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ID Project Category View Status Date Submitted Last Update 0000001 Memorandum Series Memorandum #1: Keplerian Orbit Elements to Cartesian State Vectors public 2013-04-30 10:11 2013-04-30 21:28 anonymous DigNative normal minor have not tried closed fixed 0000001: Step 6 - Error in the transformation formula 8 and 9 Hi, As I was looking for Keplerian orbit elements, I found your memo. Great work, with nice présentation, références. I thinks there is an error in the formulas 8 and 9, where o stands for Omega, the longitude of the ascending node Actual Formula is :  x*(cos(o)*cos(w) - cos(i)*sin(o)*sin(w)) - y*(cos(o)*sin(w) + cos(i)*cos(w)*sin(o)) x*(cos(w)*sin(o) - cos(i)*cos(o)*sin(w)) - y*(sin(o)*sin(w) - cos(i)*cos(o)*cos(w)) x*sin(i)*sin(w) + y*cos(w)*sin(i) The correct formula is :  x*(cos(o)*cos(w) - cos(i)*sin(o)*sin(w)) - y*(cos(o)*sin(w) + cos(i)*cos(w)*sin(o)) x*(cos(w)*sin(o) + cos(i)*cos(o)*sin(w)) - y*(sin(o)*sin(w) - cos(i)*cos(o)*cos(w)) x*sin(i)*sin(w) + y*cos(w)*sin(i) Best Regards Frederic Baudrand fbaudrand@free.fr No tags attached.

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 2013-04-30 21:28 administrator   ~0000001 Hi Frederic, thank you very much for your bug report. Of course you are right --- there was a minus sign, were a plus sign had to be. The typo has now been corrected; you can find the corrected version in my download center. I appreciate your efforts. Kind regards, René