WHY IN NEWS
- On 4 September 2026, ISRO successfully launched GSLV-F17 carrying EOS-05 from the Second Launch Pad at Satish Dhawan Space Centre, Sriharikota.
- EOS-05 is India's first imaging satellite designed to observe Earth from geosynchronous orbit, changing the temporal logic of Indian remote sensing from periodic revisit to persistent regional viewing.
- The mission matters for disaster management, agriculture, weather-linked monitoring, strategic situational awareness and the growth of India's space-industrial ecosystem.
- For UPSC, distinguish geosynchronous orbit from geostationary orbit: every geostationary orbit is geosynchronous, but a geosynchronous satellite need not remain fixed over one longitude unless it is circular and equatorial.
TOP DATA & FACTS FOR UPSC
- The launch took place on 4 September 2026 at 02:55 AM IST.
- GSLV-F17 is the 19th flight of India's Geosynchronous Satellite Launch Vehicle.
- The payload fairing is a 4 m diameter composite ogive configuration.
- EOS-05 was injected into a Sub-Geosynchronous Transfer Orbit before its own orbit-raising manoeuvres.
- The mission used the Second Launch Pad at SDSC-SHAR.
- EOS-05 is classified by ISRO as an Earth Observation spacecraft.
- It is India's first-ever imaging satellite from geosynchronous orbit.
- A geosynchronous orbit has an orbital period approximately equal to Earth's rotation period of about 24 hours.
- A geostationary satellite typically operates near 35,786 km altitude above the equator.
- The mission is listed as ISRO launch mission number 106.
HISTORICAL PERSPECTIVE
- India's civilian Earth-observation programme grew from experimental satellites such as Bhaskara in the late 1970s to the Indian Remote Sensing series, which established operational applications in agriculture, water, forestry and land-use planning.
- Most high-resolution imaging missions use low Earth orbits because proximity improves spatial resolution. Their limitation is revisit time: a satellite sees a location only when its orbital track returns.
- Geostationary meteorological satellites such as INSAT-class systems demonstrated the value of continuous viewing for clouds and cyclones. EOS-05 extends the logic toward dedicated imaging from the geosynchronous regime.
- The GSLV family was developed to place heavier satellites into transfer orbits using an indigenous cryogenic upper stage, an important step toward strategic launch autonomy.
- The mission follows earlier attempts to create persistent geospatial awareness from high orbit and reflects the maturation of Indian sensors, pointing systems and onboard processing.