ISRO’s PSLV-C53 successfully places satellites in target orbit

The Indian Space Research Organization (ISRO) successfully launched PSLV-C53/DS-EO on Thursday from the Satish Dhawan Space Center in Sriharikota, with the ISRO’s power-horse rocket placing the satellites precisely in their intended orbit.

This was NewSpace India Limited’s (NSIL) special commercial mission, designed to launch the DS-EO satellite into orbit along with two other fellow passenger satellites from ST Electronics, Singapore.

At 6:02 PM, ISRO’s workhorse PSLV zoomed into the sky from the second launch pad with three satellites: DS-EO, a 365 kg satellite, and NeuSAR, a 155 kg satellite, both from Singapore and built by Starec Initiative, Republic of Korea. The third was a 2.8kg Scoob-1 from Nanyang Technological University, Singapore.

55th mission of PSLV

This was the 55th mission of PSLV and the 15th mission with the PSLV-Core Alone variant. It is the 16th PSLV launch from the second launch pad. The mission proposes to demonstrate the use of the used upper stage of the launch vehicle as a stabilized platform for scientific payloads after the separation of the satellites, an ISRO release says.

The four-stage 44.4 m high PSLV-C53 had a launch mass of 228,433, and a precision-injected DS-EO satellite orbiting at an altitude of 570 km measured from the equator.

PSLV Orbital Experimental Module (POEM) DS-EO has an electro-optical, multispectral charge with an imaging capability of 0.5 m resolution. The POEM activity conducts in-orbit science experiments using the used PS4 stage as an orbital platform. It is the first time that the PS4 stage orbits the Earth as a stabilized platform.

POEM gets the power from the solar panels mounted around the PS4 tank and a Li Ion battery. It navigates using four solar sensors, a magnetometer, gyroscopes and NavIC. It has special steering propellers that use helium gas storage. It is enabled with the telecommands feature.

POEM has powered six payloads, including two from Indian Space Start-ups Digantara and Dhruva Aerospace, through IN-SPACe and NSIL.

After the successful launch, ISRO chairman S Somnath, speaking from the mission control room, said that PSLV-C53 has placed NSIL’s client satellites in the precise 570 km orbit. This is another important mission in June following the successful launch of the Indian communications satellite GSAT-24 by Arianespace from Kourou in French Guiana on June 22.

In today’s mission, all three satellites were placed in the correct orbit, and further activities of the satellites will be picked up and the mission will be a complete success for customers. The orbital experimental module will be functional after launch by taking over the fourth stage from the primary mission computer to another computer, which continues from there. The fourth phase of PSLV will be one that generates energy on board and stabilizes it with altitude control and also certain experiments organized by some of the startups, he said.

Mission Director, SR Biju, said: “PSLV was in a different configuration this time – Core Alone – and we are coming back to SLP with this variant after a long time. Certain changes had to be made to improve the production of PSLV in order to to meet growing customer demand, and the changes that have been implemented have paid off, he said.

published on

June 30, 2022

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