EOS-05
 GISAT-1A in the clean room before encapsulation | |
| Names | EOS-05 / GISAT-1A |
|---|---|
| Mission type | Earth observation |
| Operator | ISRO |
| COSPAR ID | 2026-202A |
| SATCAT no. | 100607 |
| Website | https://www.isro.gov.in/Mission_GSLVF17.html |
| Spacecraft properties | |
| Spacecraft | GISAT |
| Bus | I-2K |
| Manufacturer | ISRO |
| Launch mass | 2,367 kg (5,218 lb) |
| Start of mission | |
| Launch date | 3 September 2026, 21:25 UTC |
| Rocket | GSLV Mk II (F17) |
| Launch site | Satish Dhawan Space Centre, SLP |
| Contractor | ISRO |
| Orbital parameters | |
| Reference system | Geocentric orbit |
| Regime | Geosynchronous orbit |
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.[1] The satellite aims to improve the existing remote sensing capabilities.[2][3][4]
Objectives
[edit]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 42 metres (138 ft) spatial resolution.[5]
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.[6]
Instruments
[edit]- 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
| Band | Channels | Ground Resolution(m) | Range(μm) |
|---|---|---|---|
| Multispectral (VNIR) | 6 | 42 | 0.45 – 0.875 |
| Hyperspectral (VNIR) | 158 | 318 | 0.375 – 1.0 |
| Hyperspectral (SWIR) | 256 | 191 | 0.9 – 2.5 |
Launch
[edit]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.[7][8]
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.[9][10]
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.[11][12]
References
[edit]- ↑ Mukunth, Vasudevan (19 August 2026). "All eyes on GISAT-1A mission as ISRO aims to mend faulty launch streak". The Hindu. ISSN 0971-751X. Retrieved 3 September 2026.
- ↑ "GISAT-1, 2 (EOS-03, 05)". Gunter's Space Page. Retrieved 2 February 2026.
- ↑ "CEOS EO Handbook – AGENCY SUMMARY - ISRO". CEOS. October 2022. Retrieved 1 December 2022.
- ↑ "WMO OSCAR | Satellite: GISAT". space.oscar.wmo.int. Retrieved 26 November 2025.
- ↑ "GSLV-F17/EOS-05 MISSION". www.isro.gov.in. Retrieved 30 August 2026.
- ↑ "The GISAT-1A Mission". INSIGHTS IAS - Simplifying UPSC IAS Exam Preparation. 20 August 2026. Retrieved 3 September 2026.
- ↑ C.S, Hemanth (4 September 2026). "ISRO successfully launches Earth observation satellite EOS-05". The Hindu. ISSN 0971-751X. Retrieved 6 September 2026.
- ↑ "'Smart boy' GSLV delivers GISAT-1 into orbit, India gets new eyes in space". India Today. 4 September 2026. Retrieved 6 September 2026.
- ↑ "EOS-05 satellite completes orbit manoeuvres en route to GEO". BusinessLine. 6 September 2026. Retrieved 6 September 2026.
- ↑ Singh, Gurpreet (6 September 2026). "171 km to 20,000 km: ISRO EOS-05 completes first orbit raise on journey to 35,786 km orbit". Moneycontrol. Retrieved 6 September 2026.
- ↑ "New 'eye in the sky': Isro's EOS-05 satellite settles into geosynchronous orbit". The Indian Express. 8 September 2026. Retrieved 8 September 2026.
- ↑ "ISRO's EOS-05 Mission: Final Orbit-Raising Manoeuvre Successful, Satellite Now In Geostationary Orbit". ETV Bharat News. 8 September 2026. Retrieved 8 September 2026.
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