ISRO Launches GSLV-F17/EOS-05: India's First Geo-Imaging Satellite Successfully Placed in Orbit
ISRO successfully launched the GSLV-F17 mission carrying the EOS-05 Earth observation satellite from Sriharikota at 2:55 AM IST on September 4, 2026.
The mission marks an important achievement for India's satellite-launch programme and its Earth-imaging capabilities from geosynchronous orbit.
The launch took place from the Satish Dhawan Space Centre (SDSC-SHAR), Sriharikota, Andhra Pradesh, using the Geosynchronous Satellite Launch Vehicle (GSLV) Mark II.
GSLV-F17 Carries EOS-05
The GSLV-F17 mission carried EOS-05, an Earth observation satellite weighing approximately 2,367 kg.
What makes EOS-05 notable is its planned operation from geosynchronous orbit. Satellites placed in this type of orbit can observe a large region repeatedly, making them useful for applications where frequent monitoring is important.
EOS-05 is designed to strengthen India's capabilities in Earth imaging and monitoring.
Why EOS-05 Is Important
A satellite operating from geosynchronous orbit can provide repeated observations of a broad area. This can be particularly useful for monitoring changes that need to be tracked regularly rather than through occasional satellite passes.
Potential applications of such observations include:
- Weather and atmospheric monitoring
- Natural-disaster assessment
- Agriculture and crop monitoring
- Forest and environmental observation
- Earth-resource studies
- Monitoring of large geographic regions
The satellite's high-altitude observational capability can therefore complement India's existing fleet of Earth-observation satellites.
What is Special About the GSLV-F17 Mission?
The mission is also significant for the GSLV Mark II, India's indigenous launch vehicle designed to place heavier payloads into geosynchronous transfer and related orbits.
The latest flight follows the unsuccessful GSLV-F10/EOS-03 mission in August 2021, when an anomaly in the cryogenic upper stage prevented the EOS-03 satellite from reaching orbit.
The successful GSLV-F17 mission is therefore an important operational achievement for the launcher.
GSLV-F17 Mission: Key Facts
| Feature | Details |
|---|---|
| Mission | GSLV-F17 / EOS-05 |
| Launch Date | September 4, 2026 |
| Launch Time | 2:55 AM IST |
| Launch Vehicle | GSLV Mark II |
| Satellite | EOS-05 |
| Satellite Type | Earth Observation Satellite |
| Approx. Mass | 2,367 kg |
| Launch Centre | Satish Dhawan Space Centre, Sriharikota |
| Orbit | Geosynchronous / Sub-GTO mission profile |
| Launch Agency | ISRO |
107th Launch from Sriharikota | Launch History Milestone
The GSLV-F17/EOS-05 mission is also notable in India's launch history. It is being reported as the 107th launch from Sriharikota, while representing the 19th flight of the GSLV.
These figures are different from a simple mission-number count, so they should not be presented interchangeably.
What is a Geosynchronous Orbit?
A geosynchronous orbit has an orbital period equal to Earth's rotation period. At an altitude of about 35,786 km above the equator, a satellite can have an orbital period of approximately one sidereal day.
A satellite in a suitable geosynchronous orbit can therefore remain synchronized with Earth's rotation. If its orbit is also circular and directly over the equator, it can appear almost stationary over one region of Earth; this specific case is called a geostationary orbit.
Geosynchronous vs. Geostationary Orbit
A geosynchronous orbit matches Earth's rotation period (~24 hours) at an altitude of approximately 35,786 km.
While a geosynchronous orbit synchronized with Earth allows repeated regional passes, a geostationary orbit is a specific circular, equatorial subset of geosynchronous orbits where the satellite appears stationary over a fixed point on Earth.
This distinction is important because geosynchronous and geostationary are not exactly the same thing.
GSLV-F17 vs GSLV-F10: Why the Latest Flight Matters
The comparison with GSLV-F10 is useful for understanding the significance of the latest mission.
In August 2021, GSLV-F10 was launched with EOS-03. The mission did not achieve its intended objective because of an anomaly during the cryogenic upper-stage operation.
GSLV-F17, carrying EOS-05, represents a successful return to this class of mission with the GSLV.
Rather than simply describing the flight as a "recovery" from the earlier failure, it is more accurate to view it as another successful demonstration of India's GSLV capability after the 2021 setback.
ISRO's Growing Earth-Observation Capability
India operates satellites for a wide range of Earth-observation applications. Missions such as EOS-05 add another layer to this capability by targeting observations from a much higher orbit.
The ability to repeatedly observe large areas can be particularly valuable when scientists, government agencies and disaster-management authorities need information about rapidly changing conditions.
The GSLV-F17/EOS-05 mission therefore has significance beyond the launch itself: it adds to India's long-term effort to develop and operate increasingly capable indigenous space systems.
GSLV-F17/EOS-05: What Happens Next?
After launch and orbital injection, the satellite undergoes the necessary orbital and operational procedures before beginning its planned observation activities.
The spacecraft must be checked, commissioned and brought into its operational configuration before regular imaging and data-generation activities begin.
This distinction is important in reporting: successful launch and orbital injection do not necessarily mean that the satellite has immediately begun full operational imaging.
Conclusion
The successful GSLV-F17/EOS-05 launch on September 4, 2026, adds another important mission to India's Earth-observation programme.
EOS-05's planned operation from geosynchronous orbit gives it the ability to repeatedly observe a large region, while the successful flight provides another important operational achievement for India's GSLV Mark II.
For India, the mission is significant both for the satellite it carried and for the continuing development of indigenous launch capability.
GSLV-F17/EOS-05: Important Facts for UPSC, SSC and Competitive Exams
A short revision table can follow:
| Topic | Important Fact |
|---|---|
| Mission | GSLV-F17/EOS-05 |
| Launch Date | September 4, 2026 |
| Launch Vehicle | GSLV Mark II |
| Satellite | EOS-05 |
| Launch Site | Satish Dhawan Space Centre, Sriharikota |
| Launch Time | 2:55 AM IST |
| Satellite Type | Earth Observation Satellite |
| Target Orbit | Geosynchronous Orbit |
GSLV-F17/EOS-05 GK Questions and MCQs
Q1. Which satellite was launched aboard the GSLV-F17 mission?
A. EOS-03
B. EOS-05
C. Cartosat-4
D. RISAT-2
Answer: B. EOS-05
Q2. From where was the GSLV-F17/EOS-05 mission launched?
A. Thumba Equatorial Rocket Launching Station
B. Mahendragiri
C. Satish Dhawan Space Centre, Sriharikota
D. Vikram Sarabhai Space Centre
Answer: C. Satish Dhawan Space Centre, Sriharikota
Q3. Which launch vehicle was used for the EOS-05 mission?
A. PSLV
B. SSLV
C. GSLV Mark II
D. LVM3
Answer: C. GSLV Mark II
Q4. What type of satellite is EOS-05?
A. Navigation satellite
B. Earth observation satellite
C. Communication satellite
D. Astronomy satellite
Answer: B. Earth observation satellite
Q5. When was the GSLV-F17/EOS-05 mission launched?
A. September 2, 2026
B. September 3, 2026
C. September 4, 2026
D. September 5, 2026
Answer: C. September 4, 2026
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Official Source / Refrences:
ISRO mission and launch information should be treated as the primary reference for the mission's launch time, vehicle, satellite and orbital details.
All Images Sources - ISRO
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