Thanks a lot for your reply. What I need is the first case but when I try to create a coordinate system with the origin at the default SC of type BodyFixed, I get this error:
[cid:image001.png@01D7AE0B.17C308D0] Christian Ruel T +1.514.369.5706 x 238 From: Roychowdhury, Debdeep <roychowdh...@campus.tu-berlin.de> Sent: Thursday, September 16, 2021 5:55 AM To: Christian Ruel <christian.r...@mayahtt.com> Cc: gmat-users@lists.sourceforge.net <gmat-users@lists.sourceforge.net> <gmat-users@lists.sourceforge.net> Subject: AW: [Gmat-users] Body fixed coordinate system Hi Christian, It is not clear to me if you just want to have the Sun and planet coordinates in the SC default coordinate system or if you want to define a new SC coordinate system based on the Sun's position (as you mentioned in your last question). Both are easy. For the first one, just create a new coordinate System with the origin at the SC and "Type" BodyFixed. Then you can record the Sun's coordinates in this SC coordinate system. For the second case, choose the "Type" as ObjectReferenced and keep the origin at the SC. Choose your primary as the SC and the secondary as the Sun. If you want the SC coordinate system's X axis to be the Sun vector from the SC, then choose your X as "R". You can read more about this in the help document. Have a look at the coordinate systems and the report files in the script I attached with this email. Regards, Debdeep Roychowdhury Gesendet von Mail<https://go.microsoft.com/fwlink/?LinkId=550986> für Windows Von: Christian Ruel<mailto:christian.r...@mayahtt.com> Gesendet: Montag, 13. September 2021 20:01 An: gmat-users@lists.sourceforge.net<mailto:gmat-users@lists.sourceforge.net> Betreff: [Gmat-users] Body fixed coordinate system Hello, I am trying to create a coordinate system that would be fixed to the default spacecraft (SC) that would allow to get sun and planet vectors in the SC coordinate system (vector origin at the origin of the SC coord system and pointing to the sun and planet respectively). When I create such a CS now but change the attitude of the SC the SC coordinate system remain unchanged - is unaffected by the change in attitude. How to have a general way of defining such a coordinate system that would 'follow' the attitude when it is modified? More specifically how should the coordinate system be defined if the attitude reference body is the sun? thanks Christian Ruel
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