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Subject: Space Technology

  • What is Project NETRA?

    The Indian Space Research Organisation (ISRO) is building up its orbital debris tracking capability by deploying new radars and optical telescopes under the Network for Space Objects Tracking and Analysis (NETRA) project.

    Project NETRA

    • The project will give India its own capability in space situational awareness (SSA) like the other space powers — which is used to ‘predict’ threats from debris to Indian satellites.
    • NETRA’s eventual goal is to capture the GEO, or geostationary orbit, scene at 36,000 km where communication satellites operate.
    • The initial SSA will first be for low-earth orbits or LEO which have remote-sensing spacecraft.
    • Under NETRA the ISRO plans to put up many observational facilities: connected radars, telescopes; data processing units and a control centre.
    • They can, among others, spot, track and catalogue objects as small as 10 cm, up to a range of 3,400 km and equal to a space orbit of around 2,000 km.
    • The NETRA effort would make India a part of international efforts towards tracking, warning about and mitigating space debris.

    What NETRA consists of?

    • In the plans are a high-precision, long range telescope in Leh and a radar in the North East.
    • Along with them, we will also use the Multi-Object Tracking Radar (MOTR) that we have put up at the Satish Dhawan Space Centre in Sriharikota, and the telescopes at Ponmudi and Mount Abu to get a broad SSA picture.
    • NORAD, or the North American Aerospace Defense Command, is an initiative of the U.S. and Canada that shares selective debris data with many countries.
    • The new SSA centre would consolidate debris tracking activities that are now spread across ISRO centres.
    • Currently there are 15 functional Indian communication satellites in the geostationary orbit of 36,000 km; 13 remote sensing satellites in LEO of up to 2,000 km; and eight navigation satellites in medium earth orbits.

    Why Space debris matters?

    • Space junk or debris consists of spent rocket stages, dead satellites, fragments of space objects and debris resulting from ASAT.
    • Hurtling at an average speed of 27,000 kmph in LEO, these objects pose a very real threat as collisions involving even centimetre-sized fragments can be lethal to satellites.
    • Last year, ISRO monitored 4,382 events in LEO and 3,148 events in the geostationary orbit where space objects closely approached Indian assets.
    • Fragments from the Fengyun-1C satellite (part of the anti-satellite test (ASAT) by China in 2007) and the Cosmos 2251-Iridium satellite collision in 2009 accounted for the maximum number of these threats.
    • The observations also covered 84 “close approaches of less than one km” between Starlink satellites and Indian assets.

    Enhancing Space situational awareness (SSA)

    • India, as a responsible space power, should have SSA as a part of a national capability, as in the U.S. This is a vital requirement for protecting our space assets and a force multiplier.
    • The SSA has a military quotient to it and adds a new ring to the country’s overall security.
    • It uses satellites, ground and air radars to secure its two countries against attacks from air, space or sea.
    • With long-range tracking radars, the SSA also provides us the capability of an early warning system against ballistic missiles coming in at a height.
    • Apart from radars and telescopes, he said India should also think of deploying satellites that track other satellites — as the U.S. and other space powers had done.
    • Combined with other elements of military intelligence SSA would help us to understand motives behind any suspicious orbit changes of other satellites and to know if they were spying on or harming our spacecraft.

     

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  • GSAT 7B and India’s other Military Satellites

    The Defence Acquisition Council (DAC) chaired by Defence Minister Rajnath Singh cleared the Acceptance of Necessity (AoN) for procurement of a GSAT 7B satellite.

    What are the GSAT 7 series satellites?

    • GSAT 7 satellites are advanced satellites developed by the ISRO to meet the communication needs of the defence services.
    • The satellite was injected into a geosynchronous transfer orbit (GTO) of 249 km perigee (nearest point to earth), 35,929 km apogee (farthest point to earth) and an inclination of 3.5 degree with respect to the equator.
    • The GSAT 7 satellite was launched in August 2013 from an Ariane 5 ECA rocket from Kourou in French Guiana.
    • It is a 2,650 kg satellite which has a footprint of nearly 2,000 nautical miles in the Indian Ocean region.

