'Outstanding achievement': PM Modi hails Isro after successful EOS-05 launch
The Indian Space Research Organisation (ISRO) launched the GSLV-F17 rocket carrying the EOS-05 earth observation satellite from the Satish Dhawan Space Centre, Sriharikota.
The satellite, weighing about 2,367 kg, was precisely injected into its intended sub-geosynchronous transfer orbit roughly 18 minutes after liftoff.
Post-injection checks confirmed the satellite's solar panels deployed normally and its health parameters were nominal.
EOS-05 is designed to operate from geosynchronous altitude, allowing continuous observation of the same region of India rather than the periodic revisits typical of low-earth-orbit imaging satellites.
The mission is a technology-and-capability milestone, coming as a successor to an earlier unsuccessful attempt in the same satellite series.
GSLV (Geosynchronous Satellite Launch Vehicle) Programme
GSLV is ISRO's medium-lift launch vehicle designed to place heavier satellites (over 2,000 kg) into geosynchronous transfer orbit, a capability beyond the smaller Polar Satellite Launch Vehicle (PSLV). GSLV uses an indigenously developed cryogenic upper stage (CE-7.5 engine), a technology India developed after being denied cryogenic technology transfer by Russia in the 1990s under US pressure citing the Missile Technology Control Regime (MTCR).
Key Details
- GSLV-F17 was the vehicle's 19th flight and used the Mark II configuration, which carries India's indigenous cryogenic upper stage.
- GSLV is distinct from the more powerful LVM3 (formerly GSLV Mk-III), which is used for heavier payloads such as Chandrayaan missions and Gaganyaan.
- Launches occur from the Second Launch Pad at the Satish Dhawan Space Centre, Sriharikota, Andhra Pradesh.
GSLV-F17's successful flight builds on ISRO's track record with the indigenous cryogenic stage, a technology area historically restricted to India by international suppliers, and reinforces India's self-reliance in heavy-lift launch capability.
Earth Observation Satellite (EOS) Series and Geosynchronous Remote Sensing
The EOS series is ISRO's family of earth observation satellites used for remote sensing applications such as agriculture, forestry, disaster management, and security surveillance. EOS-05 is notable as India's first imaging satellite placed in a geosynchronous (rather than the more common sun-synchronous polar) orbit, enabling near-continuous monitoring of the Indian subcontinent.
Key Details
- EOS-05 carries multispectral and hyperspectral imaging payloads, including visible, near-infrared, and short-wave infrared sensors, for near real-time monitoring.
- From geosynchronous altitude, the satellite can repeatedly image the same geographic patch over India at short intervals, useful for tracking fast-evolving events such as cyclones, floods, and forest fires.
- The mission follows an earlier attempt in the same "GISAT" series, EOS-03, launched on GSLV-F10 in 2021, which did not achieve its intended orbit after a cryogenic-stage anomaly.
EOS-05's successful placement effectively completes the objective that the 2021 GSLV-F10/EOS-03 mission had failed to achieve, adding a geosynchronous earth-observation capability to India's remote sensing constellation, which otherwise mostly comprises polar-orbiting satellites like the Cartosat and Resourcesat series.
Remote Sensing Applications in Governance
Satellite remote sensing data feeds into multiple governance functions, including the National Disaster Management Authority's early-warning and damage-assessment systems, the Ministry of Agriculture's crop-monitoring programmes, and forest-cover assessments by the Forest Survey of India.
Key Details
- Continuous geosynchronous imaging allows near real-time tracking of natural hazards, improving disaster response timelines.
- High-frequency revisit capability supports applications such as crop-health assessment and change detection over agricultural land.
- Data has dual civilian and strategic-surveillance utility, a recurring theme in ISRO's earth observation missions.
EOS-05's stated applications explicitly include disaster monitoring and agricultural assessment, aligning with the broader governance use of India's earth observation satellite fleet.
- EOS-05 satellite mass: approximately 2,367 kg.
- Orbit achieved: sub-geosynchronous transfer orbit, roughly 18 minutes after liftoff.
- Launch vehicle: GSLV-F17 (GSLV Mark II configuration), the 19th flight of the GSLV programme.
- Launch site: Satish Dhawan Space Centre, Sriharikota, Andhra Pradesh (Second Launch Pad).
- Predecessor in series: EOS-03, launched on GSLV-F10 in 2021, did not reach its intended orbit.