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Countdown begins for PSLV-C56/DS-SAR mission starts Sunday, tomorrow

IndiaCountdown begins for PSLV-C56/DS-SAR mission starts Sunday, tomorrow

The countdown for the exclusive commercial launch of PSLV-C56 carrying Singapore’s DS-SAR satellite and six co-passenger satellites begins.

The countdown started at the Sriharikota spaceport on Saturday morning, with a 25.5-hour timeline. The 44.4-meter tall PSLV-C56, a four-stage vehicle with a lift-off mass of 228 tonnes, is scheduled to take off from the First Launch Pad at 06:30 hrs on Sunday morning from the SHAR Range. The commencement of the countdown was announced by ISRO at 0500 hrs on Saturday through a tweet stating the launch time as July 30, 2023, at 06:30 Hrs IST.

During the countdown, propellant filling operations will be conducted in the four-stage vehicle. PSLV-C56 is configured in its core-alone mode, similar to the C55 launch, without the use of strap-on motors.

The primary payload, DS-SAR, a 360 kg Radar Imaging Earth Observation satellite, will be launched into a Near-equatorial Orbit (NEO) at 5 degrees inclination and 535 km altitude. This mission, PSLV-C56/DS-SAR, is the dedicated commercial venture of NewSpace India Limited (NSIL) for ST Engineering, Singapore. Additionally, there are six co-passenger customer satellites from Singapore, all of which will be injected into a 535 km circular orbit with 5 degrees of orbital inclination, as stated by ISRO.

This marks the 58th flight of PSLV and the 17th flight of its Core Alone configuration. Approximately 21 minutes after lift-off, following the ignition and separation of all four stages, the primary satellite DS-SAR will separate from the launch vehicle and be placed into orbit. Subsequently, in a span of four minutes, the six co-passenger satellites, namely Nulion, ORB-12 STRIDER, Galassia-2, SCOOB-II, Arcade, and VELOX-AM will be sequentially separated and injected into the orbit.

The entire mission is expected to last around 25 minutes. After successfully deploying all the satellites, the upper stage (4th stage) of the rocket will be placed in a lower orbit to reduce its orbital life. ISRO explained that the spent PS4 stage will be de-orbited to a Low Earth circular orbit with dimensions of 300 x 300 km, using the remaining propellants to ensure a controlled reduction of its orbital lifespan.

What is PSLV-C56/DS-SAR?

PSLV-C56/DS-SAR refers to the specific mission of the Polar Satellite Launch Vehicle (PSLV) designated as C56, which is aimed at launching the DS-SAR satellite into space. DS-SAR stands for “Radar Imaging Earth Observation Satellite” and is the primary payload of this mission. The launch is part of a dedicated commercial venture of NewSpace India Limited (NSIL) for ST Engineering, Singapore. Along with DS-SAR, there are also six co-passenger satellites from Singapore that will be launched into orbit as part of this mission. The PSLV-C56/DS-SAR mission is designed to place these satellites into a Near-equatorial Orbit (NEO) at 5 degrees inclination and an altitude of 535 km.

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