India has successfully placed EOS-05 (Gisat-1A), its first advanced Earth-imaging satellite designed to operate from a sub-geosynchronous/geosynchronous orbit. The satellite was launched aboard GSLV-F17 from the Satish Dhawan Space Centre, Sriharikota, after a 27-hour countdown. The rocket carried a payload of 2,367 kg.
Why EOS-05 Is Important
Unlike most Indian Earth-observation satellites that operate in Low Earth Orbit (LEO), EOS-05 operates from a much higher geosynchronous region, around 36,000 km altitude. By moving in sync with Earth’s rotation, it can continuously observe the same broad geographical region.
This persistent coverage can help India monitor:
- Remote border areas and strategic assets
- Severe weather events, including storms and lightning
- Fires and environmental changes
- Agricultural conditions
- Disasters and other rapidly developing events
The satellite is intended for both civilian and military applications, strengthening India’s overall Earth-observation and monitoring capabilities.
GEO Advantage over LEO
| Feature | LEO Earth Observation | EOS-05-type Geosynchronous Observation |
| Altitude | Generally 60–2,000 km | Around 36,000 km |
| Observation | Periodic passes over a location | Continuous view of the same broad region |
| Best suited for | Detailed imagery during satellite passes | Monitoring events as they develop |
| Major advantage | High-resolution observations | Persistent surveillance |
Thus, EOS-05 can function as a persistent “eye in the sky” over the Indian subcontinent, rather than relying only on images captured during periodic orbital passes.
Imaging Capability
EOS-05 carries two multispectral imagers for detailed Earth observation. One camera has a 42-metre spatial resolution, described in the supplied information as the highest-resolution camera ever placed in geostationary orbit.
The combination of multispectral imaging and continuous coverage is expected to improve monitoring of land, agriculture and environmental conditions.
Successor to Failed Gisat-1 Mission
EOS-05 also represents a renewed attempt following the failure of Gisat-1 on 12 August 2021. Gisat-1 was lost when a technical problem in the cryogenic upper stage of the GSLV-F10 prevented proper ignition.
Had that mission succeeded, Gisat-1 would have become India’s first Earth-imaging satellite operating from geostationary orbit. EOS-05 therefore represents both a technological advancement and a renewed effort to achieve this capability.