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{{Short description|Planned joint Indo-French weather satellite }}
{{Use dmy dates|date=April 2026}}
{{Use Indian English|date=March 2024}}
{{Infobox spaceflight
| name = TRISHNA
| image = TRISHNA_Earth_Observation_satellite_in_deployed_configuration.png
| mission_type = Weather
| operator = [[ISRO]]/[[CNES]]
| website = https://www.isro.gov.in/TRISHNA_Mission.html
| mission_duration = ~ 5 years with possible 2 year extension <ref>{{Cite web| title=International Science Workshop on High-Resolution Thermal Earth Observation | url=https://www.isro.gov.in/media_isro/pdf/Highlights/Flyer_Trishna_Workshop300724.pdf | archive-url=https://web.archive.org/web/20240730181156/https://www.isro.gov.in/media_isro/pdf/Highlights/Flyer_Trishna_Workshop300724.pdf | archive-date=2024-07-30}}</ref>
| spacecraft_bus = [[Indian Mini Satellite bus|IMS-1K]]
| manufacturer = ISRO
| start_date = {{start date text| |timezone=yes}} UTC
| launch_date = 2026 <ref name=":3">{{Cite web| title=International Science Workshop on High-Resolution Thermal Earth Observation | url=https://www.isro.gov.in/media_isro/pdf/Highlights/Flyer_Trishna_Workshop290724.pdf | archive-url=https://web.archive.org/web/20240729170406/https://www.isro.gov.in/media_isro/pdf/Highlights/Flyer_Trishna_Workshop290724.pdf | archive-date=2024-07-29}}</ref>
| launch_rocket = [[Polar Satellite Launch Vehicle]]
| launch_site = [[Satish Dhawan Space Centre]]
| orbit_regime = Polar sun-synchronous
| orbit_eccentricity = 0
| orbit_altitude = 761 km
| orbit_inclination = ~90°
| orbit_repeat = 8 days
}}

'''TRISHNA''' ''or'' '''(''Thermal infraRed Imaging Satellite for High-resolution Natural resource Assessment'')'''<ref name=":1" /><ref name=":0" /> 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.<ref>{{Cite web |title=TRISHNA Mission: Advancing High-Resolution Thermal Imaging for Climate and Resource Management |url=https://www.isro.gov.in/TRISHNA_Mission.html |access-date=2025-09-22 |website=www.isro.gov.in}}</ref>

== History ==
The Mission was announced during bilateral talks between India and France in July 2023.<ref>{{Cite news |title=India, France agree on setting up strategic dialogue on space issues, work on Trishna satellite |url=https://timesofindia.indiatimes.com/india/india-france-agree-on-setting-up-strategic-dialogue-on-space-issues-work-on-trishna-satellite/articleshow/101771062.cms |access-date=2024-03-23 |work=The Times of India |issn=0971-8257}}</ref><ref>{{Cite web |last=Team |first=ANI |date=July 14, 2013 |title=PM Modi calls to enhance India-France cooperation in Space-based Maritime Domain |url=https://www.aninews.in/news/world/europe/pm-modi-calls-to-enhance-india-france-cooperation-in-space-based-maritime-domain20230714230355/ |access-date=23 March 2024 |website=ANI news}}</ref> On 19 March 2024, TRISHNA received approval from both space agencies and a project team has been formed to finish developing the mission concept.<ref name=":0">{{Cite web |date=2024-03-19 |title=NASA-ISRO SAR (NISAR) Unlikely To Launch Before The End Of May, TRISHNA Gets Space Commission's Nod: Report |url=https://www.timesnownews.com/technology-science/nasa-isro-sar-nisar-unlikely-to-launch-before-the-end-of-may-trishna-gets-space-commissions-nod-report-article-108623408 |access-date=2024-03-23 |website=TimesNow |language=en}}</ref><ref name=":1">{{Cite news |date=2024-03-19 |title=Nisar only in 2nd half of 2024; Trishna gets nod |url=https://timesofindia.indiatimes.com/india/nisar-only-in-2nd-half-of-2024-trishna-gets-nod/articleshow/108620945.cms |access-date=2024-03-23 |work=The Times of India |issn=0971-8257}}</ref> It is currently planned for a launch in 2026, aboard a PSLV rocket from Satish Dhawan Space Centre.<ref name=":2">{{Cite web |title=TRISHNA (Thermal infraRed Imaging Satellite for High-resolution Natural resource Assessment) - eoPortal |url=https://www.eoportal.org/satellite-missions/trishna |access-date=2024-03-23 |website=www.eoportal.org |language=en}}</ref><ref name=":3" /> 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.<ref name=":3" />By 2026, The Preliminary Design Review for the bus elements and the VNIR and SWIR payloads were completed.<ref>[https://www.isro.gov.in/media_isro/pdf/AnnualReport/Annual_Report_2025_26_Eng_29042026_Rev.pdf Annual_Report_2025_26_Eng_29042026_Rev.pdf]</ref>

== Instruments ==
Trishna aims to have a resolution of approximately 57 metres and a re-visit interval of about three days.<ref name=":1" /><ref name=":0" /> 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.<ref name=":2" /><ref>{{Cite web |title=TRISHNA Mission: Advancing High-Resolution Thermal Imaging for Climate and Resource Management |url=https://www.isro.gov.in/TRISHNA_Mission.html |access-date=2025-09-22 |website=www.isro.gov.in}}</ref>

== See Also ==

* [[Megha-Tropiques]]
* [[SARAL]]

==References==
{{Reflist}}

[[Category:Earth observation satellites of India]]
[[Category:Earth observation satellites of France]]
[[Category:Satellite meteorology]]
[[Category:CNES]]
[[Category:ISRO satellites]]
[[Category:2026 in spaceflight]]

TRISHNA - Revision history

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