    Utility of this satellite

    • This satellite is mainly used by the Indian Navy for its communication needs.
    • The GSAT 7 provides a gamut of services for military communication needs, which includes low bit voice rate to high bit rate data facilities, including multi-band communications.
    • Named Rukmini, the satellite carries payloads in UHF, C-band and Ku-band, and helps the Navy to have a secure, real time communication link between its land establishments, surface ships, submarines and aircraft.

    What will be the role of the GSAT 7B satellite?

    • The GSAT 7B will primarily fulfil the communication needs of the Army.
    • Currently, the Army is using 30 per cent of the communication capabilities of the GSAT 7A satellite, which has been designed for the Indian Air Force (IAF).
    • The GSAT 7B will also help the Army enhance its surveillance in border areas.
    • While many features of this satellite are still a closely guarded secret, it is expected that the state of the art, multi-band, military-grade satellite shall be a shot in the arm for the communication and surveillance needs of the Army.

    What is the role of the GSAT 7A satellite, which is already operational?

    • The GSAT 7A was launched in 2018 from the Satish Dhawan Space Centre in Sriharikota.
    • It has gone a long way in boosting the connectivity between the ground radar stations, airbases and the airborne early warning and control aircraft (AEW&C) of the IAF.
    • It also helps in satellite controlled operations of unmanned aerial vehicles (UAVs) which gives a great deal of reliability to the operations as compared to ground-controlled operations.
    • This satellite has 10 channels in Ku band with switchable frequency for mobile users, one fixed Gregorian or parabolic antenna, and four steerable antennae.

    Future plans

    • A GSAT 7C satellite is on the cards for the IAF, and a proposal to this effect was cleared by the DAC in 2021.
    • This satellite would facilitate real time communication with IAF’s software defined radio communication sets.
    • It will increase the capability of the IAF to communicate beyond the line of sight in a secure mode.

    What other kinds of military satellites does India have?

    • An Electromagnetic Intelligence Gathering Satellite (EMISAT), developed by ISRO, was launched in April 2020 through a Polar Satellite Launch Vehicle (PSLV-C45).
    • It has an Electronic Intelligence (ELINT) package called Kautilya, which allows the interception of ground-based radar and also carries out electronic surveillance across India.
    • The ELINT package provides the capability in direction-finding of radar and fixing their locations.
    • It is placed in a 748-km orbit, and is said to be based on the Israeli satellite system.
    • This satellite circles the globe pole-to-pole, and is helpful in gathering information from radars of countries that have borders with India.
    • India also has a RISAT 2BR1 synthetic aperture radar imaging satellite, which was launched in December 2019 from Sriharikota.
    • It has the capability to operate in different modes including very high resolution imaging modes of 1×0.5 metre resolution and 0.5×0.3 m resolution with a swath of 5-10 km.

     

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  • Functioning of the ISS after US sanctions

    Western sanctions against Russia could cause the International Space Station (ISS) to crash, the head of Russian space agency Roscosmos has warned.

    What is the ISS?

    • The ISS was launched in 1998 as part of joint efforts by the U.S., Russia, Japan, Canada and Europe.
    • The idea of a space station originated in the 1984 State of the Union address by former U.S. President Ronald Reagan.
    • The space station was assembled over many years, and it operates in low-earth orbit.
    • Since its inception, it has served as a laboratory suspended in space and has aided multiple scientific and technological developments.
    • The ISS was originally built to operate for 15 years.

    Why was ISS launched?

    • A space station permits quantum leaps in research in science, communications, and in metals and lifesaving medicines which could be manufactured only in space.
    • ISS has consistently maintained human presence for the past 21 years, providing astronauts with sophisticated technologies for scientific research.

    What is Russia’s role in maintaining the ISS?

