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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:Courier"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:Courier">Hi Brian, Dan:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:Courier"><o:p> </o:p></span></p>
<p class="p1"><span style="font-size:12.0pt;font-family:Courier">The first paragraph here suggests to me that the "ONSTATION" elements would not be appropriate for incorporation in a standard (rationale: "inconsistent", "adapted", "many definitions depending
on their use"). I think these could be appropriate for an </span><span style="font-size:12.0pt;font-family:Courier">ICD (</span><span style="font-size:12.0pt;font-family:Courier">Interface Control Document), but they sound to be de facto non-standardized.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:Courier"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:Courier">David<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:Courier"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:Courier"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:Courier"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">"SWINBURNE, Brian [UK]" <brian.swinburne@airbus.com><br>
<b>Date: </b>Wednesday, February 21, 2018 at 3:29 AM<br>
<b>To: </b>"Oltrogge, Daniel" <doltrogge@agi.com>, "Berry, David S (3920)" <david.s.berry@jpl.nasa.gov>, "moims-nav-exec@mailman.ccsds.org" <moims-nav-exec@mailman.ccsds.org><br>
<b>Subject: </b>RE: [MOIMS-NAV-EXEC] Draft update to Time scales, reference frames, element sets content<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><a name="_MailOriginalBody"><span style="color:#1F497D">Hi Dan</span><o:p></o:p></a></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><span style="color:#1F497D"> </span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><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:</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><span style="color:#1F497D"> </span><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in;text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"><b><span style="font-size:11.5pt;font-family:Garamond">Adapted (or non singular) orbit parameters</span></b><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in;text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:"Times New Roman",serif">a
</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:Garamond">semi-major axis (km)</span><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in;text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"><span lang="FR" style="font-size:11.5pt;font-family:"Times New Roman",serif">ex = e cos(</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:Symbol">w
</span></span><span style="mso-bookmark:_MailOriginalBody"><span lang="FR" style="font-size:11.5pt;font-family:"Times New Roman",serif">+
</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:Symbol">W</span></span><span style="mso-bookmark:_MailOriginalBody"><span lang="FR" style="font-size:11.5pt;font-family:"Times New Roman",serif">)
</span></span><span style="mso-bookmark:_MailOriginalBody"><span lang="FR" style="font-size:11.5pt;font-family:Garamond">eccentricity vector</span><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in;text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:"Times New Roman",serif">ey = e sin(</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:Symbol">w
</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:"Times New Roman",serif">+
</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:Symbol">W</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:"Times New Roman",serif">)</span><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in;text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:"Times New Roman",serif">ix = sin i cos(</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:Symbol">W</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:"Times New Roman",serif">)
</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:Garamond">inclination vector</span><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in;text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:"Times New Roman",serif">iy = sin i sin(</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:Symbol">W</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:"Times New Roman",serif">)</span><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in;text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:Symbol">l</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:"Times New Roman",serif">
= </span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:Symbol">w
</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:"Times New Roman",serif">+
</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:Symbol">W
</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:"Times New Roman",serif">+ M -
</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:Symbol">q
</span></span><span style="mso-bookmark:_MailOriginalBody"><b><span style="font-size:11.5pt;font-family:"Times New Roman",serif">or</span></b></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:Symbol"> w
</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:"Times New Roman",serif">+
</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:Symbol">W
</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:"Times New Roman",serif">+ v -
</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:Symbol">q
</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt"> </span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:Symbol">
</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:Garamond">mean
<b>or </b>true longitude (deg)</span><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in;text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:Symbol">q
</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:Garamond">is the sidereal time</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:"Times New Roman",serif">.</span><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:Garamond">For small values of inclination, ix & iy can be considered as angles and displayed in degrees.</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:11.5pt;font-family:Garamond"> </span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><span style="color:#1F497D">Best Regards</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><span style="color:#1F497D"> </span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><span style="color:#1F497D">Brian</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><span style="color:#1F497D"> </span><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">From:</span></b></span><span style="mso-bookmark:_MailOriginalBody"><span 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</span><o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><span style="color:#1F497D">All –
</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><span style="color:#1F497D"> </span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><span style="color:#1F497D">Thanks to additional help from Vallado and Patrick, we’ve continued to evolve the draft SANA content.</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><span style="color:#1F497D"> </span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><span style="color:#1F497D">“Track Changes” has been enabled so that you can see the proposed modifications.</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><span style="color:#1F497D"> </span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><span 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.</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><span style="color:#1F497D"> </span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><span 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.</span><o:p></o:p></span></p>
<div>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><span style="color:#1F497D"> </span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><span style="color:#1F497D">Dan</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><span style="color:#1F497D"> </span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><span style="color:#1F497D">Daniel L. Oltrogge</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><span style="color:#1F497D">Director, Center for Space Standards and Innovation</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><span style="color:#1F497D">Analytical Graphics, Incorporated</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><span lang="FR" style="color:#1F497D">Voice: 719-482-4552
</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:13.5pt;color:#1F497D">҉</span></span><span style="mso-bookmark:_MailOriginalBody"><span lang="FR" style="color:#1F497D"> E-mail:
</span></span><a href="mailto:oltrogge@agi.com"><span style="mso-bookmark:_MailOriginalBody"><span lang="FR">oltrogge@agi.com</span></span><span style="mso-bookmark:_MailOriginalBody"></span></a><span style="mso-bookmark:_MailOriginalBody"><o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><span lang="FR" style="color:#1F497D"> </span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><span lang="FR"> </span><o:p></o:p></span></p>
<p><span style="mso-bookmark:_MailOriginalBody">**********************************************************************<o:p></o:p></span></p>
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