India's 'spy in the sky', EMISAT to be launched tomorrow

31 Mar 2019

India's 'spy in the sky', EMISAT to be launched tomorrow

Written by
Aakanksha Raghuvanshi

India

A 27-hour countdown began today for the launch of India's EMISAT satellite along with 28 nano-satellites of global customers from Sriharikota on Monday, a mission which would witness the ISRO placing payloads in three orbits and conducting space experiments for the first time.

The EMISAT, which is the country's latest observation satellite, is aimed at electromagnetic measurement.

Here are more details.
In this article
Four-stage PSLV-C45 will launch from Satish Dhawan Space Center Mission will mark several firsts to the credit of ISRO PSLV was used in 'Chandrayan' and 'Mass Orbiter' mission PSLV failed second time after its launch in September 2017 After injecting EMISAT, scientists would restart the fourth stage ISRO will for the first time provide a microgravity environment PSLV's fourth stage hosts three payloads in this mission Other 28 satellites are from Lithuania, Spain, Switzerland, the US ISRO recently launched GSAT-31 from the French Guiana
Details

Four-stage PSLV-C45 will launch from Satish Dhawan Space Center
The countdown began at 6:27 am (local time) for the launch on board Indian Space Research Organization's third generation workhorse Polar Satellite Launch Vehicle (PSLV), in its 47th flight, the space agency said.

The four-stage PSLV-C45 will blast off from the Second Launch Pad at the Satish Dhawan Space Center of Sriharikota at 9:27 am (local time) on Monday, the agency officials said.
Information

Mission will mark several firsts to the credit of ISRO
The mission marks several firsts to ISRO's credit. It would maneuver satellites in various orbits and orbital experiments, including on maritime satellite applications. A new variant of the rocket PSLV-QL, equipped with four Strap-On motors in the first stage, will be used for the launch.
Previous uses

PSLV was used in 'Chandrayan' and 'Mass Orbiter' mission
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 Jun'17 and five in a row from Jan'18.

The rocket has encountered only two failures so far. The first one was when its maiden developmental flight ended unsuccessful way back in 1993.
Failures

PSLV failed second time after its launch in September 2017
The second failure of PSLV occurred 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 tomorrow's mission, ISRO scientists would place the satellites and payloads in three different orbits, a first for the agency.
Process

After injecting EMISAT, scientists would restart the fourth stage
After injecting the 436kg primary satellite, EMISAT, intended for electromagnetic spectrum measurement, at around 17 minutes from lift off in a 749km orbit, the scientists would restart the fourth stage again.

During this initiative, all the other 28 customer satellites, totally weighing about 220kg, would be released by lowering the fourth state to around 504km orbit.
Fourth stage

ISRO will for the first time provide a microgravity environment
Again, the fourth stage would be reignited and further lowered to 485km orbit to serve as an orbital platform for carrying out spaceborne experimentations for the first time in ISRO's history.

According to ISRO, this is the first time it has been envisaged to provide a microgravity environment for research organizations and academic institutes to perform experiments.
PS4

PSLV's fourth stage hosts three payloads in this mission
The PS4, the fourth-stage of PSLV, hosts three payloads in this mission.

The first payload is the Automatic Identification System (AIS) from ISRO - for maritime satellite applications capturing messages transmitted from ships.

The second is the Automatic Packet Repeating System (APRS) from AMSAT (Radio Amateur Satellite Corporation), India - to assist amateur radio operators in tracking and monitoring position data.
Other satellites

Other 28 satellites are from Lithuania, Spain, Switzerland, the US
The third payload is Advanced Retarding Potential Analyser for Ionospheric Studies (ARIS) from Indian Institute of Space Science and Technology (IIST) - for the structural and compositional studies of the ionosphere.

The 28 international satellites, 25 3U-type, two 6U-type, and one 2U-type, are from Lithuania (two), Spain (1), Switzerland (1) and the US (24).

All these satellites are being launched under commercial arrangements.
Information

ISRO recently launched GSAT-31 from the French Guiana
The previous launches by ISRO this year include the imaging satellite Microsat-R for military purpose along with 1.2kg Kalamsat in January on board PSLV-C44. In February, ISRO launched India's communication satellite GSAT-31 from the European launch service provider Ariane from French Guiana.