The Solar Oblateness Measured On Board The PICARD Spacecraft, and The Solar Disk Sextant Instrument

The PICARD Spacecraft was launched on 15 June 2010. It carries four instruments. One of them, SODISM is an imaging telescope with a 2K x 2K CCD detector, dedicated to the measurement of the solar diameter and the limb shape. Although the data processing is still in a validation phase, we can already present some preliminary results concerning the solar oblateness. These measurements are obtained during a special operation in which the spacecraft turns around the Sun direction. The rotation, made by 300 angular increments, allows us to determine the instrument optical distortion and the solar oblateness. The method used to extract this information will be described. We shall present the preliminary results as a function of wavelength, and compare them with measurements obtained with the SDS instrument, and with the predictions from theoretical modeling.

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Source American Geophysical Union, Fall Meeting 2011
Author Thuillier, Gérard, Hauchecorne, Alain, Sofia, Sabatino, Girard, Terry, Hochedez, Jean-François, Irbah, Abdanour, Marcovici, Jean-Pierre, Meissonnier, Mireille, Meftah, Mustapha, Sofia, U. J.
Maintainer CCSD
Last Updated May 15, 2026, 15:41 (UTC)
Created May 15, 2026, 15:41 (UTC)
Identifier hal-00709882
Language en
contributor STRATO - LATMOS ; Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS) ; Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
coverage San Francisco, United States
creator Thuillier, Gérard
date 2011-12-15T00:00:00
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harvest_source_id 3374d638-d20b-4672-ba96-a23232d55657
harvest_source_title test moissonnage SELUNE
metadata_modified 2025-04-23T00:00:00
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