DS-EO & others | PSLV-CA 

Lift Off Time
June 30, 2022 – 12:32 UTC | 18:02 IST
Mission Name
DS-EO & others
Launch Provider
(What rocket company launched it?)
Indian Space Research Organization (ISRO)
Polar Satellite Launch Vehicle (PSLV)
Launch Location
Second Launch Pad, Satish Dhawan Space Centre, Sriharikota, Republic of India
Payload mass
~523 kg
Where did the satellites go?
570 km Low Earth Orbit (LEO), at 100° inclination
Did they attempt to recover the first stage?
No, this is not a capability of PSLV
Where did the first stage land?
It crashed into the Indian Ocean
Did they attempt to recover the fairings?
No, this is not a capability of PSLV
Were these fairings new?
This was the:
– 2nd dedicated commercial mission of NewSpace India Limited (NSIL)
– 15th mission using PSLV-Core Alone variant
–16th PSLV launch from the Second Launch Pad
– 55th mission of PSLV

– 75th orbital launch attempt (72nd successful)
Where to re-watch
Official replay

How Did It Go?

The Indian Space Research Organization’s Polar Satellite Launch Vehicle (PSLV) successfully launched the DS-EO & others mission from the Second Launch Pad at Satish Dhawan Space Centre, Sriharikota, India. The rocket carried the DS-EO Earth-observation satellite to orbit, together with two secondary payloads: NeuSAR and SCOOB-I satellites.

DS-EO & others Mission

The DS-EO is an electro-optical and multispectral Earth-observation satellite that belongs to Singapore and was built by Starec Initiative. The satellite has a mass of 365 kg and aims at providing full-colour images with a resolution of 0.5 m for land classification. It will help in humanitarian assistance and disaster relief needs.

Moreover, the DS-EO & others mission carried two secondary payloads: NeuSAR and SCOOB-I satellites. The former has a mass of 155 kg and was also built by Starec Initiative. It is Singapore’s first small commercial satellite carrying a SAR payload, which means that the satellite will be able to provide images 24/7 and under all weather conditions.

The SCOOB-I satellite has a mass of 2.8 kg and was developed by Nanyang Technological University (NTU) in Singapore. It is the first satellite built within a student training program called Student Satellite Series (S3-I).

What Is The PSLV?

India’s Polar Satellite Launch Vehicle comes in several variants. These are:

  • PSLV-G

This flight is a PSLV-CA flight, meaning that it will use the core alone version that features no side boosters. Without these strap-on boosters, the PSLV is a four stage rocket, using a variety of propellants.

India's PSLV-CA launch vehicle.
India’s PSLV-CA launch vehicle. (Credit: ISRO)

Stage One (PS1)

The first stage is 20 m tall, and 2.8 m wide. It uses hydroxyl-terminated polybutadiene (HTPB) propellant, using an S139 solid rocket motor. This stage has a 110 second burn time, with the motor featuring an efficiency of 137 seconds ISP (at sea level). It has a maximum thrust of 4800 kN.

Stage Two (PS2)

The second stage is 12.8 m tall, and 2.8 m wide. It uses Unsymmetrical dimethylhydrazine (UDMH) as fuel and N2O4 as oxidiser. The Vikas engine on this stage was developed by the Liquid Propulsions Systems Centre. The motor runs for a burn time of 133 seconds, with the engine having an efficiency of 293 seconds ISP.

PSLV rocket at launch, March 31, 2019.
PSLV rocket at launch, March 31, 2019. (Credit: ISRO)

Stage Three (PS3)

The third stage is 3.6 m tall, and 2 m wide. It uses HTPB solid propellant, similar to the first stage, and features an S-7 engine. This stage runs for 83 seconds burn time, and the motor has an efficiency of 295 seconds ISP. Maximum thrust on this stage is 240 kN.

Stage Four (PS4)

The last stage is 3 m tall, and only 1.3 m wide. This is a liquid-fuelled stage, using monomethylhydrazine (MMH) for fuel and mixed oxides of nitrogen (MON) for oxidiser. The stage has two PS-4 engines, each of which produce 6.6 kN of thrust. The stage runs for 525 seconds of burn time, and has an efficiency of 308 seconds ISP.

Moreover, the DS-EO & others mission used the spent fourth stage as an orbital platform designated as the PSLV Orbital Experimental Module (POEM) to conduct in-orbit experiments. The POEM carried six scientific payloads, two of them from Indian start-ups: Bengaluru’s Digantara and Hyderabad-based Dhruva Space. Digantara launched an extremely small (less than 1 cm in size) weather sensor that uses the ROBI (ROBust Integrating proton fluence metre) technology to solve the shortage of empirical space weather data. Dhruva Space will demonstrate its satellite deployer technology that will be used for CubeSats deployment in the future.

The POEM platform is powered by solar panels that can be found around the PS4 tank and a lithium-ion battery. It navigates using a magnetometer, four sun sensors, gyros, and NavIC. Moreover, the platform is equipped with dedicated control thrusters that use helium.

Rocket section adapted from Andy Law.

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