Wikipedia

List of SSLV launches

The Small Satellite launch vehicle is an expendable small-lift capacity launch vehicle designed and built by ISRO.

SSLV flight D2 during rollout.

Launch statistics

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1
2
3
2022
2023
2024
  •   Failure
  •   Partial failure
  •   Success
  •   Planned
Decade-wise summary of SSLV launches
Decade Successful Partial success Failure Total
2020s 2 0 1 3

List of SSLV launches

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Flight No. Date and

time (UTC)

Rocket,
configuration 		Launch site Payload Payload mass Orbit User Launch

outcome

D1 7 August 2022
03:48 		SSLV First   EOS 02
  AzaadiSAT[1] 		143 kg LEO (intended)

TAO (achieved)

ISRO Failure
The first developmental flight of SSLV. The mission target was a circular orbit of altitude 356.2 km with 37.2° inclination. The mission carried two satellite payloads. The 135 kg EOS 02, an Earth observation satellite and the 8 kg AzaadiSAT CubeSat.[2][3][4]

Due to sensor failure coupled with shortcomings of onboard software, the stage as well as the two satellite payloads were injected into an unstable transatmospheric Earth orbit measuring 356×76 km and subsequently destroyed upon reentry. According to S. Somanath, an anomaly lasting 2 seconds in one of the accelerometers during second stage separation initiated salvage mode by onboard computer. Guidance, navigation, and control software switched from 'closed loop guidance' where it received real-time feedback from all sensors to an 'open loop guidance' where accelerometer data gets isolated and a predetermined path is followed.[5] This resulted in velocity shortfall from the required 7.3 km/s to 7.2 km/s. Being in salvage mode, Velocity-Trimming Module didn't rectify this shortfall which led to mission failure.

D2 10 February 2023
03:48 [6][7][8] 		SSLV First   EOS-07
  Janus-1
  AzaadiSAT-2
  		156.3 kg
11.5 kg
7.3 kg
Total = 334 kg 		LEO ISRO Success
Second developmental flight of the SSLV.[9][10][11] The purpose of SSLV-D2 is to launch EOS-07, Janus-1 and AzaadiSAT-2 into a 450-kilometer circular orbit and showcase the in-flight performance of the SSLV vehicle systems.[12] According to SSLV-D1 fault evaluation study, six onboard accelerometers detected vibrations that were longer in duration and more intense during the second stage of separation. In order to ensure that this problem doesn't occur again, the second stage detachment system in SSLV-D2 was modified to reduce vibrations. Furthermore, the system was redesigned to navigate utilizing NavIC data and readings will now be monitored for a longer time before entering rescue mode.[13] The separation mechanism, the equipment bay, and the on-board system for identifying malfunctioning sensors were further modified and five new pieces of hardware were installed. The electronics in SSLV-D2 worked successfully, as did the launch vehicle's new, affordable guidance and navigation system.[14]
D3 16 August 2024
03:47 [15][16] 		SSLV First   EOS-08
  SR-0 DEMOSAT 		175.5 kg
0.2 kg
Total = 175.7 kg 		LEO ISRO Success
Third developmental flight and completion of SSLV Development Project.[17][18] The development team will continue to search for specific operational activities in the VTM stage before ISRO supplies the industry with SSLV technology for serial production. Any necessary fine-tuning will be finished prior to the technology transfer.[19][20] Repeatable flight performance of the SSLV vehicle systems has also been demonstrated by SSLV-D3.[21]

Future launches

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Date / time (UTC) Rocket,
Configuration 		Launch site Payload Orbit User
NET 2025[22] SSLV SHAR   TBD
  PARIKSHIT 		ISRO
Flight S1. First serial flight of the SSLV.[16]
NET 2025[22] SSLV SHAR   TBD
  Azista60° 		ISRO
Flight S2.[16]
2026[23] SSLV SHAR   Optimus LEO Space Machines Company
Space MAITRI (Mission for Australia-India's Technology, Research and Innovation). First dedicated commercial SSLV launch.
TBD[24] SSLV SHAR   BlackSky Global-5, 6, and two others LEO Spaceflight Industries
Manifested on a future SSLV commercial flight, four 56 kg Blacksky Global satellites to ~500 km circular orbit with 50° inclination.[25][26]

