NASA, ISRO gearing up to launch joint space mission to map globe every 12 days
Bengaluru (PTI): The NASA-ISRO Synthetic Aperture Radar (NISAR) is set to be launched in the first quarter of 2024 after a few tests, particularly those related to vibration, NASA officials have said.
"ISRO is projecting the first quarter of next year. So, I mean, that's ready," NASA NISAR Project Manager Phil Barela said during a media interaction here on Wednesday.
He is expecting the launch of NISAR (spelt as 'Naisar') "not earlier than January" from the Satish Dhawan Space Centre at Sriharikota aboard the ISRO Geosynchronous Satellite Launch Vehicle Mark-II.
The mission, which has three-year duration, aims to survey all of Earth's land and ice-covered surfaces every 12 days. This will start after a 90-day satellite commissioning period.
Regarding the key tests that are pending to be undertaken, Barela said, "The vibration testing that's underway, but there's a whole slew of performance tests that we need to do."
Battery and simulation tests have to be done to make sure that the system works fine, he said.
"...we'll be doing performance testing on the radars and various spacecraft electronics. So, a lot of testing remains but the big environments test, the only one remaining now, is vibration," Barela said.
NASA Jet Propulsion Laboratory Director Dr Laurie Leshin said the NISAR project is "better than anything that was flown in the past".
"While there are datasets from past missions that can form sort of a baseline, this is a new level of capability that we will have with NISAR," she had told reporters on Tuesday.
"If it's working very well, we will almost certainly extend that mission to get that longer baseline. It is a very important thing to see the Earth change on multi-year timescales. This is what we are looking for," Leshin had said.
According to ISRO, NISAR is a Low Earth Orbit (LEO) observatory being jointly developed by it and NASA.
NISAR will map the entire globe in 12 days and provide spatially and temporally consistent data for understanding changes in the Earth's ecosystems, ice mass, vegetation biomass, sea level rise, ground water and natural hazards, including earthquakes, tsunamis, volcanoes and landslides.
In a handout, NASA said the project aims to understand the dynamics of carbon storage and uptake in wooded, agricultural, wetland and permafrost ecosystems and the response of ice sheets to climate change, the interaction of sea ice and climate, and impacts on sea level rise worldwide.
NISAR will have Synthetic Aperture Radar Instrument (SAR), L-band SAR, S-band SAR and Antenna reflector.
According to NASA, the onboard instruments can even see a minor change of even one centimetre from space.
The SUV-size satellite has a mass of roughly 2,800 kg, which will be powered by two solar arrays providing about four kilowatts of power.
The six feet tall spacecraft bus' will contain the command and communication systems for the instrument payload, which houses the two SAR instruments.
"The bus' will also support the radar antenna reflector and its boom. There is enough fuel aboard to support at least five years of operations," the handout said.
Let the Truth be known. If you read VB and like VB, please be a VB Supporter and Help us deliver the Truth to one and all.
Congress cites Maniben Patel's diary entries, asks Rajnath to apologise for Babri claim
New Delhi (PTI): The Congress on Saturday shared diary entries of Vallabhbhai Patel's daughter from a book to rebut Defence Minister Rajnath Singh's claim that India's first prime minister, Jawaharlal Nehru, wanted to build the Babri masjid using public funds, and demanded that Singh apologise for spreading "falsehoods".
Congress general secretary in charge of communications, Jairam Ramesh, claimed the defence minister was spreading falsehoods to “improve his relationship” with Prime Minister Narendra Modi.
“Here is Maniben's original diary entry in Gujarati on pages 212-213 in the book ‘Samarpit Padchhayo Sardarno’ by CA R S Patel 'Aaresh', published by Sardar Patel Vallabhbhai Patel Memorial Society, 2025,” Ramesh said on X, sharing screenshots of the relevant pages from the book.
“There is a huge difference between what is contained in the original diary entry and what Rajnath Singh ji and his fellow ‘distorians’ are propagating,” Ramesh said.
“The Defence Minister must apologise for the falsehoods he is spreading, simply to improve his relationship with the PM,” he claimed.
The Congress had earlier termed Singh's claim that Nehru wanted to build the Babri masjid using public funds a “lie” and “WhatsApp university story”, and said the defence minister should not walk in Prime Minister Narendra Modi's path.
Addressing a gathering at Sadhli village in Gujarat's Vadodara district last Tuesday, Singh said Nehru wanted to build the Babri masjid using public funds, but Sardar Vallabhbhai Patel didn't allow his plans to succeed.
The BJP had cited a book by Vallabhbhai Patel's daughter to double down on Singh's claims, and said the first prime minister also said he felt "repelled" by some of the temples in south India despite their beauty.
“The source of what Rajnath Singh said is the 'Inside Story of Sardar Patel, Diary of Maniben Patel'," BJP Rajya Sabha MP and national spokesperson Sudhanshu Trivedi had said at a press conference at the party headquarters while responding to media queries on the issue.
Trivedi claimed that on Page 24 of the book, it is written that Nehru also raised the question of the Babri mosque, but Sardar Patel made it clear that the government could not spend any money on building a mosque.
