EOS-09 or Earth Observation Satellite-09 (formerly known as RISAT-1B) was an Indian Space Research Organisationradar imaging satellite designed to provide continuous and reliable remote sensing data for operational applications across various sectors.[2] It was intended to be a follow on to RISAT-1 satellite with similar configuration. The satellite was developed by the ISRO and was the seventh in the series of RISAT satellites.[3][4][5]
Synthetic aperture radar can be used for Earth observation irrespective of the light and weather conditions of the area being imaged.[6] It complements/supplements data from Resourcesat, Cartosat and RISAT-2B Series.[7] The satellite carries a C-bandsynthetic-aperture radar (SAR) and has a liftoff mass of 1,710 kg (3,770 lb).[1] The EOS-09 orbit is expected to be in a polar and Sun-synchronous orbit at 05:30 AM LTDN, at approximate altitude of 529 km.[8]
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.[9][10]
^Krebs, Gunter (8 October 2021). "RISAT 1, 1A, 1B (EOS 04)". Gunter's Space Page. Archived from the original on 26 December 2021. Retrieved 26 December 2021.
Launches are separated by dots ( • ), payloads by commas ( , ), multiple names for the same satellite by slashes ( / ). Crewed flights are underlined. Launch failures are marked with the † sign. Payloads deployed from other spacecraft are (enclosed in parentheses).
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