EOS-04 Satellite
NamesRadar Imaging Satellite-1A
Mission typeImaging radar
COSPAR ID2022-013A Edit this at Wikidata
SATCAT no.51656
Mission duration10 years (planned)[1]
1 year, 6 months (in progress)
Spacecraft properties
ManufacturerIndian Space Research Organisation
Launch mass1,710 kg (3,770 lb)[1]
Power2280 watts[1]
Start of mission
Launch date14 February 2022, 00:29 UTC
Launch siteSatish Dhawan Space Centre, First Launch Pad (FLP)
ContractorIndian Space Research Organisation
Orbital parameters
Reference systemGeocentric orbit[2]
RegimeSun-synchronous orbit
Perigee altitude526.7 km (327.3 mi)
Apogee altitude543.4 km (337.7 mi)
Period95.2 minutes
Synthetic Aperture Radar (C-band) (SAR-C)

EOS-04 or Earth Observation Satellite - 04 (formerly known as RISAT-1A) is an Indian Space Research Organisation Radar Imaging Satellite designed to provide high quality images under all weather conditions for applications such as Agriculture, Forestry & Plantations, Soil Moisture & Hydrology and Flood mapping.[3][4] It is a follow on to RISAT-1 satellite with similar configuration. The satellite is developed by the ISRO and it is sixth in series of RISAT satellites.

Satellite description

Synthetic aperture radar can be used for Earth observation irrespective of the light and weather conditions of the area being imaged.[5] It complements/supplements data from Resourcesat, Cartosat and RISAT-2B Series.[6] The satellite carries a C-band synthetic-aperture radar (SAR) and has a liftoff mass of 1,710 kg (3,770 lb).[2] The EOS-04 orbit is polar and sun-synchronous at 06:00 AM LTDN, at approximate altitude of 529 km.[7]

Assembly Integration and Testing of spacecraft was done by a consortium led by Alpha Design technologies Ltd.[8] Approximate cost of EOS-04 is 490 crore (equivalent to 548 crore or US$69 million in 2023).[9][10]


EOS-04 was launched on the Polar Satellite Launch Vehicle (PSLV-C52) from First Launch Pad(FLP), SDSC, SHAR, Sriharikota at 05:59 hrs IST (00:29 hrs UTC) on 14 February 2022.[6][11][12] It was launched along with two ridesharing satellites, INS-2TD a technology demonstrator by ISRO and INSPIREsat-1 a university satellite.[11]

EOS-04 captured first images on 25 February 2022 after launch.[13]

See also


  1. ^ a b c "PSLV-C52/EOS-04 Mission" (PDF). Archived from the original (PDF) on 9 February 2022. Retrieved 9 February 2022.
  2. ^ a b "PSLV-C52/EOS-04 Mission". ISRO. Archived from the original on 9 February 2022. Retrieved 9 February 2022.
  3. ^ "EOS-04 - ISRO". www.isro.gov.in. Archived from the original on 20 March 2022. Retrieved 17 February 2022.
  4. ^ "CEOS Instrument: Synthetic Aperature Radiometer (RISAT)". Archived from the original on 9 February 2017. Retrieved 9 February 2016.
  5. ^ Raj, N. Gopal (25 April 2012). "RISAT-1's radar can see through clouds and work in darkness". The Hindu. Chennai, India.
  6. ^ a b "PSLV-C52/EOS-04 Brochure - ISRO". www.isro.gov.in. Archived from the original on 9 February 2022. Retrieved 17 February 2022.
  7. ^ Reddy, O.V. Raghav (3 February 2016). "Future Earth Observation Missions of ISRO, NRSC User Interaction Meet 2016" (PDF). Archived from the original (PDF) on 3 February 2017.
  8. ^ Chethan Kumar (15 February 2022). "isro: Consortium led by Adani-backed firm assembled, integrated and tested Isro's earth observation satellite | India News - Times of India". The Times of India. Retrieved 15 February 2022.
  9. ^ "Lok Sabha Unstarred Question No. 4446, Observation Satellite EOS-4" (PDF). 30 March 2022. The total time taken to realize the satellite is 63 months from date of financial sanction and the expenditure towards realization of satellite is nearly Rs. 490 crore.
  10. ^ Kumar, Chethan (1 December 2021). "Teething troubles with indigenous tech cause for delay in 2 Sat launches; humidity halts SSLV - Times of India". The Times of India. Retrieved 15 February 2022.
  11. ^ a b "Successful launch of PSLV-C52 with EOS-04 Satellite - ISRO". www.isro.gov.in. Archived from the original on 17 February 2022. Retrieved 15 February 2022.
  12. ^ "14న పీఎస్‌ఎల్‌వీ ప్రయోగం". EENADU (in Telugu). Retrieved 28 January 2022.
  13. ^ "EOS-04, INS-2TD and INSPIRESat-1: Update - ISRO". www.isro.gov.in. Retrieved 30 March 2022.