    • The ISS is built with the co-operation of scientists from five international space agencies — NASA of the U.S., Roscosmos of Russia, JAXA of Japan, Canadian Space Agency and the European Space Agency.
    • Each agency has a role to play and a share in the upkeep of the ISS.
    • Both in terms of expense and effort, it is not a feat that a single country can support.
    • Russia’s part in the collaboration is the module responsible for making course corrections to the orbit of the ISS.
    • They also ferry astronauts to the ISS from the Earth and back.
    • Until SpaceX’s dragon spacecraft came into the picture the Russian spacecrafts were the only way of reaching the ISS and returning.

    Why does the orbit of the ISS need to be corrected?

    • Due to its enormous weight and the ensuing drag, the ISS tends to sink from its orbit at a height of about 250 miles above the Earth.
    • It has to be pushed up to its original line of motion every now and then.
    • This is rather routine, even for smaller satellites.
    • Approximately once a month this effort has to be made.
    • The other reason for altering the path of the ISS is to avoid its collision with space debris, which can damage the station.

    What is the extent of effort and expense involved in this?

    • Manoeuvring the ISS is expensive.
    • In a year, 7-8 tonnes of fuel may need to be spent, with each manoeuvre costing nearly a tonne of fuel.
    • If a manoeuvre is put off for later, the ISS may sink a little more and the delayed operation would cost more as a larger correction needs to be made.

    Risks of crashing

    • The orbit of the ISS does not fly over the Russian territory mostly.
    • Places that are closer to the equator run a greater risk of it falling in their domain.
    • The orbit is at about 50 degrees and so most probably, the ISS will fall in that level.
    • But this is only a probability, as it can move or disintegrate.
    • But in case of this eventuality, people in the ISS will be brought back, modules can be detached thereby making it much smaller which will ensure that it disintegrates before touching the earth.

     

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  • NASA to decommission the International Space Station

    The National Aeronautics and Space Administration (NASA) has announced plans to retire and decommission the International Space Station (ISS) by 2031.

    What is the ISS?

    • The ISS was launched in 1998 as part of joint efforts by the U.S., Russia, Japan, Canada and Europe.
    • The idea of a space station originated in the 1984 State of the Union address by former U.S. President Ronald Reagan.
    • The space station was assembled over many years, and it operates in low-earth orbit.
    • Since its inception, it has served as a laboratory suspended in space and has aided multiple scientific and technological developments.
    • The ISS was originally built to operate for 15 years.

    Why was ISS launched?

    • A space station permits quantum leaps in research in science, communications, and in metals and lifesaving medicines which could be manufactured only in space.
    • ISS has consistently maintained human presence for the past 21 years, providing astronauts with sophisticated technologies for scientific research.

    Why is NASA planning to decommission the ISS?

    • The space station has already surpassed that checkpoint by being active for 21 years, with plans to continue operations till 2030.
    • The ISS goes through 16 rotations of the earth per day, causing extreme temperature changes on the exterior.
    • The side facing the sun can get heated up to 121°C while the temperature on the opposite, darker side can fall to –157°C, causing intense expansion and contraction of the building material.
    • This orbital thermal cycling, coupled with dynamic loading, affects the longevity of the primary structure of the space station.
    • The technical lifetime is also limited by parts like radiators, modules and truss structures that tend to degrade over time.

    What is the procedure to de-orbit the ISS?

    • NASA plans to remove the ISS from its orbit around the earth and eventually plunge it into the ocean at a point farthest from human civilisation.
    • The space agency will use the dual method of natural orbit decay and a re-entry manoeuvre to bring an end to the ISS as we know it.
    • According to the plan, the earth’s natural atmospheric drag will be used in lowering the altitude of the ISS while setting up the de-orbit.
    • The space station operators will then provide the final push to it to lower the structure to the maximum possible height and ensure safe re-entry into the earth’s atmosphere.
    • It would then lead to Point Nemo over the South Pacific Oceanic Uninhabited Area (SPOUA).
    • Dissembling process would have posed huge logistical and financial challenges.

    How big is it?

    • The ISS is a huge structure — almost the size of a football field — and it was not designed to be disassembled easily in space.
    • The station currently operates in low-earth orbit above 400 km in altitude, at a point where it still experiences atmospheric drag and requires re-boosts to continue in its orbit.
    • The station also has a mass of over 4,30,000 kg.
    • Existing propulsion systems do not have the capacity to raise the station’s altitude to a high target and escape low-earth orbit.
    • The random re-entry method was discarded since it carries a huge risk for the human population on the ground.

