How are satellites launched into different orbits?

In one line

The rule

To place a satellite in a specific orbit, scientists control the launch angle, speed, and timing so that the satellite follows the desired path around Earth.

Let's understand it simply

Imagine you are playing cricket. If you hit the ball softly, it falls nearby. If you hit it hard and at the right angle, it goes far. Launching a satellite is similar. The rocket must push the satellite with just the right speed and angle, so it circles Earth at the height and path we want.

Think of Earth as a giant round field. If you throw a stone fast enough sideways, it keeps falling towards Earth, but Earth curves away, so it keeps missing the ground — this is what happens in orbit.

How it works

1. Planning the orbit: Scientists decide what job the satellite will do (like TV, weather, GPS) and pick the best orbit (path around Earth).
2. Choosing the launch site and time: The launch location and timing are chosen so the rocket can reach the right direction and angle for the orbit.
3. Launching the rocket: The rocket lifts off and follows a path called a trajectory (the route it takes through the sky).
4. Reaching the right speed: The rocket must reach a certain speed (called orbital velocity) to stay in orbit. For low Earth orbit, this is about 28,000 km/h!
5. Releasing the satellite: At the right height and angle, the rocket lets go of the satellite. Sometimes, a final small engine (kick stage) gives it a last push.
6. Adjusting the orbit: The satellite may use its own small engines to fine-tune its path.

The story behind it

The first artificial satellite, Sputnik 1, was launched by the Soviet Union in 1957. Scientists wanted to study Earth's atmosphere and space. They found that by reaching a high enough speed sideways, an object could circle Earth without falling down. This changed how we communicate, study weather, and even watch TV.

India launched its first satellite, Aryabhata, in 1975 using a Soviet rocket. Today, ISRO (Indian Space Research Organisation) launches many satellites for India and other countries.

Where you see it in real life

• TV satellites: Placed in geostationary orbit (about 36,000 km above Earth) so they stay above the same spot. This lets your dish always point in one direction.
• Weather satellites: Often in polar orbits, passing over the poles to scan the whole planet as Earth spins.
• GPS satellites: In medium Earth orbit, arranged so your phone can always see at least four for accurate location.
• Spy satellites: Use low Earth orbits to get clear, close-up pictures of the ground.
• Communication satellites: Different orbits are chosen based on coverage area and purpose.
• ISRO launches: The PSLV rocket can put satellites into polar orbits, while GSLV is used for higher orbits.

Why it matters

• Communication: TV, internet, and phone signals rely on satellites in the right orbits.
• Weather forecasting: Accurate weather reports need satellites in special orbits to watch clouds and storms.
• Navigation: GPS and other systems work only if satellites are in the correct paths.
• Defence and security: Countries use satellites for surveillance and disaster warning.
• Space science: Studying space, planets, and the Sun needs satellites in special orbits.

Worked example

Let's say we want to launch a weather satellite into a polar orbit at 800 km altitude.

Given: Desired orbit = polar, altitude = 800 km
Step 1: Choose launch site close to the equator (e.g., Sriharikota)
Step 2: Plan launch time so Earth's rotation helps reach polar direction
Step 3: Launch rocket north-south to reach polar path
Step 4: Rocket reaches 800 km height and about 27,000 km/h speed
Step 5: Release satellite at the right point; satellite enters polar orbit
Step 6: Satellite uses small thrusters to adjust its path if needed

Common mistakes

• Thinking all satellites are at the same height: Different jobs need different orbits and heights.
• Believing satellites just go straight up: Rockets go up, then turn sideways to build up speed along Earth's curve.
• Forgetting about Earth's rotation: Launch timing and location matter because Earth is spinning.
• Assuming satellites stay still in space: Most are moving very fast to stay in orbit.

Remember it

Satellites reach their orbits by launching at the right speed, angle, and direction — like hitting the perfect cricket shot, but into space!