ISRO successfully places EMISAT, 28 other international satellites in orbit in triply-special PSLV-C45 mission

The Indian Space Research Organisation(ISRO) successfully completed the PSLV-C45/EMISAT mission this morning starting with a “perfect launch” from the SHAR in Sriharikota at 9.27 am.
PSLV-C45 — carrying Emisat, 28 foreign satellites, and three scientific instruments — lifted off from the second launch pad at Satish Dhawan Space Centre in Sriharikota at 9.27am. Around 17 minutes after lift-off, PSLV placed Emisat in an orbit in a 753.6km altitude.
The mission placed an Indian electronic spy satellite developed jointly by ISRO and the Defense Research and Development Organisation (DRDO), EMISAT, and 28 other cube- and nanosatellites from Lithuania, Spain, Switzerland, and the USA.
In the next 1.5 hours, the launch vehicle’s fourth and final stage — PS4 — restarted and shut down twice, as the rocket maneuvered to a 504km orbit. Around two hours after the mission started, the PS4 placed 28 foreign satellites — belonging to the US, Lithuania, Spain, and Switzerland – in their orbits.
It was the Polar Satellite Launch Vehicle’s 47th flight and was one of the longest missions of the launch vehicle around the Earth, lasting nearly three hours. The previous longest mission was that of PSLV-C40 in January 2018 which lasted two hours and 21 minutes.
A new variant of the Polar Satellite Launch Vehicle (PSLV), the PSLV-QL, lifted off from the Satish Dhawan Space Center in Sriharikota with the 29 payloads and placed them in three different orbits over the 180-minute-mission, which is something ISRO attempted (and succeeded at) for the first time.

The PSLV-C45/EMISAT mission is also special for ISRO in other ways. It is the first test of the PSLV-QL rocket variant, which has 4 additional strap-on PSOM-XL boosters to give it a huge additional thrust during liftoff. The mission will also host three experiments from Indian students and startups in the rocket’s “still-alive” fourth stage (PS-4). The PS-4 has been adjusted into a suitable orbit at a ~480km altitude so it can sustain three experiments inside it for 5-6 months in microgravity.
These experiments include an Automatic Packet Repeating System (APRS) from AMSAT (Radio Amateur Satellite Corporation), India, an Advanced Retarding Potential Analyzer for Ionospheric Studies (ARIS) from Indian Institute of Space Science and Technology (IIST) in Kerala and an Automatic Identification System (AIS), from ISRO.

Here’s a look at the PSLV-C45 mission at a glance.
According to ISRO, a new variant of the rocket PSLV-QL equipped with four Strap-On motors in the first stage is used for the launch. PSLV, also used in India’s two key missions, “Chandrayan” in 2008 and Mars Orbiter in 2013, is a reliable and versatile launch vehicle for ISRO with 39 consecutive successful flights till June 2017 and five-in-a-row from January 2018.
The rocket has encountered only two failures so far, its maiden developmental flight ended unsuccessful way back in 1993.
The other 28 international satellites — 25 3U type, two 6U type, and one 2U type nanosatellites — are from Lithuania (two), Spain (1), Switzerland (1) and the United States (24).
All these satellites are being launched under commercial arrangements, ISRO said.
In September 2017, the flight went off without any hitch but the IRNSS-1H Satellite could not be released into orbit after the PSLV-C39’s heat shield failed to open on reaching the orbit.
In this mission, ISRO scientists would place the satellites and payloads in three different orbits, a first for the agency. After injecting the 436 kg primary satellite EMISAT, intended for electromagnetic spectrum measurement, at around 17 minutes from lift off in a 749 km orbit, they would restart the fourth stage again. This is the second time that Isro is converting PS4 as a satellite-like orbital platform. On January 24, PSLV-C44 carried a student satellite in its PS4 which was alive for several hours — powered by batteries — helping the payload conduct microgravity tests.
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Source:-.businesstoday and times of India