EOS-09 or Earth Observation Satellite-09 (formerly known as RISAT-1B) was an

Indian Space Research Organisation The Indian Space Research Organisation (ISRO ) is India's national List of government space agencies, space agency, headquartered in Bengaluru, Karnataka. It serves as the principal research and development arm of the Department of Space (DoS), ...

radar imaging Radar is a system that uses radio waves to determine the distance (''ranging''), direction (geometry), direction (azimuth and elevation angles), and radial velocity of objects relative to the site. It is a radiodetermination method used to det ...

satellite designed to provide continuous and reliable remote sensing data for operational applications across various sectors. It was intended to be a follow on to

RISAT-1 Radar Imaging Satellite 1 or RISAT-1, was an Indian remote sensing satellite built and operated by the Indian Space Research Organisation (ISRO). The second RISAT satellite to be launched, it used a C-band 5.35 GHz synthetic-aperture radar ( ...

satellite with similar configuration. The satellite was developed by the ISRO and was the seventh in the series of

RISAT RISAT (Radar Imaging Satellite) is a series of Indian radar imaging reconnaissance satellites built by the ISRO, Indian Space Research Organization (ISRO). They provide all-weather surveillance using synthetic aperture radars (SAR). The ''RIS ...

satellites.

Satellite description

Synthetic Aperture Radar (SAR) can be used for

Earth observation Earth observation (EO) is the gathering of information about the physical, chemical, and biosphere, biological systems of the planet Earth. It can be performed via remote sensing, remote-sensing technologies (Earth observation satellites) or throu ...

irrespective of the light and weather conditions of the area being imaged. It complements/supplements data from Resourcesat,

Cartosat The Cartosat is a series of Indian optical Earth observation satellites built and operated by the Indian Space Research Organisation (ISRO). The Cartosat series is a part of the Indian Remote Sensing Program. They are used for Earth's resource ...

and RISAT-2B Series. The satellite carries a

C-band C band may refer to: * C band (IEEE), a radio frequency band from 4 to 8 GHz * C band (infrared), an infrared band from 1530 to 1565 nm (roughly 200 THz) * C band (NATO) The NATO C-band is the obsolete designation given to the radio frequen ...

synthetic-aperture radar (SAR) and has a liftoff mass of . The EOS-09 orbit is expected to be in a polar and

Sun-synchronous orbit A Sun-synchronous orbit (SSO), also called a heliosynchronous orbit, is a nearly polar orbit around a planet, in which the satellite passes over any given point of the planet's surface at the same local mean solar time. More technically, it is ...

(SSO) at 05:30 AM LTDN, at approximate altitude of 529 km.

Launch Failure

The PSLV-C61 mission launched EOS-9 on 18 May 2025 at 5:59 AM IST. The first and second stages performed nominally, however, the third stage experienced an anomaly which resulted in loss of mission. ISRO is investigating the failure.

References

Earth observation satellites of India Space synthetic aperture radar Spacecraft launched by India in 2025 RISAT {{India-spacecraft-stub

Satellite description

Launch Failure

See also

References