    What is the future of space stations?

    • As the ISS plans to end operations in space, new players are already lining up to replace it.
    • In January 2022, China announced that its space station will be ready for operations this year.
    • Blue Origin, the aerospace company founded by Jeff Bezos, has also announced its plans to build Orbital Reef, a commercially developed, owned, and operated space station in low-earth orbit.
    • Blue Origin is working alongside Sierra Space on the project.

     

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  • All you need to know about Satellite Internet

    The Reliance has launched a joint venture (JV) with European satellite-based broadband service company SES to enter the satellite internet space.

    What is Satellite Internet?

    • The technology beams the internet down from a satellite that’s orbiting the Earth.
    • Jio, Bharti Airtel Ltd’s OneWeb, and billionaire Elon Musk’s Starlink want to send thousands of these satellites to orbit.
    • OneWeb plans to launch 648 satellites, while Musk’s Starlink has permits to launch over 4,000 of them.
    • So far, OneWeb has launched over 400 satellites, while Starlink has launched over 2,000 satellites.
    • It’s worth noting that Starlink plans to launch 42,000 satellites in the coming decade. Jio’s journey has only just begun.

    Which satellites will Indian JV use?

    • The JV will use geostationary (GEO) and medium earth orbit (MEO) satellites, while Starlink and OneWeb use low earth orbit (LEO) satellites.
    • LEO satellites are cheaper to make and deploy, but require a satellite constellation working in sync to offer coverage on earth.
    • On the other hand, GEO and MEO satellites are larger, deployed in higher orbits, and therefore cost more.
    • These satellites cover a larger area and require fewer ground stations, which makes them ideal for targeted coverage area.
    • LEOs move faster and can hence provide global coverage.

    What are the advantages of satellite internet?

    • The reason telecom firms want to explore satellite internet is because there are areas where fibre connections just can’t reach.
    • Satellite networks are used to bring connectivity in such areas, which include hills and remote islands.
    • Consumer applications are new, but satellite networks have been used for ages in military applications.

    Are there any disadvantages?

    • The applications and the power of satellite internet are often exaggerated.
    • In reality, these networks have limitations, the biggest being high latency and low bandwidths.
    • Latency is all about internet speed, while bandwidth determines how many devices can connect on a network at the same time.
    • Experts say current satellite connections will bring 1-2 MB bandwidth, which just about qualifies as broadband under India’s broadband policy.
    • Trouble-shooting can be a problem because it needs specialized knowledge.

    Who can use satellite internet?

    • Militaries across the world have depended on satellite communications for a long time.
    • However, many military experts, too, consider this form to be unreliable and too expensive to be made the sole communication medium.
    • In remote areas, satellite internet can still allow businesses to open up local branches and provide digital services.
    • In theory, a bank could set up more ATMs in remote regions if it has access to satellite internet.

     

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  • Can dark matter be composed, even partly, of black holes?

    A recent hypothesis says that dark matter comprises a large number of compact objects such as primordial black holes.

    What are Dark Matters ?

    • Astronomical observations suggest that a significant part of the universe is made up of dark matter which interacts with the rest of the universe only through the gravitational pull.
    • Many large lab experiments have tried to detect elementary particles that could be candidates for dark matter.
    • However, such dark matter particles have not been detected until now.
    • Several astronomical observations suggest that all galaxies are embedded in a “halo” of dark matter.
    • The “visible” galaxy is like a disc embedded in a dark matter halo that is much larger in size.

    What is the recent proposition?

    • When the universe was very young, hot and dense – soon after the Big Bang, it must have had quantum fluctuations of its density.
    • This, in turn, would have caused some regions to become extremely dense, and therefore, to collapse under their own gravity to form the primordial black holes.
    • While we have no conclusive evidence of spotting these objects, some of the binary black hole mergers detected by the LIGO gravitational wave detectors might be primordial black holes.
    • The question is open there is good reason to believe that primordial black holes did form in the young universe.