References

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  1. ^ "AzaadiSAT – Space Kidz India". Retrieved 2022-07-08.
  2. ^ "SSLV-D1/EOS-2 Mission Brochure" (PDF). Archived from the original (PDF) on 3 August 2022. Retrieved 4 August 2022.
  3. ^ Madhumathi, D.S. (2019-08-07). "ISRO's mini launcher SSLV is unborn but has 2 flights booked". The Hindu. ISSN 0971-751X. Retrieved 2019-08-16.
  4. ^ "Department of Space, Annual Report 2020-2021" (PDF). ISRO. p. 23. Archived (PDF) from the original on 4 March 2021. Retrieved 6 March 2021. EOS-02: EOS-02 is configured around MicroSat-TD bus platform to demonstrate launch on demand capability with SSLV. It is expected to meet the ever-increasing user demands for cartographic applications, urban and rural management, coastal land use and regulation, utilities mapping, development and various other GIS application. The mission life of the satellite is 9 months.
  5. ^ Subramanian, T. s (2022-08-11). "ISRO chief S. Somanath interview | 'An anomaly for two seconds led to SSLV mission's underperformance'". The Hindu. ISSN 0971-751X. Retrieved 2022-08-11.
  6. ^ Kumar, Chethan (26 January 2023). "SSLV 2nd mission to carry US Sat, EOS-7; OneWeb Sats set to arrive Friday". Times of India. Retrieved 27 January 2023.
  7. ^ "ISRO planning to launch second development SSLV flight in Feb: S Somanath". mint. 2023-01-04. Retrieved 2023-01-04.
  8. ^ "Sslv Hardware Ready, Launch Likely In '23 | Bengaluru News - Times of India". The Times of India. Dec 5, 2022. Retrieved 2022-12-05.
  9. ^ Rajwi, Tiki (12 October 2022). "Second development flight of Small Satellite Launch Vehicle likely this year". The Hindu. ISSN 0971-751X. Retrieved 13 October 2022.
  10. ^ "SSLV-D2/EOS-07 MISSION". www.isro.gov.in. Retrieved 2023-02-05.
  11. ^ "SSLV-D2/EOS-07 Mission: Second Developmental Flight of SSLV". www.isro.gov.in. Retrieved 2023-02-05.
  12. ^ "Isro's SSLV-D2/EOS-07 mission successful; three satellites placed in orbits". The Times of India. 2023-02-10. ISSN 0971-8257. Retrieved 2024-08-16.
  13. ^ Singh, Abhinav (10 February 2023). "Mission accomplished: ISRO's SSLV-D2 launch explained". The Week. Retrieved 2024-08-16.
  14. ^ Dutt, Anonna (2023-02-10). "SSLV-D2 places three small satellites in orbit". The Indian Express. Retrieved 2024-08-16.
  15. ^ "Loksabha Q&A" (PDF). DEPARTMENT OF SPACE. 2023-04-05.
  16. ^ a b c "Integrated Launch Manifesto for 2023-24 (Q4) & 2024-25". NSIL. 2024-02-08.
  17. ^ "SSLV-D3/EOS-08 Mission". ISRO. Retrieved 2024-08-16.
  18. ^ "SSLV development complete, says Isro chairman Somanath after today's launch". The Indian Express. 2024-08-16. Retrieved 2024-08-16.
  19. ^ C.S, Hemanth (2024-08-16). "ISRO successfully launches EOS-08 Earth Observation Satellite". The Hindu. ISSN 0971-751X. Retrieved 2024-08-16.
  20. ^ Dutt, Anonna (2024-08-16). "SSLV development complete, says Isro chairman Somanath after today's launch". The Indian Express. Retrieved 2024-08-16.
  21. ^ "Isro's SSLV-D3 mission successful, EOS-08 and SR-0 Demosat satellites placed in orbit". The Times of India. 2024-08-16. ISSN 0971-8257. Retrieved 2024-08-16.
  22. ^ a b "Unstarred Question No. 406: Space Programmes and Missions" (PDF). Lok Sabha. Parliament of India. 24 July 2024. Archived (PDF) from the original on 28 July 2024. Retrieved 28 July 2024. Following are the space programmes & missions planned in the year 2024. [...] One SSLV mission, to launch a technology demonstration Satellite (EOS-08).
  23. ^ "SSLV's first dedicated commercial launch to put Australia-built satellite into orbit in 2026". The Economic Times. 26 June 2024. Retrieved 28 July 2024.
  24. ^ "SSLV | BlackSky Global 5 & 6". Next Spaceflight. Retrieved 2023-09-06.
  25. ^ "Application for Earth Exploration Satellite Service by BlackSky Global, LLC" (PDF). FCC. 25 July 2019. p. 6. Archived from the original (PDF) on 28 July 2019. Retrieved 28 July 2019. Global-5 through Global-8 are currently scheduled to be launched in November 2019 on a Small Satellite Launch Vehicle (SSLV) by the Indian Space Research Organization from its Satish Dhawan Space Center   This article incorporates text from this source, which is in the public domain.
  26. ^ "BlackSky Global to launch four earth observation satellites on board ISRO SSLV-D2". The Tech Outlook. 2021-02-25. Retrieved 2023-09-06.
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