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India satellite Bhaskara II

India satellite Bhaskara II was launched on November 20, 1981, from Kapustin Yar onboard the Inter¬cosmos launch vehicle. The main objectives of Bhaskara-II, similar to Bhaskara-I, were to conduct earth observation experiments for applications related to hydrology, forestry, and geology using the two band television camera system operating in the 0.54 to 0.66 microns visible band and 0.75 to 0.85-micron near-infrared band and to conduct ocean-surface studies using Satellite Microwave Radiometer (SAMIR) operating at 19.35, 22.235 & 31.4 GHz frequency band.

Bhaskara-I, weighing 444 kg at launch, was launched on 7 June 1979 from Kapustin Yar aboard the Intercosmos launch vehicle. It was placed in an orbital Perigee and Apogee of 394 km and 399 km at an inclination of 50.7°. The satellite consisted of Two television cameras operating in visible from 600 nanometres and near-infrared 800 nanometres and collected data related to hydrology, forestry, and geology.

Satellite microwave radiometer (SAMIR) operating at 19 and 22 GHz for the study of ocean-state, water vapor, the liquid water content in the atmosphere, etc. An X-ray sky monitor operating in 2-10 keV energy range, to detect transient X-ray sources and monitor long term spectral and intensity changes in the X-ray sources.

The satellite provided ocean and land surface data. It orbited at 541 x 557 km with an inclination of 50.7°. One of two onboard cameras malfunctioned, however it sent back more than two thousand images. Housekeeping telemetry was received until re-entry in 1991.

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