https://opera.cnes.fr/index.php?action=history&feed=atom&title=What_is_OperaWhat is Opera - Historique des versions2026-04-17T20:22:39ZHistorique des versions pour cette page sur le wikiMediaWiki 1.43.8https://opera.cnes.fr/index.php?title=What_is_Opera&diff=391&oldid=prevAdmin le 20 janvier 2020 à 16:172020-01-20T16:17:43Z<p></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Version du 20 janvier 2020 à 16:17</td>
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<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><font color=#556B2F>'''OPERA'''</font> is a [https://cnes.fr/fr '''CNES'''] tool allowing to estimate long and middle term Earth reentry dates (some months to one week in advance) thanks to <font color=#FF8C00 title="Two Lines Elements">TLE</font> <del style="font-weight: bold; text-decoration: none;">and </del>allows also to compute the information on other parameters as <font color=#FF8C00 title="Surface on Mass ratio">S/M</font> or maneuvers previously occured. <font color=#556B2F>'''OPERA'''</font> is <del style="font-weight: bold; text-decoration: none;">also </del>able to generate automatic <font color=#FF8C00 title="Portable Document Format">PDF</font> reports with a synthesis of maneuver activity of a given object.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><font color=#556B2F>'''OPERA'''</font> is a [https://cnes.fr/fr '''CNES'''] tool allowing to estimate long and middle term Earth reentry dates (some months to one week in advance) thanks to <font color=#FF8C00 title="Two Lines Elements">TLE</font><ins style="font-weight: bold; text-decoration: none;">.</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">It </ins>allows also to compute the information on other parameters as <font color=#FF8C00 title="Surface on Mass ratio">S/M</font> or maneuvers previously occured.</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">At last, </ins><font color=#556B2F>'''OPERA'''</font> is able to generate automatic <font color=#FF8C00 title="Portable Document Format">PDF</font> reports with a synthesis of maneuver activity of a given object.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><font color=#556B2F>'''OPERA'''</font> is usable via three modes:</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><font color=#556B2F>'''OPERA'''</font> is usable via three modes:</div></td></tr>
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</table>Adminhttps://opera.cnes.fr/index.php?title=What_is_Opera&diff=390&oldid=prevAdmin : Page créée avec « <font color=#556B2F>'''OPERA'''</font> is a [https://cnes.fr/fr '''CNES'''] tool allowing to estimate long and middle term Earth reentry dates (some months to one week in... »2020-01-20T16:16:57Z<p>Page créée avec « <font color=#556B2F>'''OPERA'''</font> is a [https://cnes.fr/fr '''CNES'''] tool allowing to estimate long and middle term Earth reentry dates (some months to one week in... »</p>
<p><b>Nouvelle page</b></p><div><font color=#556B2F>'''OPERA'''</font> is a [https://cnes.fr/fr '''CNES'''] tool allowing to estimate long and middle term Earth reentry dates (some months to one week in advance) thanks to <font color=#FF8C00 title="Two Lines Elements">TLE</font> and allows also to compute the information on other parameters as <font color=#FF8C00 title="Surface on Mass ratio">S/M</font> or maneuvers previously occured. <font color=#556B2F>'''OPERA'''</font> is also able to generate automatic <font color=#FF8C00 title="Portable Document Format">PDF</font> reports with a synthesis of maneuver activity of a given object.<br />
<br />
<font color=#556B2F>'''OPERA'''</font> is usable via three modes:<br />
* <font color=#FF8C00 title="Graphical User Interface">GUI</font>: its utilization is made user-friendly thanks to a graphical user interface (developed using [[http://genius.cnes.fr GENIUS]] and [[http://genopus.cnes.fr GENOPUS]]),<br />
* Batch,<br />
* Library via its <font color=#FF8C00>Java</font> interface.<br />
<br />
Its initialization is made by:<br />
* A list of initial orbital parameters thanks to <font color=#FF8C00 title="Two Lines Elements">TLE</font>,<br />
* Solar activity files,<br />
* Several other specific parameters as the reentry altitude or how to filter <font color=#FF8C00 title="Two Lines Elements">TLE</font> inputs.<br />
<br />
For flight dynamics aspects, <font color=#556B2F>'''OPERA'''</font> is fully based on the [[http://patrius.cnes.fr PATRIUS]] library and specially about the orbit extrapolation, the propagation is done thanks to the [[https://logiciels.cnes.fr/en/content/stela STELA]] propagator that allows to get interesting <font color=#FF8C00 title="Central Processing Unit">CPU</font> time by comparison to a full numerical propagator while keeping sufficient precision relative to the reentry date.</div>Admin