The first space-based observatory to study the Sun, the spacecraft, after traveling about 1.5 million km from the Earth over 125 days, is expected to be placed in a Halo orbit around the Lagrangian point L1 which is considered closest to the Sun.

ISRO on Saturday launched the country’s ambitious Solar mission, Aditya L1 eyeing history again after its successful lunar expedition, Chandrayan 3 a few days ago.

As the 23.40-hour countdown concluded, the 44.4 meter tall Polar Satellite Launch Vehicle (PSLV) soared majestically at the prefixed time of 11.50 am from this spaceport, located on the Eastern coast about 135 km from Chennai.

It will be PSLV’s “longest flight” for about 63 minutes.

According to ISRO, Aditya-L1 is the first space-based observatory to study the Sun. The spacecraft, after traveling about 1.5 million km from the Earth over 125 days, is expected to be placed in a Halo orbit around the Lagrangian point L1 which is considered closest to the Sun.

Among others, it will send pictures of the sun for scientific experiments.

According to scientists, there are five Lagrangian points (or parking areas) between the Earth and the Sun where a small object tends to stay if put there. The Lagrange Points are named after Italian-French mathematician Joseph-Louis Lagrange for his prize-winning paper — “Essai sur le Probl me des Trois Corps, 1772.”

These points in space can be used by spacecraft to remain there with reduced fuel consumption.

At a Lagrange point, the gravitational pull of the two large bodies (the Sun and the Earth) equals the necessary centripetal force required for a small object to move with them.

After the lift-off at the Satish Dhawan Space Centre here, the scientists would be involved in placing the spacecraft at Low Earth Orbit initially, and later it will be more elliptical.

The spacecraft would be launched towards the Lagrange L1 point using on-board propulsion so that it exits the earth’s gravitational Sphere of Influence and cruises towards the L1. Later, it would be injected into a large Halo Orbit around L1 point near the Sun.

The total time from launch to reaching the L1 point would be about four months for the Aditya-L1 Mission, ISRO said.

Explaining the reasons to study the Sun, ISRO said it emits radiation in nearly all wavelengths along with various energetic particles and magnetic fields.

The atmosphere of the Earth as well as its magnetic field acts as a protective shield and blocks harmful wavelength radiations. In order to detect such radiation, solar studies are carried out from space.

The major objectives of the mission include understanding the Coronal Heating and Solar Wind Acceleration, the initiation of Coronal Mass Ejection (CME), near-earth space weather and the solar wind distribution.

The Aditya-L1 mission carries seven scientific payloads to carry out the study.

The Visible Emission Line Coronagraph (VELC) will study the solar corona and dynamics of CME.

VELC, the primary payload will be sending 1,440 images per day to the ground station for analysis on reaching the intended orbit.

It is “the largest and technically most challenging” payload on Aditya-L1.

The Solar Ultraviolet Imaging Telescope would do imaging of the Solar photosphere and Chromosphere in near Ultraviolet and measure the solar irradiance variations.

The Aditya Solar Wind Particle Experiment (ASPEX) and Plasma Analyser Package for Aditya (PAPA) payloads will study the solar wind and energetic ions as well as the energy distribution.

The Solar Low Energy X-ray Spectrometer and the High Energy L1 Orbiting X-ray Spectrometer (HEL1OS) will study the X-ray flares from the Sun over a wide X-ray energy range.

The Magnetometer payload is capable of measuring interplanetary magnetic fields at the L1 point.

The payloads of Aditya-L1 are indigenously developed with the close collaboration of various centers of ISRO.

source/content: telegraphindia.com (headline edited)

The rover will carry out in-situ chemical analysis of the lunar surface during the course of its mobility.

Chandrayaan-3 mission’s Lander Module which touched down on the lunar surface, has rolled out the rover, Pragyan, with ISRO saying “India took a walk on the moon”.

On its official X handle, ISRO said the “rover ramped down.”