    Observing dark matter: Gravitational Lensing

    • The paper explores what happens when such objects get in the way of gravitational waves traveling towards the Earth from the distance.
    • It invokes a phenomenon called gravitational lensing that is used regularly in astronomy.
    • When light travels through space and passes near a massive or compact body – a star, a galaxy or a black hole, for example, the intense gravity of that body may attract the light towards it.
    • This causes bending it from its rectilinear (straight line) path.
    • This phenomenon is known as gravitational lensing and was first observed by Arthur Eddington in 1919.

    How intense are they?

    • Massive objects like galaxies can bend light significantly, producing multiple images, this is called strong lensing.
    • Lighter objects like stars or black holes bend light less, and this is called micro-lensing.
    • A similar lensing can happen to gravitational waves travelling towards the Earth, and this would leave signatures in the detected gravitational waves.
    • This can be used to detect the presence, or the existence, of primordial black holes.

    Assessing dark matter

    • Until now, individual black holes have not marked out these signatures on gravitational waves detected by the LIGO-VIRGO detectors.
    • However, if all of the dark matter is made of primordial black holes, they should have produced detectable signatures on the gravitational wave signals.
    • The researchers use the non-observation of the lensing signatures to assess what fraction of the dark matter could be made of black holes.

    Way ahead

    • This provides a new way of constraining the nature of dark matter.
    • The study concludes that black holes in the mass range from a hundred to a million solar masses can contribute only up to 50-80% of the dark matter in the universe.
    • This is an upper limit and the actual fraction can be much smaller.
    • These upper limits will get better and better with more and more observations.

     

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  • Lucy Mission to probe Jupiter’s Trojan Asteroids

    NASA is set to send its first spacecraft to study Jupiter’s Trojan asteroids to glean new insights into the solar system’s formation 4.5 billion years ago.

    Lucy Mission

    • Lucy will fly by eight Jupiter asteroids—seven Trojans and one main-belt asteroid — over the next 12 years.
    • It is NASA’s first single spacecraft mission in history to explore so many different asteroids.
    • Lucy will run on solar power out to 850 million km away from the Sun.
    • This makes it the farthest-flung solar-powered spacecraft ever, according to NASA.

    What is Jupiter Trojan Asteroids?

    • Simply known as Trojans, they are a large group of asteroids that share Jupiter’s orbit around the Sun.
    • Thousands of such asteroids exist in a gravitationally stable space.
    • The swarms lead and follow the planet Jupiter along its orbit around the Sun.

    What exactly are Trojans?

    • Lucy’s Trojan destinations are trapped near Jupiter’s Lagrange (L) points, which are gravitationally stable locations — it is where the gravity from the Sun and from Jupiter cancel each other out.
    • This means their orbits are stable and the Trojans are trapped in the space between.
    • This also means that asteroids are as far away from Jupiter as they are from the Sun.
    • Jupiter’s leading and trailing Lagrangian points (L4 and L5) have been stable over the age of the solar system.
    • This means that their orbits have accumulated many, many asteroids.
    • It makes sense to call a Trojan a co-orbital object, which moves around one of the two stable Lagrangian points.

    When and how were they discovered?

    • It took many a scientist to understand Trojans, and subsequently, name them so.
    • A German astrophotographer in 1906 made an important discovery: An asteroid with a particularly unusual orbit. As Jupiter moved, this asteroid remained ahead of Jupiter.
    • It was observed that the asteroid was nearly 60 degrees in front of Jupiter.

    Students with engineering background would better understand who Lagrange was. Rest need not care.

    Lagrange’s propositions

    • This specific position of a particular behavior was predicted by the Italian-French mathematician Joseph-Louis Lagrange over 100 years earlier.
    • Lagrange had argued that if a small celestial body is placed at one of two stable points in a planet’s orbit around the Sun (the L4 and L5), the asteroid would remain stationary from the planet’s perspective.
    • This is due to the combined gravitational forces of the planet and the Sun.
    • Thus, Lagrange’s prediction acquired credibility. More such asteroids were discovered over subsequent months in Jupiter’s Lagrange point L5.

