in geosynchronous orbit 35,800 kilometres (22,200 mi) above the equator at 102.8° West longitude. Spaceway-1 was a Boeing 702-model satellite with a 12-year operational life expectancy. It provided high-definition television to DirecTV customers with its Ka-band communications payload. DirecTV did not make use of the broadband capabilities on Spaceway-1 even though it was originally built by Boeing for this purpose.

History Spaceway-1 was the heaviest commercial communications satellite 6080 kg ever put into orbit until iPSTAR-1 (6775 kg) was launched by Arianespace on 11 August 2005. T10 was co-located with Spaceway-1 in order to use the 500 MHz of unused spectrum for HDTV broadcasting. This spectrum was originally intended for the broadband internet capabilities of the two Spaceway satellites, called Spaceway, which were disabled by Hughes Network Systems at the request of DirecTV.

Retirement During its last years, Spaceway-1 mainly served as a backup satellite. In December 2019, the satellite suffered significant and irreversible thermal damage to its battery, forcing it to rely only on power generated from its solar arrays and prompting AT&T to request the spacecraft be decommissioned before February 25, 2020, to prevent the risk of the spacecraft exploding. The satellite was moved into a graveyard orbit above the geostationary orbit and was announced as decommissioned on February 14, 2020.

References

External links Boeing 702HP Fleet at the Wayback Machine (archived 2015-03-04)

Worked examples

Example 1 — a first encounter with Spaceway-1

Start with the simplest possible case. Write down what Spaceway-1 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 Spaceway-1 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 Spaceway-1 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 Spaceway-1

In research: Spaceway-1 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 Spaceway-1 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: Spaceway-1 is common in secondary-school and first-year university syllabi. It links to neighbouring topics American spacecraft stubs, Communications satellite stubs, Communications satellites in geostationary orbit, so understanding it makes those chapters shorter.
In everyday life: Look for Spaceway-1 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 Spaceway-1 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Spaceway-1 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 Spaceway-1 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Spaceway-1 in simple terms?

Spaceway-1 was a part of AT&T's constellation of direct broadcast satellites. The satellite was launched via a Zenit-3SL rocket from Sea Launch's Odyssey equatorial ocean platform on 26 April 2005.

Why does Spaceway-1 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 Spaceway-1?

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 Spaceway-1.