EOS-05: India's First Dedicated Geosynchronous Earth Observation Satellite

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Key takeaways

ISRO successfully launched EOS-05, India's first dedicated imaging satellite in geosynchronous orbit, using the GSLV-F17 rocket.
Weighing 2,367 kg, EOS-05 is the heaviest satellite payload ever delivered into orbit by a standard GSLV launch vehicle configuration.
Positioned at an altitude of 35,786 km, the satellite provides continuous, real-time tracking of rapid natural disasters like cyclones and forest fires.
Unlike the 15,500 active satellites in Low Earth Orbit, EOS-05 operates from Geostationary Orbit to deliver round-the-clock coverage over India without gaps.

The Indian Space Research Organisation (ISRO) successfully launched the Earth Observation Satellite-05 (EOS-05) using the GSLV-F17 rocket from Sriharikota.
This launch marks a critical achievement because EOS-05 is India's first dedicated imaging satellite stationed in a geosynchronous orbit.

Nicknamed the Eye in the Sky, EOS-05 is an advanced satellite equipped with optical and infrared sensors for real-time land and ocean imaging.
The satellite weighs 2,367 kg, making it the heaviest payload ever launched by a standard GSLV rocket configuration.
The mission was executed by GSLV-F17, which marks the 19th operational flight of India's Geosynchronous Satellite Launch Vehicle.
The GSLV is a three-stage launch vehicle featuring a solid engine with four liquid boosters, a liquid second stage, and a cryogenic upper stage (CUS).
Unlike standard Earth observation satellites that circle close in Low Earth Orbit (LEO), EOS-05 operates from Geosynchronous Orbit (GEO) at nearly 36,000 km altitude.
The GSLV-F17 rocket injected the satellite into a Sub-Geosynchronous Transfer Orbit (Sub-GTO).
The satellite will fire its onboard liquid apogee motor (LAM) several times to position itself over the Indian subcontinent.
Satellites in LEO pass over a specific location for only a few minutes, leaving wide time gaps between image updates.
Placing EOS-05 in GEO provides continuous persistence, allowing hourly tracking of rapidly evolving disasters like cyclones, cloudbursts, flash floods, and forest fires.

According to the European Space Agency (ESA), an orbit is the curved path an object takes around another body due to gravity.
Low Earth Orbit (LEO) operates between 160 km and 2,000 km altitude, with satellites completing one orbit every 90 to 120 minutes.
Because LEO sits close to Earth, it offers low signal delay, making it ideal for the International Space Station (ISS) and high-resolution imaging.
Subsets of LEO include Sun-Synchronous Orbits (SSO) for consistent lighting and Very Low Earth Orbit (VLEO) for ultra-sharp pictures.
By late 2026, more than 15,500 active satellites operated in LEO, with 22 operational satellites belonging to India.
Medium Earth Orbit (MEO) ranges from 2,000 km to 35,786 km in altitude, positioned right below the geosynchronous belt.
MEO balances low signal delay with broad geographic coverage on the ground.
Most navigation constellations operate in MEO, including the US GPS network and the European Union's Galileo constellation with 30 satellites.
Geosynchronous Orbit (GSO) lies at 35,786 km altitude, matching Earth's rotation period of 23 hours, 56 minutes, and 4 seconds.
When a geosynchronous orbit sits directly over the equator with zero-degree tilt, it is called a Geostationary Orbit (GEO).
To a person standing on the ground, a GEO satellite appears completely fixed at one spot in the sky.
A single GEO satellite sees nearly one-third of the planet, meaning three evenly spaced satellites can cover almost the entire Earth.

EOS-05 enables continuous monitoring for disaster response, border watch, forest fire detection, and crop monitoring from space.
A geosynchronous satellite matches Earth's rotation period, while a geostationary satellite is a special zero-inclination version that stays fixed over the equator.
Key applications of EOS-05 include monitoring natural disasters, tracking maritime activity, spotting forest fires, and assessing crop health.
The GSLV uses three stages including solid, liquid, and indigenous cryogenic propulsion to lift heavy payloads into high orbits.
Continuous satellite observation provides real-time warnings, helping authorities respond quickly to natural disasters and security threats.