July 3, 2022

PSLV-C52/ EOS-03 mission successful; Isro places three satellites in orbits – Times of India

CHENNAI: The Indian Space Research Organisation opened its 2022 account with the successful launch of radar imaging satellite EOS-04 and two others onboard PSLV-C52 on Monday morning.
The launch comes nearly six months after the failed GSLV-F10/EOS-03 mission. According to Isro, the cryogenic upper stage ignition did not happen due to a technical anomaly during the GSLV-F10/EOS-03 launch on August 12, 2021.
At 5.59am on Monday, PSLV-C52 lifted off from the first launch pad at Satish Dhawan Space Centre in Sriharikota with three satellites, including its primary payload EOS-04 radar imaging satellite. Around 17 minutes after lift-off, EOS-04 satellite was placed in a sun synchronous orbit. A minute later, the rocket injected the two other satellitesINS-2TD and Inspiresat-1.
Around four minutes later – that is 22 minutes after lift-off — the fourth stage was passivated to remove remaining propellants, with mixed oxides of nitrogen (MON) passivation followed by mono methyl hydrazine (MMH) passivation, two propellants that power PSLV’s upper stage. The passivation lasted for 10 minutes. Passivation is the removal of any leftover fuel in the rocket to prevent the explosion of rocket upper stages. The upper stage either performs an idle burn or vent the remaining propellants.
The mission was PSLV’s 54th flight and 23rd mission using PSLV-XL configuration with six PSOM-XLs.
Congratulating the team, Isro chairman S Somanath said, “The primary satellite, EOS-04, has been put in a very precise orbit by PSLV-C52. Co-passenger satellites INS-2TD and INSPIREsat-1 have also been placed in the right orbits. This spacecraft is going to be one of the biggest assets to serve the country. We will be back again with another launch of PSLV very soon.”
Satellite director Srikanth said, “Let me first congratulate the PSLV team on precise inject of EOS-04. The launch has rejuvenated Isro team once again. The most awaited spacecraft, EOS-04, is an earth observation mission, all weather, day and night imaging SAR mission with indigenously developed state-of-the-art technology SAR and will serve the country in the sectors of agriculture, soil moisture, disaster management, disaster assessment, carbon inventory, forest and plantation management and many more sectors.”
“The health of EOS-04 is perfectly fine after separation. I am happy to share that the solar panels are deployed autonomously and started generating the designed power…. In a couple of days after calibration and braking for outgassing, the satellite will be ready to deliver the glimpse of images. The services will be an integral part of many governmental services. EOS-04 has taken a small step in the nation’s dream of opening the space sector with the industry participation in the form of build to print and also assemble and test. We have fairly succeeded in our effort.”
Satellites
EOS-04, a radar imaging satellite with a mission life of 10 years, is designed to provide high quality images under all weather conditions for applications like agriculture, forestry and plantations, flood mapping, soil moisture and hydrology. Collecting earth observation data in C-band, it complements/supplements the data from Resourcesat, Cartosat series and RISAT-2B series.
INS-2TD is a technology demonstrator from Isro with a mission life of six months, which is a precursor to the India-Bhutan joint satellite (INS-2B). Having a thermal imaging camera as its payload, the satellite benefits from the assessment of land surface temperature, water surface temperature of wetlands/lakes, delineation of vegetation (crops and forest) and thermal inertia (day/night).
Inspiresat-1 is a student satellite with a mission life of one year developed by Indian Institute of Space Science and Technology (IIST), in association with University of Colorado in the US. Other contributions are NTU, Singapore and NCU, Taiwan. Two scientific payloads improve the understanding of ionosphere dynamics and the sun’s orbital heating processes.

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