ISRO launched GSLV-F17 from Satish Dhawan Space Centre, Sriharikota, at 2:55 am IST, placing EOS-05 into a sub-geosynchronous transfer orbit. EOS-05 is India's first imaging satellite from geosynchronous orbit, operating at roughly 36,000 km altitude. It is also the heaviest satellite placed by GSLV into sub-GTO. The 51.7-metre rocket has a liftoff mass of 420.5 tonnes. This was the 19th flight of the GSLV. The satellite supports visible, infrared, multispectral, and hyperspectral imaging with near-real-time capability.

The GSLV (Geosynchronous Satellite Launch Vehicle) is India's workhorse for placing heavier payloads into geosynchronous transfer orbit (GTO). Unlike the PSLV, which primarily serves polar and sun-synchronous orbits, GSLV uses a cryogenic upper stage — a technology India developed indigenously after being denied access to it in the 1990s. EOS-05 (Earth Observation Satellite-05) marks a qualitative leap: it is the first Indian imaging satellite positioned in geosynchronous orbit, meaning it remains stationary relative to Earth at ~36,000 km. This enables continuous, persistent observation of a fixed region — unlike low-earth-orbit satellites that revisit a location periodically. The imaging bands — visible, infrared, multispectral, and hyperspectral — allow applications ranging from agriculture and forestry monitoring to disaster management and defence surveillance. The sub-GTO insertion orbit is a stepping stone; the satellite's own propulsion raises it to the final geostationary position. The mission also reflects the growing ISRO-industry partnership under India's reformed space sector policy post-2020, where private players contribute to manufacturing and integration. UPSC examiners consistently test the distinction between PSLV and GSLV capabilities, orbit types, and what each Earth observation mission is designed to do — making EOS-05's unique geosynchronous imaging role a high-value fact.