<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: Arial; font-size: 10pt; color: #000000'>Mark,<div><br></div><div>The reason for the long period out of science mode at apogee in orbit 130 is because we normally use the OEF to determine the actual maneuver time and, based on that, determine when we can transition back to HV. There was no usable forecast OEF available for these orbits so we transition at the end of the window. We could manually adjust the times if necessary (or go through the forecast STF/forecast OEF generation process).</div><div><br></div><div>Ken</div><div><br>----- Original Message -----<br>From: "Mark Tapley" <mtapley@swri.edu><br>To: "IBEX Operator" <ibexops@lists.sr.unh.edu>, isocops@lists.sr.unh.edu, IBEXOPS@gmail.com, "wesley sheral" <wesley.sheral@orbital.com>, "perry tim" <perry.tim@orbital.com>, ibexops@orbital.com<br>Cc: ibex-maneuver-engineering@lists.sr.unh.edu<br>Sent: Thursday, June 16, 2011 12:17:03 PM<br>Subject: [Isocops] Fwd: STF for Orbits 0129-30<br><br>All,<br> Ken's edited .stf files for Orbits 129 and 130, <br>IBEX_2011_163_o0129a_v001.stf and IBEX_2011_172_o0130a_v001.stf for <br>have appeared.<br> Orbit 129's pointing vector,<br><br>0.042788,0.92168,0.385584<br><br> is appropriate and safe for any time from now (June 16, 1423 <br>UTC) until sometime after the Descending macros prior to the Orbit <br>130 apogee maneuver at 2011-06-25T14:01:00.000Z.<br><br><br>[tapley@ena ~]$ ibex_rotate -o -u 0.042788,0.92168,0.385584 -w <br>ibex-sun -t 2011-06-16T14:23:08.000Z<br>Quaternion +0.000000,+0.000000,+0.000000,+0.000000<br> points axis +1.000000,+0.000000,+0.000000<br> towards ECI +0.042788,+0.921680,+0.385584<br> which is R.A. +87.342 Decl. +22.680<br> missing R.A. +84.613 Decl. +23.322 (ibex-sun)<br> error is R.A. +2.729 Decl. +0.642<br> for a total 2.593 deg<br>[tapley@ena ~]$ ibex_rotate -o -u 0.042788,0.92168,0.385584 -w <br>ibex-sun -t 2011-06-22T02:33:09.000Z<br>Quaternion +0.000000,+0.000000,+0.000000,+0.000000<br> points axis +1.000000,+0.000000,+0.000000<br> towards ECI +0.042788,+0.921680,+0.385584<br> which is R.A. +87.342 Decl. +22.680<br> missing R.A. +90.219 Decl. +23.450 (ibex-sun)<br> error is R.A. +2.877 Decl. +0.770<br> for a total 2.757 deg<br>[tapley@ena ~]$ ibex_rotate -o -u 0.042788,0.92168,0.385584 -w <br>ibex-sun -t 2011-06-25T13:27:10.000Z<br>Quaternion +0.000000,+0.000000,+0.000000,+0.000000<br> points axis +1.000000,+0.000000,+0.000000<br> towards ECI +0.042788,+0.921680,+0.385584<br> which is R.A. +87.342 Decl. +22.680<br> missing R.A. +93.918 Decl. +23.366 (ibex-sun)<br> error is R.A. +6.576 Decl. +0.686<br> for a total 6.090 deg<br><br> In each case, Sun is appx. 0.7 deg north of the target <br>vector, so the resulting actually achieved vector for a normal weekly <br>repoint would be on the ecliptic. However, for the first maneuver <br>after the Delta-V, if we are coming from our Delta-V pointing vector <br>at ~RA 59, Dec 43, we need to think about a different offset unless <br>we want to do a two-part slew, going first to ~RA 80, Dec 22.6 first <br>and then to the target vector, RA 87, Dec 22.6 .<br><br> To preserve the procedure intact (after talking with Chelle) <br>I'll generate a new offset pointing vector and distribute to the <br>ibex-maneuver-engineering@lists.sr.unh.edu list for confirmation.<br><br> Ascent and descent macro times in 130a make sense wrt 15 Re <br>times as given in PreADV2_MAC_Slides.pdf. However I note we are out <br>of HV for 23 hours around apogee, which seems long.<br><br> Moon-in-FOV setback commands appear in the STF; I have not <br>checked lunar predictions from .oef.<br><br> I think the ATS needs an updated target vector (see above).<br><br>-- <br> - Mark 210-379-4635<br>-----------------------------------------------------------------------<br>Large Asteroids headed toward planets<br>inhabited by beings that don't have<br>technology adequate to stop them:<br><br> Think of it as Evolution in Fast-Forward.<br><br>Please restrict discussions on this email list to non-ITAR sensitive topics.<br>______________________________________________<br>Isocops mailing list<br>Isocops@lists.sr.unh.edu<br>http://lists.sr.unh.edu/mailman/listinfo/isocops<br></div></div></body></html>