“Chandrayaan-3 ROVER: Made in India–Made for the Moon! The Ch-3 Rover ramped down from the lander and India took a walk on the moon!,” it said.

President Droupadi Murmu congratulated the ISRO team for the successful deployment of Pragyan. “Its rolling out a few hours after the landing of Vikram marked the success of yet another stage of Chandrayaan 3. I look forward with excitement, alongside my fellow citizens and scientists, to the information and analyses that Pragyan will acquire and enrich our understanding of the moon”, she said.

In a precision landing, Chandrayaan 3’s LM Vikram touched down on the lunar surface at 6.04 pm on Wednesday, sending the nation into wild celebrations.

The ISRO had earlier said the 26 kg six-wheeled rover was scheduled to descend from the lander’s belly, onto the Moon’s surface, using one of its side panels as a ramp. The lander (Vikram) and rover (Pragyan) — with a total mass of 1,752 kg — are designed to operate for one lunar daylight period (about 14 Earth days) to study the surroundings there.

However, ISRO officials do not rule out the possibility of them coming to life for another lunar day.

The rover will carry out in-situ chemical analysis of the lunar surface during the course of its mobility. Both the lander and the rover have scientific payloads to carry out experiments on the lunar surface.

The rover would study the surface of the moon through its payload APXS – Alpha Particle X-Ray Spectrometer – to derive the chemical composition and infer mineralogical composition to further enhance understanding of the lunar surface.

Pragyan also has another payload–Laser-Induced Breakdown Spectroscope (LIBS) to determine the elemental composition of lunar soil and rocks around the lunar landing site.

ISRO Chairman S Somnath had earlier said, “After powered descent (of lander) onto the landing site, there will be deployment of ramp and rover coming out. After this, all the experiments will take place one after the other — all of which have to be completed in just one day on the moon, which is 14 days.”

source/content: newindianexpress.com (headline edited)

First country to reach the lunar south pole l Fourth nation after Russia, the US and China to successfully land on moon l flawless touchdown at 6.04 pm l landing process lasted 17 minutes.

India on Wednesday scripted history in golden letters after recording the first-ever soft landing at the Moon’s south pole. With this landing, exactly at 6.04 pm, India also became only the fourth country to have soft-landed on the lunar surface after the US, the erstwhile Soviet Union, and China. Chandrayaan-3’s record-setting success comes four days after Russia’s lunar mission Luna-25 crashed on August 19, just two days before its scheduled touchdown near the lunar south pole attempting to be the first to do so. That record now lies with Chandrayaan-3 of the Indian Space Research Organisation (ISRO). 

The Chandrayaan-3’s lander Vikram began its powered descent at 5.47 pm from an altitude of 30 km. It completed all four landing phases of rough braking, altitude hold, fine braking and terminal descent in an error-free manner, as planned and sticking to their respective deadlines.

The powered descent of Vikram Lander lasted 17 minutes filled with tension as it was during this phase that Chandrayaan-2 had lost its lander in September 2019. “Chandrayaan-3 chose a relatively flat region on the lunar surface,” ISRO wrote on micro-blogging site X (formerly Twitter).

It touched down between Manzinus C and Simpelius N craters near the lunar south pole .

Agony and ecstasy

The entire community of ISRO scientists, including some former ISRO heads who had gathered at the Mission Operations Complex (MOX) at ISRO Telemetry, Tracking and Command Network (ISTRAC) in Bengaluru, exulted in jubilation as Vikram landed.

“Sir, we have achieved a soft landing on the Moon. India is on the Moon,” said an overwhelmed ISRO chairman S Somanath, seconds after lander Vikram touched down on the Moon while addressing Prime Minister Narendra Modi, who virtually joined to witness the historic moment from South Africa where he is attending the BRICS Summit. 

The thunderous applause echoed from inside the MOX and merged with the resounding applause at the press enclave at ISTRAC premises amid loud cheers of Bharat Mata ki Jai and Vande Mataram. 
The scientists inside MOX, who had watched the tense moments of ‘terror’ of the lander’s power descent after the last command from the Earth station at 5.47 pm, broke out into thunderous applause. It was a complete meltdown of emotions, perseverance, a lot of hard work and celebrations. 