    Behind the name: Lucy

    • It is the fossil of a hominin that lived 3.2 million years ago.
    • She is known to be one of the most famous pre-human fossils in history.
    • Nearly 40 percent of the fossilized skeleton of this hominin was discovered in 1974 by a team of paleoanthropologists led by Donald Johanson.
    • The name was inspired from the famous Beatles song “Lucy in the Sky With Diamonds,” which Johanson’s team listened to at camp the night of their discovery.

    Back2Basics: Lagrange Points

    • Lagrange points are positions in space where objects sent there tend to stay put.
    • They are named after Italian-French mathematician Josephy-Louis Lagrange.
    • At Lagrange points, the gravitational pull of two large masses precisely equals the centripetal force required for a small object to move with them.
    • These points in space can be used by spacecraft to reduce the fuel consumption needed to remain in position.
    • There are five special points where a small mass can orbit in a constant pattern with two larger masses.

     

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  • India’s geospatial sector

    Context

    Last year new guidelines took effect to completely de-regulate the geospatial sector for Indians.

    Potential of India’s geospatial sector

    • India has a robust ecosystem in geospatial, with the Survey of India (SoI), the Indian Space Research Organisation (ISRO), remote sensing application centres (RSAC)s, and the National Informatics Centre (NIC) in particular, and all ministries and departments, in general, using geospatial technology.
    • However, the full benefits have yet to percolate to the public; neither is there much contribution to the nation’s GDP.
    • The Prime Minister’s speech during Independence Day and mention of geospatial in the Union Budget have created the necessary buzz.
    • The last year has also witnessed some activity on the ground.
    • The most noticeable was the over subscription of the initial public offering of MapmyIndia.
    • The other noticeable activity was the launching of a city mapping programme by Genesys International in India.
    • Such an aggressive stance by investors for geospatial was not seen in the earlier regime; it is certain that the new guidelines have played a role.

    Challenges

    • Lack of demand: There is no demand for geospatial services and products on a scale linked to India’s potential and size.
    • This is mainly due to the lack of awareness among potential users in government and private.
    • Lack of skilled manpower: The other hurdle has been the lack of skilled manpower across the entire pyramid.
    • Unavailability of foundation data: The unavailability of foundation data, especially at high-resolution, is also a constraint.
    • Lack of clarity on data sharing: The lack of clarity on data sharing and collaboration prevents co-creation and asset maximisation.
    • Lastly, barring a few cases, there are still no ready-to-use solutions especially built to solve the problems of India.

    Suggestions

    •  Despite one year since the new guidelines came into effect, users are still not fully aware of things.
    • Publish policy document: First and foremost is the need to publish the entire policy document and make government and private users aware of things.
    • Data sharing protocol: The data available with government departments should be unlocked, and data sharing should be encouraged and facilitated.
    • Standards: The Government needs to invest in developing standards and must mandate the adoption of standards
    • Foundation data: While different types of data will be produced on a project-to-project basis, there is a need to generate foundation data across India.
    • This should include the Indian national digital elevation model (InDEM), data layers for cities, and data of natural resources.
    • Local technology and solutions should be promoted, and competition should be encouraged for quality output.
    • As the new guidelines prevent high-accuracy data being stored in overseas clouds, there is a need to develop a geospatial data cloud locally and facilitate a solution as service.
    • Professionals: Unlike the West, India lacks a strata of core professionals who understand geospatial end-to-end. India should start a bachelor’s programme in geospatial also in the Indian Institutes of Technology and the National Institutes of Technology.
    • Besides these, there should be a dedicated geospatial university.

    Conclusion

    The geospatial sector in the country is rightly positioned for investment. However, clarity on the issues discussed and the creation of an enabling ecosystem are essential.

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  • What are Earth Observation Satellites (EOS)?

    After a disappointing 2021 which saw just one successful launch, ISRO is getting back to business with the EOS-04, an earth observation satellite.

    What are EOS?

