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Simulation of apparent brightness of the spacecraft “Spectr-R” for planning astrometric observations
Engineering Education # 05, May 2013
DOI: 10.7463/0513.0571011
A radio telescope which is ten meters in diameter was placed on the operational orbit of the artificial Earth satellite on July 18, 2011. This telescope was mounted at spacecraft “Spectr-R” and designed for consistent radio interferometer observations of remote sources together with Earth stations. Success of this scientific project significantly depends on the accuracy of the calculated orbit of the space radio telescope. Astrometric observations are one of many information sources that were used for adjustment of the spacecraft’s orbit. Due to considerable evolution of the orbit observations were taken by means of target indication. Besides the position on the celestial sphere, a predicted value of apparent brightness is also used to identify the object. In case of “Spectr-R” this brightness can vary essentially during the flight. A model for calculation of apparent brightness of the spacecraft “Spectr-R” is presented in this work. Key parameters of this model were obtained from the analysis of telemetric and photometric data.
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