https://patrius.cnes.fr/index.php?action=history&feed=atom&title=Tutorials_4.5.1_Orbits 2026-04-04T11:39:20Z Historique des versions pour cette page sur le wiki MediaWiki 1.43.6 https://patrius.cnes.fr/index.php?title=Tutorials_4.5.1_Orbits&diff=2684&oldid=prev 2020-08-17T08:59:07Z

<p>Page créée avec « == What is an orbit ? == An orbit is defined with a &lt;font color=#FF0000&gt;date&lt;/font&gt;, a &lt;font color=#FF0000&gt;frame&lt;/font&gt; then &lt;font color=#FF0000&gt;orbital parameters&lt;/font&gt;... »</p> <p><b>Nouvelle page</b></p><div>== What is an orbit ? ==<br /> <br /> An orbit is defined with a &lt;font color=#FF0000&gt;date&lt;/font&gt;, a &lt;font color=#FF0000&gt;frame&lt;/font&gt; then &lt;font color=#FF0000&gt;orbital parameters&lt;/font&gt;; in the example below, we will use keplerian parameters ...<br /> * semi major axis<br /> * eccentricity<br /> * inclination<br /> * perigee argument<br /> * right ascension of the ascending node<br /> * anomaly (mean, true, eccentric)<br /> <br /> Note that it is mandatory to set the &quot;Mu&quot; value (gravitational constant) for both reasons :<br /> # to be able to convert keplerian parameters to cartesian ones<br /> # to propagate this orbit using the keplerian motion (considering only the central term) (for more sophisticated propagations (analytical or numerical ones) see specific tutorials).<br /> <br /> &#039;&#039;&#039;Code example:&#039;&#039;&#039; [[CreateKeplerianOrbit_4.5.1|create a Keplerian orbit]]<br /> <br /> == Orbital parameters ==<br /> <br /> Rather than to set directly orbital parameters when creating an orbit (see previous tutorial), it is possible to go through an intermediate object including these orbital parameters.<br /> <br /> Then to create an orbit, we will have to set the &lt;font color=#FF0000&gt;date&lt;/font&gt;, the &lt;font color=#FF0000&gt;frame&lt;/font&gt; ... and this object.<br /> <br /> Moreover, the advantage of this sublevel is to treat parameters conversions without considering a whole orbit (for example, to convert &lt;font color=#FF0000&gt;keplerian&lt;/font&gt; parameters in &lt;font color=#FF0000&gt;cartesian&lt;/font&gt; ones, it is not necessary to use a &lt;font color=#FF0000&gt;date&lt;/font&gt; or a &lt;font color=#FF0000&gt;frame&lt;/font&gt;).<br /> <br /> &#039;&#039;&#039;Code example:&#039;&#039;&#039; [[CreateKeplerianOrbitUsingParameters_4.5.1|create a Keplerian orbit using parameters]]<br /> <br /> == Reentry parameters ==<br /> <br /> In case of atmospheric reentry trajectories, it could be useful to get specific &quot;reentry parameters&quot; defined in an inertial or even rotating frame. The following code gives some examples ...<br /> <br /> &#039;&#039;&#039;Code example:&#039;&#039;&#039; [[Reentryparameters_4.5.1|Reentry parameters]]<br /> <br /> == Orbital parameters conversions ==<br /> <br /> As explained in the previous tutorial, it is possible to make a lot of conversion between different orbital parameters formats. The following code gives some examples ...<br /> <br /> &#039;&#039;&#039;Code example:&#039;&#039;&#039; [[ParametersConversions_4.5.1|orbital parameters conversions]]<br /> <br /> [[Category:Tutorials 4.5.1]]</div>

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