astronomy

INSAT-3C

INSAT-3C 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 INSAT-3C rather than just read about it. In short: INSAT-3C is a multipurpose satellite built by ISRO and launched by Arianespace in Jan 2002. INSAT-3C is the second satellite of the INSAT-3 series.

Key takeaways

INSAT-3C belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect INSAT-3C to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of INSAT-3C from memory before moving on to harder problems.

Reference excerpt

INSAT-3C is a multipurpose satellite built by ISRO and launched by Arianespace in Jan 2002. INSAT-3C is the second satellite of the INSAT-3 series. All the transponders provide coverage over India. Insat-3C is controlled from the Master Control Facility at Hassan in Karnataka. It will provide voice, video and digital data services to India and neighboring countries.

Launch INSAT 3C was launched by the Ariane 4 launch vehicle of Arianespace at 5:17 am IST from Kourou, French Guiana in South America. INSAT-3C was placed into a Geo-synchronous Transfer Orbit (GTO), 21 minutes after the lift-off, in a 3-axis stabilised mode, with a perigee of 570 km and an apogee of 35,920 km and an inclination of 4° with respect to the equator. After 4 maneuvers INSAT-3C has been put in its final three axis stabilised mode on February 1, 2002. The orbit rising maneuvers were carried out in phases by firing the 440 Newton Liquid Apogee Motor(LAM). The satellite carried about 1.5 tonne of propellant (MMH (MonoMethylHydrazine) and MON-3 (Mixed Oxides of Nitrogen)) for orbit raising operations as well as for station keeping and in-orbit attitude control.INSAT-3C like all of its predecessors in the INSAT series has a 3-axis body stabilized spacecraft using momentum/reaction wheels Earth sensors, Sun sensors, inertial reference unit and magnetic torquers. It is equipped with unified bi-propellant thrusters.

Payload INSAT-3C, carrying Fixed Satellite Services (FSS) transponders, Broadcast Satellite Services (BSS) transponders & Mobile Satellite Services (MSS) transponders is intended to continue the service of INSAT-2DT and INSAT-2C which were nearing their end to life besides enhancing and augmenting the INSAT system capacity.

24 Normal C-band transponders providing an EIRP of 37 dBW 6 Extended C-band transponders with EIRP of 37 dBW 2 S-band transponders to provide BSS services with 42 dBW EIRP 1 MSS transponder operating in S-band up-link and C-band downlink The satellite was designed for operations near 74 deg Longitude.

References

External links

ISRO website Commercial arm of ISRO Dept. of Space Under Dept. of Science & Technology, Government Of India

Illustrations

Worked examples

Example 1 — a first encounter with INSAT-3C

Start with the simplest possible case. Write down what INSAT-3C 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 INSAT-3C 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 INSAT-3C 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 INSAT-3C

In research: INSAT-3C 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 INSAT-3C 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: INSAT-3C is common in secondary-school and first-year university syllabi. It links to neighbouring topics 2002 in India, Communications satellites in geostationary orbit, INSAT satellites, so understanding it makes those chapters shorter.
In everyday life: Look for INSAT-3C 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 INSAT-3C in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what INSAT-3C 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 INSAT-3C out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is INSAT-3C in simple terms?

INSAT-3C is a multipurpose satellite built by ISRO and launched by Arianespace in Jan 2002. INSAT-3C is the second satellite of the INSAT-3 series.

Why does INSAT-3C 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 INSAT-3C?

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 INSAT-3C.