Issue 71

India Launches Satellites for Singapore

21 Apr 2023: Indian Space Research Organization (ISRO) launched a 4-stage PSLV rocket to deploy a pair of Singaporean satellites in a commercial launch contracted by its subsidiary NewSpace India Limited. The launch carried the TeLEOS-2 radar-imaging satellite, to be operated in partnership between the government of…

21 Apr 2023: Indian Space Research Organization (ISRO) launched a 4-stage PSLV rocket to deploy a pair of Singaporean satellites in a commercial launch contracted by its subsidiary NewSpace India Limited. The launch carried the TeLEOS-2 radar-imaging satellite, to be operated in partnership between the government of Singapore and ST Electronics. The smaller Lumelite-4 satellite was also deployed, while seven additional payloads rode attached to PSLV’s upper stage, which will remain in orbit as an experimental platform after completing the deployment of the two satellites.Launch Video.

– TeLEOS-2 is a synthetic aperture radar (SAR) satellite, capable of imaging the Earth without being affected by darkness or cloud cover. TeLEOS-2 uses the same bus as its predecessor, TeLEOS-1 (Dec 2015), but with the SAR payload installed instead of the electro-optical system aboard the earlier satellite.

– The launch also carried the Lumelite-4 to orbit. Lumelite-4 is a 12-unit CubeSat carried for the Agency for Singaporean industrial and government partners. With dimensions of 20x20x30cm and a mass of 16kg, it will be used for an on-orbit demonstration of a space-based VHF Data Exchange System (VDES) for maritime users.

– The PSLV’s upper stage will remain in orbit to host an array of experiments. Named PSLV Orbital Experimental Module 2 (POEM-2) in this role, the stage is equipped with solar panels and seven non-deployable experiment packages. It is expected to operate in this role for around a month.

– All three satellites are in a 588x618km x 9.9° orbit.

– The PSLV, or Polar Satellite Launch Vehicle, is a four-stage rocket built and operated by the Indian Space Research Organisation (ISRO). Introduced in September 1993, it has made 56 flights prior to the TeLEOS-2 mission, with 53 of these completed successfully, two failing and one resulting in a partial failure with an off-nominal orbit attained. Saturday’s launch, designated PSLV C55, will aim to continue the rocket’s current run of 15 consecutive successful missions.

-The PSLV C55 mission marked the first use of a new integration process, taking advantage of a new mobile launch pedestal (MLP), to support a PSLV mission from the First Launch Pad. Previously, PSLV rockets launched from the FLP have been built up at the launch pad, but

with the new pedestal their lower stages can be pre-assembled at a nearby PSLV Integration Facility (PIF) before they are transferred to the pad. ISRO hopes that this will allow future launch campaigns to be run in parallel.

TeLEOS-2 prepared for launch

TeLEOS-2 mission orbit