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Relevance: GS-III (Science & Technology: Space; Disaster Management) Source: Space & Tech Updates, September 2026

1 · News and Context

Imagine trying to watch a cricket match through a moving train window—you only catch quick glimpses. Older Indian Earth-observation satellites (in Low Earth Orbit) worked like that, passing over India only periodically.
Now, ISRO has successfully launched the EOS-05 satellite. Placed 36,000 km high, it moves at the exact speed of Earth’s rotation. This means it constantly hovers over India, acting like a giant, 24/7 CCTV camera in space.  It allows India to monitor sudden disasters (like flash floods), track secret border movements, and even catch farmers who change their stubble-burning timings to hide from older satellites.

2 · How EOS-05 Changes the Game

Step 1: The Heavy Lift
The heavy 2,367 kg satellite was carried into space by the powerful GSLV-F17 rocket, using India’s own indigenous cryogenic engine.
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Step 2: The Fixed Stare
It parks in a Geosynchronous orbit. Because it matches Earth’s rotation, it stays locked onto the Indian subcontinent permanently.
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Step 3: Real-Time Disaster Tracking
Unlike old satellites that checked back every few hours, EOS-05 can instantly spot sudden glacier breaks or avalanches in the Himalayas.
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Step 4: Smart Farming & Security
Its advanced sensors monitor agricultural health, track exact stubble burning times in Punjab, and provide 24/7 surveillance of India’s hostile borders.

3 · Key Space Concepts

Geosynchronous Orbit
The Fixed Watchman
An orbit 36,000 km high. Satellites here take exactly 24 hours to circle the Earth, making them appear stationary over one specific region.
Low Earth Orbit (LEO)
The Flying Tourist
Older imaging satellites fly much closer to Earth. They capture highly detailed photos but keep moving, meaning they cannot monitor one area constantly.
Cryogenic Stage
The Ultimate Engine
The highly complex upper part of the GSLV rocket. It uses super-cooled liquid fuel to generate the massive thrust needed to push heavy satellites far into space.
Hyperspectral Sensors
Seeing the Invisible
Special cameras on EOS-05 that see beyond normal light. They easily differentiate between healthy crops, dried vegetation, and hidden water bodies.

Prelims Quick Facts: ISRO’s Milestones
Overcoming Failures This successful launch heals the sting of the 2021 GSLV-F10 failure, which sadly resulted in the loss of India’s earlier GISAT-1 mission.
INSAT-3D vs. EOS-05 While India’s older INSAT satellites were strictly for weather forecasting, EOS-05 is our first dedicated, high-resolution Earth-imaging satellite in this high orbit.
Stubble Burning Tactics Farmers often timed their stubble fires to avoid the scheduled passes of LEO satellites. EOS-05’s continuous stare makes this hiding tactic impossible.

MCQ Practice Question
Q. With reference to ISRO’s Earth Observation Satellite EOS-05 (GISAT-1A), consider the following statements:

  1. It is placed in a Low Earth Orbit (LEO) to provide high-resolution, continuous 24/7 surveillance of the Indian subcontinent.
  2. It was successfully launched using the GSLV rocket, which employs an indigenous cryogenic upper stage.
  3. It is equipped with hyperspectral sensors capable of distinguishing between varying types of land cover and vegetation.

Which of the statements given above is/are correct?
(a) 1 and 2 only    (b) 2 and 3 only    (c) 1 and 3 only    (d) 1, 2 and 3

Answer: (b) 2 and 3 only

  • Statement 1 — Incorrect (the trap): EOS-05 is India’s first Earth-imaging satellite placed in a Geosynchronous Orbit (~36,000 km), NOT a Low Earth Orbit. LEO satellites cannot provide continuous 24/7 surveillance over one spot.
  • Statement 2 — Correct: It was lifted by the GSLV-F17 rocket, powered by India’s indigenous cryogenic engine.
  • Statement 3 — Correct: Its advanced hyperspectral sensors are crucial for agriculture and spotting stubble burning.
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