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In second commercial mission, ISRO to launch 3 Singapore satellites

The POEM activity will perform in-orbit scientific experiments using the spent PS-4 stage as an orbital platform.

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Chennai: In its second dedicated commercial mission,
the Indian Space Research Organisation (ISRO) will launch three
Singapore Satellites by workhorse launch vehicle PSLV from the
a spaceport of Sriharikota, about 100 km from here, on June 30.

ISRO sources said the PSLV-C53, carrying the 365 kg DS-EO satellite
and two other co-passenger satellites will lift off from the Second Launch
The pad at 1800 hrs on Thursday evening.

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The 25-hour countdown leading to the launch will begin at 1700 hrs

PSLV-C53 is the second dedicated commercial mission of NewSpace
India Limited (NSIL). It is designed to orbit the DS-EO satellites along with
two other co-passenger satellites from Singapore.
This is the 55th mission of PSLV and the 15th mission using PSLV-Core
alone variant.

It is the 16th PSLV launch from the Second Launch Pad.
The mission proposes to demonstrate the utilization of the spent upper
stage of the launch vehicle as a stabilized platform for scientific payloads
subsequent to the separation of the satellites.

The four-stage, 44.4 m tall PSLV-C53, has a lift-off mass of 228.433 tonnes.
ISRO said the PSLV-C53 would inject the DS-EO satellite into an orbit with
a semi-major axis of 6948.137 + 20 km, at an altitude of 570 km measured
from the equator, with a low inclination of 100 + 0.20.

PSLV-C53 carries three satellites–DS-EOand NeuSAR, a 155 kg satellite
both belonging to Singapore. The third satellite is a 2.8 kg Scoob-1 of
Nanyang Technological University (NTU), Singapore.

PSLV Orbital Experimental Module (POEM) DS-EO carries an electro-optic,
the multi-spectral payload that will provide full-color images for land classification and serving Humanitarian Assistance and Disaster Relief needs.

NeuSAR is Singapore’s first small commercial satellite carrying a SAR payload, which is capable of providing images in day and night and under all weather conditions.

SCOOB-I satellite is the first satellite in the Student Satellite Series (S3-I), a
hands-on student training program from the Satellite Research Centre (SaRC) at Singapore’s NTU School of Electrical and Electronic Engineering.

The POEM activity will perform in-orbit scientific experiments using the spent PS-4 stage as an orbital platform. It is for the first time that the PS-4 stage would orbit the earth as a stabilized platform.

“Attitude stabilization is achieved using a dedicated NGC system. POEM derives the power from the solar panels mounted around the PS4 tank and a Li Ion battery”, ISRO said, adding, that it navigates using four sun sensors, a magnetometer, gyros, and NavIC.

It carries dedicated control thrusters using Helium gas storage and is enabled with the telecommand feature. POEM carries six payloads including two from Indian Space Start-ups M/s Digantara and M/s Dhruva Space enabled through IN-SPACe and NSIL.

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