astronomy

Telkom-2

Telkom-2 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 Telkom-2 rather than just read about it. In short: Telkom-2 was a geosynchronous communications satellite built by Orbital Sciences Corporation (OSC) for Indonesia's state-owned telecommunications company, PT Telekomunikasi Indonesia Tbk (PT Telkom). Telkom-2 was successfully launched on 16 November 2005, at 23:46:00 UTC and positioned in geostationary orbit, at 118° East for replaced Palapa-B4.

Key takeaways

Telkom-2 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Telkom-2 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Telkom-2 from memory before moving on to harder problems.

Reference excerpt

Telkom-2 was a geosynchronous communications satellite built by Orbital Sciences Corporation (OSC) for Indonesia's state-owned telecommunications company, PT Telekomunikasi Indonesia Tbk (PT Telkom). Telkom-2 was successfully launched on 16 November 2005, at 23:46:00 UTC and positioned in geostationary orbit, at 118° East for replaced Palapa-B4.

History Based on Orbital's highly successful and flight-proven STAR-2 satellite bus, Telkom-2 featured state-of-the-art communications satellite technology, and 24 C-band transponders. The new spacecraft replaced PT Telkom's on-orbit Palapa-B4 satellite, improved communications coverage across Indonesia, and allowed PT Telkom to expand its coverage area into southeast Asia and the Indian subcontinent. Orbital also supplemented Telkom's existing ground station, and offered extensive mission operations support. There were several postponements prior to Telkom-2's launch. Three launch delays happened in November 2005 due to technical problems with the Ariane 5 launch vehicle. Multiple delayed took place between November 2004 and October 2005 due to different problems including technical problems with the satellite. Orbital's contract with PT Telkom included an optional order for another geostationary satellite. Telkom-2 was finally launched on 16 November 2005. Telkom-2 successfully operated for 15 years. The satellite was retired and placed into a graveyard orbit in June 2021. Specification of Telkom-2 satellite:

Owner: PT Telkomunikasi Indonesia Tbk (PT Telkom) Mission: C-band communications for Indonesia Performance: Repeater - two groups of 15-for-12 linearized traveling-wave tube assemblies (TWTA) Transponders Power - 39 watts RF Stabilization - three-axis, zero momentum Redundancy: Full dual string Solar arrays: 2 panel wings with improved triple-junction GaAs cells Propulsion: Liquid bi-propellant transfer orbit system; monopropellant (hydrazine) on-orbit Repeater: Two groups of 15-for-12 linear traveling wave tube assemblies (TWTAs) Antenna: Two 2.0 m (6.6 ft) dual-griddled shaped-beam reflectors

Also Article Satelit Telkom-2 telah Diluncurkan, internet: https://web.archive.org/web/20070623104954/http://pribadi.or.id/diary/2005/11/17/satelit-telkom-2-telah-diluncurkan/

References

External links Telkom-2 Telkom-1 Satellites in Space, (orbital.com)

Worked examples

Example 1 — a first encounter with Telkom-2

Start with the simplest possible case. Write down what Telkom-2 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 Telkom-2 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 Telkom-2 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 Telkom-2

In research: Telkom-2 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 Telkom-2 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: Telkom-2 is common in secondary-school and first-year university syllabi. It links to neighbouring topics 2005 in Indonesia, Communications in Indonesia, Communications satellites, so understanding it makes those chapters shorter.
In everyday life: Look for Telkom-2 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 Telkom-2 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Telkom-2 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 Telkom-2 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Telkom-2 in simple terms?

Why does Telkom-2 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 Telkom-2?

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 Telkom-2.