TRISHNA

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.

TRISHNA

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	(2025-09-27UTC19:11:19Z) UTC
Start of mission
Launch date	2026 [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

History

The Mission was announced during bilateral talks between India and France in July 2023.^[5][6] 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 2026, aboard a PSLV rocket from Satish Dhawan Space Centre.^[7][2] This marks the next collaboration in space between India and France following the Megha-Tropiques and SARAL satellites.

A Workshop is planned to be conducted by ISRO and CNES in November 2024 about the mission goals.^[2]It's 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.^[8]

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.^[7][9]