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ISRO launches new rocket SSLV-D2

Published: 16th Feb, 2023


The Indian Space Research Organisation (ISRO) launched the second edition of the Small Satellite Launch Vehicle (SSLV-D2) from the first launch pad of Satish Dhawan space centre at Sriharikota, Andhra Pradesh.


Key-highlights of the launch

  • It placed the Indian Space Research Organisation (ISRO) earth observation satellite EOS-07 and two co-passenger satellites — Janus-1 and AzaadiSat2 — developed by start-ups, in a 450-km circular orbit around the Earth.
  • The objectives of the SSLV-D2 mission are the demonstration of a designed payload capacity of SSLV in low-Earth orbit, and the injection of an Earth Observation Satellite and two passenger satellites into a 450.7-kilometre circular orbit.


  • EOS-07 is 156.3 kg satellite designed, developed and realized by ISRO.
  • EOS-07’s primary mission objective would be to gather data for Geographic Information Systems (GIS) applications, such as cartography, regulation of use of coastal land, urban and rural management, and many more.


  • Janus-1 is a technology demonstrator satellite built by United States-based Antaris and its Indian partners XDLinks and Ananth Technologies.
  • It is a standardised satellite bus on which multiple payloads can be attached just like lego blocks. This will enable companies to quickly and cheaply launch their payloads. 
  • A satellite bus is the main structure of a satellite on which the payloads — which can be used for multiple applications such as earth observation, signal monitoring, or ship tracking — rest. 


  • The payloads have been built by 750 girl students from across India. A similar satellite by SpaceKidzIndia was launched aboard SSLV-D1 in August last year. 
    • The payloads remain the same — LoRa amateur radio, a sensor to measure radiation levels in space, and sensors to measure the health of the satellite such as temperature, reset count, and inertial data — but this second satellite has an additional feature.
  • SpaceKidzIndia — which aims to promote space awareness among children — has made the satellite expandable: the 8-unit satellite will have a spring mechanism-based external frame, which will open up once the satellite is in orbit. 
    • After the frame opens up, the satellite will become four times its size.


About SSLV

  • SSLV is a three-stage launch vehicle configured with three solid propulsion stages and a terminal stage.
    • A solid propulsion rocket stage uses solid propellants as the fuel.
    • The terminal stage is a liquid propulsion-based Velocity Trimming Module (VTM). 
  • The key features of SSLV are
    • low cost, flexibility in accommodating multiple satellites
    • 'launch on demand' feasibility
    • low turnaround time (the time taken to complete a process)
    • minimal launch infrastructure requirements
    • increased production rate from industries
  • Also, SSLV has the minimum launch pad occupancy, which means that integration of the vehicle and subsequent launch can be completed within 24 hours. 
  • SSLV has multiple satellite mounting options for nanosatellites, micro satellites, and mini satellites. The launch vehicle can carry a single satellite weighing up to 500 kilograms to a 500-kilometre planar orbit. 

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