astronomy

T11 (satellite)

T11 (satellite) 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 T11 (satellite) rather than just read about it. In short: T11, formerly known as DirecTV-11, is a Boeing model 702 satellite built by the Boeing Satellite Development Center. Its current name was adopted in 2017.

Key takeaways

T11 (satellite) belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect T11 (satellite) to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of T11 (satellite) from memory before moving on to harder problems.

Reference excerpt

T11, formerly known as DirecTV-11, is a Boeing model 702 satellite built by the Boeing Satellite Development Center. Its current name was adopted in 2017.

Technology This satellite is functionally identical to T10 and is co-located with SPACEWAY-2 at or very near 99.225°W.

Launch data T11 had originally been scheduled for launch by Sea Launch in November, 2007. Following a launch failure at Sea Launch that resulted in damage to the facility, the expected launch date was changed to March 19, 2008. Launch occurred at 22:47:59 UTC on March 19, 2008, and the spacecraft separated from the carrier rocket 61 minutes later, following a successful ascent.

Testing Boeing handed over the T11 satellite to DirecTV on Monday, July 21, 2008, according to a press release on the Boeing website. This means that the satellite is "parked" at or extremely close to its final location of 99.225ºW. Customers with High-Definition receivers or High-Definition DVRs can see new satellite readings under the "Satellite Strength" menu on their receiver. T11 will show up as 99(a) or 99(b) for High-Def receivers and 99(c) and 99(s) for High-Definition DVRs.

Broadcasting to customers T11 began broadcasting High-Definition channels to customers on July 31, 2008. Those first channels were MPEG-4 counterparts of the older MPEG-2 channels DirecTV originally carried in the 70-79 channel range as well as four east coast distant network channels. Since the initial roll out of channels in July, DirecTV has added over 40 more HD channels to T11. These channels included converting some part-time regional sports networks to full-time HD channels as well as new national HD channels like ABC Family and Comedy Central, some premium channels, and HD pay-per-view. T11 now broadcasts over 50 HD channels, bringing DirecTV's total HD channel count over 130.

References

External links

Worked examples

Example 1 — a first encounter with T11 (satellite)

Start with the simplest possible case. Write down what T11 (satellite) 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 T11 (satellite) 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 T11 (satellite) 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 T11 (satellite)

In research: T11 (satellite) 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 T11 (satellite) 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: T11 (satellite) is common in secondary-school and first-year university syllabi. It links to neighbouring topics Communications satellites in geostationary orbit, DirecTV, Satellite television, so understanding it makes those chapters shorter.
In everyday life: Look for T11 (satellite) 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 T11 (satellite) in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what T11 (satellite) 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 T11 (satellite) out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is T11 (satellite) in simple terms?

T11, formerly known as DirecTV-11, is a Boeing model 702 satellite built by the Boeing Satellite Development Center. Its current name was adopted in 2017.

Why does T11 (satellite) 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 T11 (satellite)?

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 T11 (satellite).