Daily Current Affairs 14.05.2022 (ISRO tests booster for Gaganyaan)

Daily Current Affairs 14.05.2022 (ISRO tests booster for Gaganyaan)


1. ISRO tests booster for Gaganyaan

GSLV Mk-III rocket, to be used for the mission, will have two HS200 boosters

The Indian Space Research Organisation (ISRO) has successfully carried out the static test of the HS200 solid rocket booster, taking the space agency one more step closer to the keenly awaited Gaganyaan human spaceflight mission.

The test was held at the Satish Dhawan Space Centre, Sriharikota, on Friday morning.

Designed and developed by the Vikram Sarabhai Space Centre (VSSC) in Thiruvananthapuram for over two years, the HS200 booster is the ‘human-rated’ version of the S200 rocket boosters used on the geosynchronous satellite launch vehicle Mk-III (GSLV Mk-III), also called the LVM3.

The GSLV Mk-III rocket, which will be used for the Gaganyaan mission, will have two HS200 boosters that will supply the thrust for lift-off.

The HS200 is a 20-metre-long booster with a diameter of 3.2 metres and is the world’s second largest operational booster using solid propellants.

During Friday’s test, about 700 parameters were monitored and the performance of all the systems were normal, ISRO said.

Loaded with 203 tonnes of solid propellant, the HS200 booster was tested for a total duration of 135 seconds.

ISRO Chairman S. Somanath and VSSC Director S. Unnikrishnan Nair were present during the test.

“The successful completion of this test marks a major milestone for the prestigious human space flight mission of ISRO, the Gaganyaan, as the first stage of the launch vehicle is tested for its performance for the full duration,” ISRO said in a statement on Friday.

Since Gaganyaan is a manned mission, the GSLV Mk-III will have improvements to increase reliability and safety to meet the requirements of ‘human rating.’

The control system used in the HS200 booster employs one of the world’s most powerful electro-mechanical actuators with multiple redundancy and safety features, according to the VSSC.

Of the three propulsion stages of the GSLV Mk-III, the second stage uses liquid propellant while the third is a cryogenic stage.

Launch Vehicles and Satellites?

  • The rockets have powerful propulsion systems that generate the huge amount of energy required to lift heavy objects like satellites into space, overcoming the gravitational pull of the earth.
  • Satellites carry one or more instruments that do the scientific work for which they are sent into space. Their operational life sometimes extends up to decades.
    • But rockets, or launch vehicles, become useless after the launch. Rockets’ only job is to take the satellites to their intended orbits.
  • Rockets have several detachable energy-providing parts.
    • They burn different kinds of fuels to power the rocket. Once their fuel is exhausted, they detach from the rocket and fall off, often burning off in the atmosphere due to air-friction, and getting destroyed.
    • Only a small part of the original rocket goes till the intended destination of the satellite. Once the satellite is finally ejected, this last part of the rocket either becomes part of space debris, or once again burns off after falling into the atmosphere.

What are the Types of Launch Vehicles?

  • For Lower Earth Orbits:
    • Several satellites need to be deposited only in the lower earth orbitswhich starts from about 180 km from earth’s surface and extends up to 2,000 km.
      • Most of the earth-observation satellites, communication satellites, and even the International Space Station, a full-fledged laboratory in space that hosts astronauts, function in this space.
    • It takes a smaller amount of energy to take the satellites to low-earth orbits, and accordingly smaller, less powerful, rockets are used for this purpose.
  • For Higher Orbits:
    • There are other satellites which need to go much deeper in space.
    • Geostationary satellites, for example, have to be deposited in orbits that are about 36,000 km from earths’ surface.
    • The planetary exploration missions also need their rockets to leave them much deeper in space.
    • For such space missions, much more powerful rockets are used.
      • In general, there is a trade-off between the weight of the satellite that needs to be launched, and the distance it needs to be taken to. The same rocket can take smaller satellites much deeper into space compared to a heavier satellite.
What are the Launch vehicles used by ISRO?
Satellite Launch Vehicle (SLV):The first rocket developed by ISRO was simply called SLV, or Satellite Launch Vehicle.It was followed by the Augmented Satellite Launch Vehicle or ASLV.
Augmented Satellite Launch Vehicle (ASLV):SLV and ASLV both could carry small satellites, weighing up to 150 kg, to lower earth orbits.ASLV operated till the early 1990s before PSLV came on the scene.
Polar Satellite Launch Vehicle (PSLV):PSLV’s first launch was in 1994, and it has been ISRO’s main rocket ever since. Today’s PSLV, however, is vastly improved and several times more powerful than the ones used in the 1990s.It is the first Indian launch vehicle to be equipped with liquid stages.PSLV is the most reliable rocket used by ISRO till date, with 52 of its 54 flights being successful.It successfully launched two spacecraft – Chandrayaan-1 in 2008 and Mars Orbiter Spacecraft in 2013 – that later traveled to Moon and Mars respectively.ISRO currently uses two launch vehicles – PSLV and GSLV (Geosynchronous Satellite Launch Vehicle), but there are lots of different variants of these.
Geosynchronous Satellite Launch Vehicle (GSLV):GSLV is a much more powerful rocket, meant to carry heavier satellites much deeper into space. Till date, GSLV rockets have carried out 18 missions, of which four ended in failure.It can take 10,000-kg satellites to lower earth orbits.The indigenously developed Cryogenic Upper Stage (CUS), forms the third stage of GSLV Mk II.Mk-III versions have made ISRO entirely self-sufficient for launching its satellites.Before this, it used to depend on the European Arianne launch vehicle to take its heavier satellites into space.
Small Satellite Launch Vehicle (SSLV):SSLV is targeted at rising global demand for the launch of small and micro-satellites.SSLV is meant to offer cost-effective launch services for satellites up to 500 kg.It is supposed to carry an indigenous earth observation satellite EOS-03 into space.
Reusable Rockets/ Future Rockets:The future rockets are meant to be reusable. Only a small part of the rocket would be destroyed during the mission.The bulk of it would re-enter the earth’s atmosphere and land very much like an airplane, and can be used in future missions.Reusable rockets would cut down on costs and energy, and also reduce space debris, which is becoming a serious problem because of the large number of launches.Fully-reusable rockets are still to be developed, but partially-reusable launch vehicles are already in use.ISRO has also developed a reusable rocket, called RLV-TD (Reusable Launch Vehicle Technology Demonstrator) which has had a successful test flight in 2016.
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