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Spacecraft VLBI and Doppler tracking: algorithms and implementation

Molera Calvés, G.; Gurvits, L. I.; Duev, D. A. +3 more

Aims: We present the results of several multi-station Very Long Baseline Interferometry (VLBI) experiments conducted with the ESA spacecraft Venus Express as a target. To determine the true capabilities of VLBI tracking for future planetary missions in the solar system, it is necessary to demonstrate the accuracy of the method for existing op…

Transmission spectrum of Venus as a transiting exoplanet

Tanga, P.; Ehrenreich, D.; Vidal-Madjar, A. +6 more

On 5-6 June 2012, Venus will be transiting the Sun for the last time before 2117. This event is an unique opportunity to assess the feasibility of the atmospheric characterisation of Earth-size exoplanets near the habitable zone with the transmission spectroscopy technique and provide an invaluable proxy for the atmosphere of such a planet. In thi…