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Important Facts For Prelims


  • 11 Feb 2023
  • 3 min read

Why in News?

In its second attempt, the Indian Space Research Organisation (ISRO)’s smallest vehicle, Small Satellite Launch Vehicle (SSLV-D2), was launched from the Satish Dhawan Space Centre, Sriharikota, Andhra Pradesh.

  • The vehicle’s first development flight (SSLV D1) that took place in August 2022 failed to place the satellites in precise orbit.
  • This time structural changes have been made to the equipment bay, along with changes in the separation mechanism for stage 2, and logic changes for the on-board system.


  • A new vehicle is declared operational by ISRO after it completes two successful development flights.
  • The last vehicle to be declared operational was the GSLV Mk III, now called LVM 3, when it carried Chandrayaan-2 in 2019.

What’s Onboard in SSLV-D2?

  • SSLV-D2 will place the ISRO’s earth observation satellite EOS-07 and two co-passenger satellites - Janus-1 and AzaadiSat2.
    • Janus-1:
      • It is a technology demonstrator satellite built by US-based Antaris and its Indian partners XDLinks and Ananth Technologies.
      • It is a six-unit cube satellite with five payloads on board — two from Singapore, and one each from Kenya, Australia, and Indonesia.
    • AzaadiSat2:
      • It is a Cubesat weighing around 8 kg and carries 75 different payloads.
      • Girl students from rural regions across the country were provided guidance to build these payloads.
      • The payloads are integrated by the student team of “Space Kidz India”.
    • EOS-07:
      • EOS-07 is a 156.3 kg satellite designed and developed by ISRO.
      • Its mission objective is to design and develop payload instruments compatible with microsatellite buses and new technologies for future operational satellites.

What is a Small Satellite Launch Vehicle?

  • About:
    • SSLV is a 3 stage Launch Vehicle configured with three Solid Propulsion Stages and Liquid propulsion-based Velocity Trimming Module (VTM) as a terminal.
    • It is 2 m in diameter and 34m in length with a lift off weight of 120 tonnes and is capable of launching a 10 to 500 kg satellite in 500 km planar orbit.
    • The rocket can be assembled by a small team in only a few days, compared to the 6 months and around 600 people it takes for ISRO’s workhorse PSLV.
  • Objective:
    • It has been developed to capture the emerging small (nano-micro-mini) satellite commercial market, with launches offered on demand.
  • Significance:
    • It provides low-cost access to Space, offers low turn-around time, facilitates flexibility in accommodating multiple satellites and demands minimal launch infrastructure.

Source: IE

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