“It was a flawless mission,” said Somnath while describing the mission so far until the soft landing was achieved. He described it as “an incremental progress” while crediting the preceding mission, Chandrayaan-2, which failed to achieve a successful soft-landing due to an anomaly in the thrusters while attempting to land on September 7, 2019, leading to its crash.

Chandrayaan-3 is an improvement on Chandrayaan-2 while its objectives remain the same. “It was not an easy task in the last four years. There was a lot of agony and learning from Chandrayaan-2, which helped us in perfecting the methodology for soft-landing. It was a flawless landing. The velocity (of the lander) was reduced to less than two metres per second (during the powered descent),” he said.

Somanath named and invited the scientists behind Chandrayaan-3 — project director  P Veeramuthuvel, mission operation director M Srikanth, associate project director K Kalpana, and U R Rao Satellite Centre director M Sankaran — to address the media.

Why south pole

Several missions from various countries, including India, Russia, Japan, and Israel have attempted landing near the lunar south pole but failed.

The significance of the lunar south pole is that it holds promise for setting up future human bases. While the region has been screened from orbit by various orbiting missions, including Chandrayaan-2, which continues to be in a lunar orbit, none has been able to land to conduct on-site experiments and studies of the lunar environment at and around the Moon’s south pole. The region is understood to hold abundant water ice and mineral resources that can sustain human bases in the future.

Vikram will deploy its rover Pragyaan to conduct on-site studies. Somanath said Pragyaan will be deployed from the lander in the “next few hours or even a day, looking at the surface conditions. It will operate on the lunar surface for 14 Earth days and gather valuable scientific data”, which would be relayed back to the Deep Space Network centre at Byalalu near Bengaluru for analysis.

The lander’s mission is planned to be over 14 days (one lunar day), during which the lander’s three payloads and the rover’s two payloads will be active to conduct the studies of the lunar environment. Explaining the various components used in the Moon mission, he said all of them were developed in the country. He added that the lander does have some instruments provided by some countries to conduct tests on the Moon’s surface. 

Beginning of multiple space explorations

ISRO chief Somanath said Chandrayaan-3’s success means a lot to ISRO and marks the beginning of multiple space explorations starting with ‘Aditya L1’ to study the corona of the Sun early next month. ISRO aims to explore Mars, Venus and other planets and asteroids, he added

5-watt signal amplifier

Chandrayaan-3 is the product of teamwork with several scientists, technicians, and entrepreneurs among others joining hands to make it a success. ISRO’s associate director Dr B H M Darukesha and his team had developed a 5-watt signal amplifier for communication — an important part of Chandrayaan-3’s lander and rover — when no other country came forward to provide it to India since amplifiers are mostly used by the military. Click here to read more…

Rover’s desi cameras

The Pragyaan rover has two cameras which would be its eyes compared to foreign space agencies that use expensive cameras. The software in the rover has been developed by a Noida-based start-up, Omnipresent Robot Technologies. The images captured by the rover would generate a 3-D map of the lunar landscape. It also has a spectrometer to determine the chemical composition of the surface.

Nationwide contributions to Chandrayaan-3

On the day India celebrated the successful mission of Chandrayaan 3, Hyderabad-based Mishra Dhatu Nigam Limited (MIDHANI), took a quiet bow for its contribution in the form of top-tier strategic materials that bolster India’s defence, space, energy, and allied industries. The company’s contribution to the Chandrayaan 3 mission is one of many key roles it has played in India’s scientific and technological advancements. Click here to read more…

Telangana’s Gadwal, once considered among the most underdeveloped regions in the country, has emerged as a source of pride with the remarkable achievement of Kummari Krishna, who played a pivotal role in the successful execution of the Chandrayaan-3 mission. Click here to read more om Krishna’s contribution to the moon mission.

source/content: newindianexpress.com (headline edited)

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