[hal-01110569] On the determination and constancy of the solar oblateness

The Picard space mission aims to measure Solar equator-to-pole radius difference with a precision better than 0.5 mas. The Solar Diameter Imager and Surface Mapper (SODISM) on board Picard is a Ritchey-Chretien telescope that takes images of the Sun at several wavelengths. The SODISM measurements of the solar shape are obtained during special roll maneuvers of the spacecraft by 30o steps. They have produced precise determination of the solar oblateness at 782.2 nm.



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