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<p class="MsoNormal"><span style="color:#1F497D">Hi Dan<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Regarding “ONSTATION” elements it seems our documentation is a little inconsistent and they are also referred to as “Adapted (or non-singular) orbit elements” for which there appears to be many definitions depending
on their use, our definition is as follows:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt;text-autospace:none"><b><span style="font-size:11.5pt;font-family:"Garamond","serif"">Adapted (or non singular) orbit parameters<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-left:36.0pt;text-autospace:none"><span style="font-size:11.5pt;font-family:"Times New Roman","serif"">a
</span><span style="font-size:11.5pt;font-family:"Garamond","serif"">semi-major axis (km)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt;text-autospace:none"><span lang="FR" style="font-size:11.5pt;font-family:"Times New Roman","serif"">ex = e cos(</span><span style="font-size:11.5pt;font-family:Symbol">w
</span><span lang="FR" style="font-size:11.5pt;font-family:"Times New Roman","serif"">+
</span><span style="font-size:11.5pt;font-family:Symbol">W</span><span lang="FR" style="font-size:11.5pt;font-family:"Times New Roman","serif"">)
</span><span lang="FR" style="font-size:11.5pt;font-family:"Garamond","serif"">eccentricity vector<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt;text-autospace:none"><span style="font-size:11.5pt;font-family:"Times New Roman","serif"">ey = e sin(</span><span style="font-size:11.5pt;font-family:Symbol">w
</span><span style="font-size:11.5pt;font-family:"Times New Roman","serif"">+ </span>
<span style="font-size:11.5pt;font-family:Symbol">W</span><span style="font-size:11.5pt;font-family:"Times New Roman","serif"">)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt;text-autospace:none"><span style="font-size:11.5pt;font-family:"Times New Roman","serif"">ix = sin i cos(</span><span style="font-size:11.5pt;font-family:Symbol">W</span><span style="font-size:11.5pt;font-family:"Times New Roman","serif"">)
</span><span style="font-size:11.5pt;font-family:"Garamond","serif"">inclination vector<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt;text-autospace:none"><span style="font-size:11.5pt;font-family:"Times New Roman","serif"">iy = sin i sin(</span><span style="font-size:11.5pt;font-family:Symbol">W</span><span style="font-size:11.5pt;font-family:"Times New Roman","serif"">)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt;text-autospace:none"><span style="font-size:11.5pt;font-family:Symbol">l</span><span style="font-size:11.5pt;font-family:"Times New Roman","serif""> =
</span><span style="font-size:11.5pt;font-family:Symbol">w </span><span style="font-size:11.5pt;font-family:"Times New Roman","serif"">+
</span><span style="font-size:11.5pt;font-family:Symbol">W </span><span style="font-size:11.5pt;font-family:"Times New Roman","serif"">+ M -
</span><span style="font-size:11.5pt;font-family:Symbol">q </span><b><span style="font-size:11.5pt;font-family:"Times New Roman","serif"">or</span></b><span style="font-size:11.5pt;font-family:Symbol"> w
</span><span style="font-size:11.5pt;font-family:"Times New Roman","serif"">+ </span>
<span style="font-size:11.5pt;font-family:Symbol">W </span><span style="font-size:11.5pt;font-family:"Times New Roman","serif"">+ v -
</span><span style="font-size:11.5pt;font-family:Symbol">q </span><span style="font-size:11.5pt;font-family:"Garamond","serif"">mean
<b>or </b>true longitude (deg)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt;text-autospace:none"><span style="font-size:11.5pt;font-family:Symbol">q
</span><span style="font-size:11.5pt;font-family:"Garamond","serif"">is the sidereal time</span><span style="font-size:11.5pt;font-family:"Times New Roman","serif"">.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.5pt;font-family:"Garamond","serif"">For small values of inclination, ix & iy can be considered as angles and displayed in degrees.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.5pt;font-family:"Garamond","serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Best Regards<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Brian<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> MOIMS-NAV-EXEC [mailto:moims-nav-exec-bounces@mailman.ccsds.org]
<b>On Behalf Of </b>Oltrogge, Daniel<br>
<b>Sent:</b> 20 February 2018 22:45<br>
<b>To:</b> Berry, David S (3920); moims-nav-exec@mailman.ccsds.org<br>
<b>Subject:</b> [MOIMS-NAV-EXEC] Draft update to Time scales, reference frames, element sets content<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><a name="_MailEndCompose"><span lang="EN-US" style="color:#1F497D">All –
<o:p></o:p></span></a></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Thanks to additional help from Vallado and Patrick, we’ve continued to evolve the draft SANA content.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">“Track Changes” has been enabled so that you can see the proposed modifications.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Brian Swinburne – Note that per your request (I didn’t forget!), I’ve added “ONSTATION” elements. But I believe that there may be several such definitions. Please research the specific version
that you are using and provide me with a detailed description that we can replace my draft (placeholder) text with.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">David, with the exception of this replacement text from Brian, I believe that this document version may be ready for all to review to ensure that it meets the needs of the organizations that each
of us represent.<o:p></o:p></span></p>
<div>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Dan<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Daniel L. Oltrogge<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Director, Center for Space Standards and Innovation<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Analytical Graphics, Incorporated<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR" style="color:#1F497D">Voice: 719-482-4552 </span>
<span lang="EN-US" style="font-size:13.5pt;color:#1F497D">҉</span><span lang="FR" style="color:#1F497D"> E-mail:
</span><a href="mailto:oltrogge@agi.com"><span lang="FR">oltrogge@agi.com</span></a><span lang="FR" style="color:#1F497D"><o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span lang="FR" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="FR"><o:p> </o:p></span></p>
</div>
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