Indian Space Research Organisation on Sunday successfully launched its proven Polar Satellite Launch Vehicle (PSLV) rocket carrying seven Singaporean satellites from Satish Dhawan Space Centre in Sriharikota and placed them into intended orbits.
Around 23 minutes after lift-off, the primary satellite got separated and it was followed by six other co-passenger satellites, which were deployed into the intended orbits sequentially, ISRO said.
This ISRO mission, which comes after the much-awaited Chandrayaan-3 launch earlier this month, is being undertaken by its commercial arm NewSpace India Limited (NSIL).
ISRO Chairman S Somanath said, "The PSLV-C56 carrying seven satellites including primary satellite DS-SAR and six co-passenger satellites have been successfully placed in the right orbits."
After the 25 hour countdown that commenced on Saturday concluded, the 44.4 metre tall rocket lifted off majestically from the first launch pad at this spaceport, one minute after the prefixed time of 6.30 am, emanating thick fumes on its tail.
The lift-off time which was scheduled for 6.30 am today was later revised to 6.31 am as space debris was expected on the path of the rocket during its journey to the orbit.
"Change of lift-off time occurs when space debris come in the path of rocket. That is what happened today," an ISRO official told PTI.
"This is the mission of the PSLV for NSIL and I want to congratulate the customers sponsored by Government of Singapore for having this mission on board PSLV and their continued faith in our PSLV for deploying the spacecrafts (satellites) from Singapore," Somanath said at the Mission Control Centre.
"Congratulations once again to NSIL for the Singapore satellites which have been onboard this mission and the very perfect orbit that this time we have got. But at this moment I thank all of you for watching this mission early morning this day and supporting us and congratulating us and we want to specifically tell you that we are going to come back with another PSLV mission soon in the month of August or early September" he said.
On the successful launch and separation of the satellites, ISRO posted on Twitter, 'PSLV-C56/DS-SAR Mission: The mission is successfully accomplished. PSLV-C56 vehicle launched all seven satellites precisely into their intended orbits. Thanks to @NSIL_India and Singapore, for the contract.'
NewSpace India Ltd Chairman and Managing Director D Radhakrishnan said, "My heartiest congratulations to team ISRO for the PSLV project across various centres for giving us such a marvelous and precise mission and I don't think the customer would have asked for anything better than what we have just seen in today's mission."
"I would say in the history of our PSLV launches, commercial launches for international customers, a single customer (Singapore government) coming to PSLV continuously four times for a dedicated launch has been a real record and that shows the kind of trust the customer has laid on the teams here. I am aware Singapore is planning many more missions in the future and they will continue to have trust on our services and the most reliable launcher, the PSLV that we have offered the service, and I am sure they will offer us many more opportunities for us to give them the best launch in the international community." he said.
In Sunday's dedicated commercial mission, the primary payload carried by ISRO's trusted workhorse PSLV is the DS-SAR Radar Imaging Earth Observation satellite, which has been developed under a partnership between DSTA (representing the Government of Singapore) and ST Engineering, Singapore.
The 360-kg satellite, upon deployment at an altitude of 535 km into a Near-equatorial Orbit (NEO), would be used to support the satellite imagery requirements of various agencies within the Government of Singapore.
ST Engineering would use the satellite for multi-modal and higher responsiveness imagery and geospatial services for their commercial customers.
The satellite carries a Synthetic Aperture Radar (SAR) payload developed by Israel Aerospace Industries. The payload allows DS-SAR to provide for all-weather day-and-night coverage and it is capable of imaging at 1-metre resolution.
The co-passenger satellites are 1. VELOX-AM,a 23 kg technology demonstration microsatellite, 2. ARCADE Atmospheric Coupling and Dynamics Explorer (ARCADE), an experimental satellite, 3. SCOOB-II, a 3U nanosatellite flying a technology demonstrator payload, 4. NULloN by NuSpace, an advanced 3U nanosatellite enabling seamless Internet of Things connectivity in both urban and remote locations, 5. Galassia-2, a 3U nanosatellite that would be orbiting at low earth orbit and 6. ORB-12 STRIDER, a satellite developed under an international collaboration, the Bengaluru-headquartered space agency said.
Sunday's mission is the 58th flight of PSLV and using the 17th vehicle with Core Alone Configuration.
According to the space agency, a Core Alone version of the rocket means the vehicle does not use solid strap-on motors on its sides in the first stage as compared to other variants like PSLV-XL, QL, and DL which use six, four or two boosters, respectively.
PSLV has earned its title as the 'Workhorse of ISRO' through consistently delivering various satellites into low earth orbits, ISRO said.
This is the second campaign to be undertaken by ISRO after the much awaited Chandrayaan-3 mission which was launched on July 14 from the second launch pad at Satish Dhawan Space Centre, Sriharikota.
Sriharikota is located about 135 km from Chennai on the eastern coast.
Currently, the Chandrayaan-3 spacecraft is undergoing orbit raising manoeuvres. On July 25, ISRO scientists successfully performed the fifth orbit-raising manoeuvre of the Chandrayaan-3 spacecraft setting the stage for the planned August 1 journey towards the Moon after leaving the orbit of the Earth.
Sunday's mission follows PSLV-C55/TeLEOS-2 mission, which was successfully launched in April to serve the customers in Singapore.
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