EOS-05 (also known as GISAT-1A) is an Indian Earth observation satellite. It is the second satellite in the GISAT series produced by ISRO. The satellite aims to improve the existing remote sensing capabilities.
Objectives GISATs image in multi-spectral and hyper-spectral bands to provide near real-time pictures of large areas of India, under cloud-free conditions, at frequent intervals which is, selected field image in every 5 minutes and entire Indian landmass image every 30 minutes at spatial resolution.
These near real-time observations serve for monitoring of natural disasters like cyclones, floods, cloudbursts, and forest fires, as well as for agricultural assessment and security surveillance.
Instruments 700 mm Ritchey–Chrétien telescope based on the design of Cartosat-2A Array detectors in Visible and Near-InfraRed (VNIR), and Short Wave-InfraRed (SWIR) bands
+Imaging capabilities of GISAT-1A BandChannelsGround Resolution(m)Range(μm)Multispectral (VNIR)6420.45 – 0.875Hyperspectral (VNIR)1583180.375 – 1.0Hyperspectral (SWIR)2561910.9 – 2.5
Launch GISAT-1A was launched from Launchpad 2 of the Satish Dhawan Space Centre aboard the GSLV-F17 mission at 2:55 am IST on 4 September 2026. The satellite was placed at the intended Sub-Geosynchronous Transfer Orbit (Sub-GTO) about 18 minutes after lift-off. At 2,637 kg, the satellite is the heaviest satellite launched by GSLV.
On 5 and 6 September, the satellite fired its Liquid Apogee Motor (LAM) engine twice for 5,406.4 seconds (about 90 minutes) until 8:19 pm IST and 5 minutes to reach orbits at 20,000 km × 31,129 km and 35,786 km, respectively. The satellite was originally present at an altitude of 171 km.
On 7 September, the third and final orbit raising manoeuvre to reach its intended geosynchronous orbit with altitudes ranging between 34,903 km × 35,884 km. The LAM engine fired for 1247 seconds until 8:47 pm IST. The health and systems of the satellite will be monitored for the next few days after which the imaging systems will be activated.
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