EOS-04

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 the sixth in a series of RISAT satellites.

EOS-04

EOS-04 Satellite
Names	Radar Imaging Satellite-1A
Mission type	Imaging radar
Operator	ISRO
COSPAR ID	2022-013A
SATCAT no.	51656
Website	www.isro.gov.in/launcher/pslv-c52-eos-04-mission
Mission duration	10 years (planned)[1] 3 years, 2 months, 19 days (in progress)
Spacecraft properties
Spacecraft	EOS-04
Manufacturer	Indian Space Research Organisation
Launch mass	1,710 kg (3,770 lb)[1]
Power	2280 watts[1]
Start of mission
Launch date	14 February 2022, 00:29 UTC
Rocket	PSLV-C52
Launch site	Satish Dhawan Space Centre, First Launch Pad (FLP)
Contractor	Indian Space Research Organisation
Orbital parameters
Reference system	Geocentric orbit[2]
Regime	Sun-synchronous orbit
Perigee altitude	526.7 km (327.3 mi)
Apogee altitude	543.4 km (337.7 mi)
Inclination	97.6°
Period	95.2 minutes
Instruments
Synthetic Aperture Radar (C-band) (SAR-C)
Earth observation satellites series ← RISAT-2BR2 (EOS-01) RISAT-1B (EOS-09) →

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 ₹550 crore or US$65 million in 2023).^[9][10]

Launch

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

• Spaceflight portal

• RISAT
• PSLV