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Mission type Navigation
Operator ISRO
COSPAR ID 2017-051A
SATCAT no. 42928Edit this on Wikidata
Mission duration 10 years
Spacecraft properties
Manufacturer ISRO Satellite Centre
Space Applications Centre
Launch mass 1,425 kilograms (3,142 lb)
Dry mass 0 kilograms (0 lb)
Start of mission
Launch date 31 August 2017, 18:59 UTC
Rocket PSLV-XL C39
Launch site Satish Dhawan SLP
Contractor ISRO
End of mission
Disposal spacecraft shielding failure[1]
Orbital parameters
Reference system Geocentric
Regime Geosynchronous

IRNSS-1H was the eighth in the Indian Regional Navigational Satellite System (IRNSS) series of satellites, after IRNSS-1A, IRNSS-1B, IRNSS-1C, IRNSS-1D, IRNSS-1E, IRNSS-1F and IRNSS-1G. The satellite was intended to replace the failed IRNSS-1A, and complete the constellation of geosynchronous navigation satellites.


It was lost in the launch failure of PSLV-C39 on August 31, 2017.[2][3] IRNSS-1H was India's first satellite actively built by private firms.[4] The Rs 1420-crore independent regional navigation satellite system is developed by India and is similar to Global Positioning System (GPS) of the US, which has 31 satellites currently in orbit.

The satellite got separated internally, but the heat shield did not open as expected, causing the satellite to be stuck inside the upper stage of the rocket.[5] The reasons are still being analysed.[6] [7] IRNSS-1H failure is only the first one involving a PSLV in 24 years. The last failure happened in 1993, following which many versions of PSLV rockets have had 39 successful launches.[8]

See also[edit]


  1. ^ "IRNSS-1H launch from Sriharikota unsuccessful: ISRO". The Indian Express. 31 August 2017. Retrieved 31 August 2017.
  2. ^ "ISRO to launch a new navigation satellite on August 31". The Indian Express. 24 August 2017.
  3. ^ "PSLV-C39/IRNSS-1H Mission - ISRO". ISRO.
  4. ^ "1 tonne of extra weight doomed PSLV mission".
  5. ^ "heat shield". hindustan times. Retrieved 1 September 2017.
  6. ^ "why it failed". indian express. Retrieved 1 September 2017.
  7. ^ "India's first satellite actively built by private firms to take off".
  8. ^ "ISRO's IRNSS-1H fiasco: Failures are common in space missions, but India can't afford them at this juncture".

External links[edit]