Technology

ISRO succeeds with EOS-05 geostationary satellite

2026-09-08 - ABikram Mondal

ISRO places EOS-05 in geostationary orbit

ISRO launched its first successful mission of 2026 on September 4 when the GSLV-F17 rocket lifted off from Sriharikota at 2:55 am IST. The vehicle carried the 2,367 kg EOS-05 satellite, also known as GISAT-1A, and placed it in a sub-geosynchronous transfer orbit about 18 minutes later. This marks the agency's return to flight after the January PSLV failure and gives India its first dedicated imaging satellite operating from geostationary altitude.

The satellite will hover near 36,000 km, matching Earth's rotation so it stays fixed over one region. Previous Indian earth observation satellites worked from low earth orbit and required frequent passes. EOS-05 changes that for continuous coverage.

Launch vehicle and satellite details

The GSLV-F17 stands 51.7 metres tall. ISRO Chairman V Narayanan said after the flight that the rocket had successfully and precisely injected the advanced Earth observation satellite in the intended orbit. The payload is the heaviest ever carried by a GSLV, according to the agency.

EOS-05 ends a long wait for the Gisat programme. Earlier attempts faced repeated delays and one outright loss. This success delivers the strategic data capability that planners sought years ago.

Comparison with closest Indian launch systems

Parameter	GSLV-F17 (EOS-05)	PSLV-C62 (Jan 2026)	LVM3-M6 (recent commercial)
Payload mass to intended orbit	2,367 kg (sub-GTO)	Lower capacity LEO payload (exact mass not stated for EOS-N1)	6,100 kg to 518 km LEO
Orbit type	Sub-geosynchronous transfer	Polar sun-synchronous LEO	Low Earth Orbit
Vehicle height	51.7 m	Approximately 44 m	43.4 m
Launch date	4 September 2026	12 January 2026	December 2025 (approx)
Outcome	Success, first 2026 mission	Failure in third stage	Success, heaviest LEO payload from India

The numbers come directly from ISRO statements and PTI reports. No resolution or sensor details for EOS-05 appeared in the mission releases, so those figures stay out.

What the numbers leave out

Geostationary imaging changes how India watches weather, disasters and strategic areas. Continuous stare replaces snapshots from passing satellites. The real test begins once the satellite reaches final orbit and its instruments turn on. ISRO has not released exact imaging specifications or revisit times yet.

India now joins a small group with operational geo-based earth observation. The data will support defence, agriculture and disaster response without waiting for orbital passes. Future missions listed for the rest of the financial year include more navigation satellites and the first uncrewed Gaganyaan flight. Sustaining the cadence remains the next hurdle after this single successful return.

Readers who want updates on these programmes can follow official ISRO channels. The September 4 flight shows the GSLV family can handle heavier strategic payloads than earlier versions managed.

The short version. ISRO's September 4 launch of the 2,367 kg EOS-05 gives India its first geostationary imaging satellite after years of setbacks.

Sources

Reported from the sources above on 2026-09-08. Figures are as published at the time of writing. If something here has moved on, the linked source is the one to trust.

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