TRISHNA
Planned joint Indo-French weather satellite
From Wikipedia, the free encyclopedia
TRISHNA or (Thermal infraRed Imaging Satellite for High-resolution Natural resource Assessment)[3][4] is a planned cooperative joint satellite mission between the Indian Space Research Organisation (ISRO) of India and Centre national d'études spatiales (CNES) of France.Its orbit will provide a spatial resolution of 57 meters for land and coastal areas and 1 km for oceanic and polar regions. The mission is designed for a 5-year operational life.[5]
| |
| Mission type | Weather |
|---|---|
| Operator | ISRO/CNES |
| Website | https://www.isro.gov.in/TRISHNA_Mission.html |
| Mission duration | ~ 5 years with possible 2 year extension [1] |
| Spacecraft properties | |
| Bus | IMS-1K |
| Manufacturer | ISRO |
| Expedition | |
| Began | UTC |
| Start of mission | |
| Launch date | October 2027 [2] |
| Rocket | Polar Satellite Launch Vehicle |
| Launch site | Satish Dhawan Space Centre |
| Orbital parameters | |
| Regime | Polar sun-synchronous |
| Eccentricity | 0 |
| Altitude | 761 km |
| Inclination | ~90° |
| Repeat interval | 8 days |
| Instruments | |
| VSWIR (Atmosphere, Land, Snow & Ice) TIR (Land & Ocean) | |
Objectives
The scientific objectives of the mission are:
- ecosystem stress and water use (management of water resources).
- coastal and inland waters (water quality, fish resources, ice).
- urban microclimates monitoring (characterization of urban heat island).
- solid earth (thermal anomaly detection).
- cryosphere (snow and ice monitoring).
- atmosphere (water content, cloud characterization).[6]
History
The Mission was announced during bilateral talks between India and France in July 2023.[7][8] On 19 March 2024, TRISHNA received approval from both space agencies and a project team has been formed to finish developing the mission concept.[4][3] It is currently planned for a launch in October 2027, aboard a PSLV rocket from Satish Dhawan Space Centre.[9] This marks the next collaboration in space between India and France following the Megha-Tropiques and SARAL satellites.By 2026, The Preliminary Design Review for the bus elements and the VNIR and SWIR payloads were completed.[10] Development of the spacecraft was reported to be progressing well as of september 2026.[11]
The mission, named after the Sanskrit word for Thirst, aims to conduct a deep analysis of the global water cycle and climate change. The mission aims to observe t in thermal infrared wavelengths and monitor local surface temperatures, vegetation stress, water availability, evapotranspiration in plants as a part of its mission package.[12]
Instruments
Trishna aims to have a resolution of approximately 57 metres and a re-visit interval of about three days.[3][4] It would have two instruments, namely Visible and Near Infrared (VNIR)/Short Wave InfraRed (SWIR) sensor (VSWIR) that wil be built by ISRO and Thermal InfraRed instrument (TIR) built by CNES.[6][5] CNES will deliver TIR to ISRO in 2026.[13]