Spacecraft development

Major features of the study design Use of large aperture independent telescopes. No need for high accuracymechanisms (nanometric positioning accuracy required for the case of aninterferometer) Common telescope for ARVI & narrow-band photometry (Arvi PhotometerTelescope). Feasible detectors, pixel dimensions > 9 µm, Short term basic angle stability ensured by the use of Silicon Carbide for both thereflectors and the structure, Implementation of a device capable of monitoring basic angle variations with anaccuracy compatible with Gaia needs ARVI (Auxiliary Radial Velocity Instrument) located on the symmetry axis Design compatible with Ariane V launcher and ESA assigned cornerstone budgetOptical assembly configurationASTRO-1 focal planeASTRO-1 secondary mirrorBasic anglemonitoring deviceASTRO-2 primary mirrorASTRO-1 primary mirrorASTRO-1 tertiary mirror