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Astrométrie et photométrie des astéroïdes observés par le satellite Hipparcos

Abstract : The ESA Hipparcos satellite not only yields great precision results for star positions and proper motions but it also provides valuable results on minor planets photometric and astrometric data. The aim of this thesis is the reduction to astrometric positions for the 48 minor planets observed during the Hipparcos mission, from November 1989 to march 1993. This thesis deals also with the tie between the Hipparcos reference system and the dynamical system as defined by the minor planets. In the first part, a presentation of the reference systems and reference frames notions is made. Some historical points to the constructions of fundamental catalogues and the value of minor planets observations to determine the dynamical frame are related. Then we present the Hipparcos observations, and the general pre-reduction scheme that yields the observational data we are working with. We give a short description of the planets observed and the ephemerides used in this study. The photometric reply for a resolved object is studied. Further the reduction of the observed positions to astrometric directions is developed, this reduction has to take into account small effects up to the milli-arcsecond level which is uncommon for minor planets observations. A twenty seconds averaged normal place is defined providing thus minor planets positions accurate to about 0’’.010 ~ 0’’.015. Astrometric residuals were used for the Hipparcos-planetary frame tie. The link obtained is of great precision when compared to the time span covered by the observations, or to previous link to fundamental catalogues by using ground-based observations of minor planets. The ecliptical plane is tied to the Hipparcos sphere with an accuracy of 0’’.002 and 0’’.002/year, and the mean equinox of epoch J 2000 is tied to this sphere with an accuracy of 0’’.002 and 0’’.003/year.
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Daniel Hestroffer. Astrométrie et photométrie des astéroïdes observés par le satellite Hipparcos. Astrophysique [astro-ph]. Observatoire de Paris, 1994. Français. ⟨tel-02095452⟩

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