    • An EOS or Earth remote sensing satellite is a satellite used or designed for Earth observation (EO) from orbit.
    • It includes spy satellites and similar ones intended for non-military uses such as environmental monitoring, meteorology, cartography, and others.
    • The most common type is Earth-imaging satellites that take satellite images, analogous to aerial photographs.
    • Some EOS may perform remote sensing without forming pictures, such as in GNSS radio occultation.

    What is EOS-04 all about?

    • The EOS-04 is fourth in a series of earth observation satellites that are being launched under a new generic name.
    • It is designed to provide high-quality images for applications such as agriculture, forestry, and plantations, flood mapping, soil moisture, and hydrology.
    • It will complement the data from Resourcesat, Cartosat and RISAT-2B series of satellites that are already in orbit.

    Why such different nomenclature?

    • Two years ago, ISRO had moved to a new naming system for its earth observation satellites which till then had been named thematically, according to the purpose they were meant for.
    • The Cartosat series of satellites were meant to provide data for land topography and mapping, while the Oceansat satellites were meant for observations overseas.
    • Some INSAT-series, Resourcesat series, GISAT, Scatsat, and a few other earth observation satellites were named differently for the specific jobs they were assigned to do, or the different instruments that they.
    • All these would now become part of the new EOS series of satellites.

    What other satellites are being launched?

    • Besides EOS-04, two other small satellites —INSPIREsat-1 and INS-2TD — will ride on the heaviest version of the PSLV rocket in the early hours from the Sriharikota launch range.
    • The other co-passenger, INS-2TD, is a technology demonstrator for the first India-Bhutan joint satellite that is scheduled to be launched next month.
    • The two countries had signed a space agreement last year, and its first outcome would be the launch of Bhutan-Sat, or INS-2B, on a PSLV rocket.

    How many satellites does India have in space?

    • India currently has 53 operational satellites, of which 21 are earth observation ones and another 21 are communication-based.
    • EOS-4 launch would be the 54th flight of the PSLV rocket, and the 23rd of its most powerful XL-version that has six strap-on boosters.

     

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  • Chandrayaan-3 set for launch in August

    ISRO plans to execute the Chandrayaan-3 mission in August this year.

    What is Chandrayaan-3 Mission?

    • The Chandrayaan-3 mission is a follow-up of Chandrayaan-2 of July 2019, which aimed to land a rover on the lunar South Pole.

    Chandrayaan-2: A quick recap

    • Chandrayaan-2 consisted of an Orbiter, Lander and Rover, all equipped with scientific instruments to study the moon.
    • The Orbiter would watch the moon from a 100-km orbit, while the Lander and Rover modules were to be separated to make a soft landing on the moon’s surface.
    • ISRO had named the Lander module as Vikram, after Vikram Sarabhai, the pioneer of India’s space programme, and the Rover module as Pragyaan, meaning wisdom.

    Utility of the Orbiter

    • The Orbiter part of the mission has been functioning normally. It is carrying eight instruments.
    • Each of these instruments has produced a handsome amount of data that sheds new light on the moon and offers insights that could be used in further exploration.

    Inception of Chandrayaan 3

    • The subsequent failure of the Vikram lander led to the pursuit of another mission to demonstrate the landing capabilities needed for the Lunar Polar Exploration Mission proposed in partnership with Japan for 2024.

    Its design

    • The lander for Chandrayaan-3 will have only four throttle-able engines.
    • Unlike Vikram on Chandrayaan-2 which had five 800N engines with a fifth one being centrally mounted with a fixed thrust.
    • Additionally, the Chandrayaan-3 lander will be equipped with a Laser Doppler Velocimeter (LDV).

    Back2Basics: Chandrayaan-1 Mission

    • The Chandrayaan-1 mission was launched in October 2008 was ISRO’s first exploratory mission to the moon, in fact to any heavenly body in space.
    • The mission was designed to just orbit around the moon and make observations with the help of the instruments onboard.
    • The closest that Chandrayaan-1 spacecraft came to the moon was in an orbit 100 km from its surface.

     

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