India’s "Third Eye" in Space (or "Eye in the Sky")

 The ISRO satellite widely referred to as India’s "Third Eye" in Space (or "Eye in the Sky") is EOS-05 (formerly designated under the GISAT-1 series).

Launched aboard the GSLV Mk II-F17 rocket from Sriharikota, EOS-05 marks a massive technological leap forward as India’s first dedicated state-of-the-art geo-imaging Earth observation satellite placed directly in a geosynchronous orbit.

GSLV carrying EOS-05 satellite. Source: Vajiram & Ravi

What Makes EOS-05 India's "Third Eye"?

Unlike traditional low-Earth orbit (LEO) satellites that pass over a given geographic region only once or twice a day, EOS-05 is parked in a geosynchronous orbit (~36,000 km altitude). Because it orbits at the same rotational speed as Earth, it remains virtually stationary over the Indian subcontinent and South Asia. This grants India uninterrupted, near real-time surveillance across its entire landmass and surrounding maritime regions.

Key Specifications & Launch Profile

Feature	Details
Satellite Weight	2,367 kg (Heaviest payload carried by GSLV Mk II)
Launch Vehicle	GSLV-F17 (19th flight of GSLV)
Launch Site	Satish Dhawan Space Centre (SDSC), Sriharikota
Orbital Altitude	~36,000 km (Geosynchronous Transfer Orbit transition)
Mission Life	7 to 9+ Years
Imaging Frequency	Multi-spectral images every 5 minutes; full Indian landmass every 30 minutes

Key Capabilities & Primary Uses

1. Real-Time Border & Strategic Surveillance EOS-05 serves as a continuous strategic observer for national defense. Its ability to capture high-resolution multi-spectral imagery allows continuous tracking of activity along volatile land borders (including northern and western borders) and maritime boundaries across the Indian Ocean.

2. Rapid-Response Disaster Management During sudden natural calamities—such as cloudbursts, severe floods, landslides, forest fires, or cyclones—EOS-05 sends rapid multi-band imagery every 5 minutes. This real-time feed empowers disaster response teams (like NDRF) to coordinate evacuation and relief efforts with unprecedented speed.

3. Environmental & Agricultural Tracking Equipped with hyperspectral and multispectral sensors, EOS-05 allows scientists and agricultural bodies to perform real-time monitoring of crop health, soil moisture levels, water body depletion, and deforestation patterns across seasons.

4. Weather & Meteorological Forecasting Operating in high orbit alongside Indian meteorological satellites, it helps meteorologists detect rapidly forming atmospheric turbulences, storm tracks, and oceanic sea-surface conditions long before they strike coastal areas.

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