=========================== =========================== IMCCE - Observatoire de Paris /pub/ephem/planets/anneauxSaturn 1999, March 29 =========================== ============================ planets/anneauxSaturn We give here Chebychev polynomials allowing to compute the geometrical parameters for the physical ephemerides of the Saturnian rings with low precision. AUTHORS : W. Thuillot ADDRESS : IMCCE - Observatoire de Paris 77 av. Denfert Rochereau, F-75014 PARIS Phone: (1) 40 51 21 28 Fax: (1) 46 33 28 34 e-mail: thuillot@imcce.fr CONTENTS: anneaux.f : example of program for the use of the Chebychev polynomials to compute the following parameters: X: the Earth-Saturn distance (UA) in order to get a scale factor Y: the aperture of the rings: ratio of small axis to the large one (sign + if the North face of the rings is visible) Z: position angle (radians) of the small axis of the ellips of the rings with respect to the North (positive from East to North) eletcXX : Chebychev coefficients allowing to compute the three geometric parameters X, Y, Z for the year XX. ================================================================================ User feed-back is encouraged. Unless otherwise specified, send comments and bug reports to: E-mail : comments@imcce.fr Fax : (33) 1 46 33 28 34 Postal mail: IMCCE - Observatoire de Paris 77 avenue Denfert Rochereau F-75014 PARIS ================================================================================