[Isocops] Fwd: STF for Orbits 0129-30

[Mark Tapley]

Got it. Talked to Nathan about that, and I think I understand. When 
antennas are available might play into it as well. Anyway, when we 
get the final ATS, I'm hoping we have less than 23 hours off at 
apogee.

At 16:36 +0000 6/16/11, fair-play at comcast.net wrote:
>Mark,
>
>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).
>
>Ken
>
>----- Original Message -----
>From: "Mark Tapley" <mtapley at swri.edu>
>To: "IBEX Operator" <ibexops at lists.sr.unh.edu>, 
>isocops at lists.sr.unh.edu, IBEXOPS at gmail.com, "wesley sheral" 
><wesley.sheral at orbital.com>, "perry tim" <perry.tim at orbital.com>, 
>ibexops at orbital.com
>Cc: ibex-maneuver-engineering at lists.sr.unh.eduSent: 2:17:03 PM
>Subject: [Isocops] Fwd:  STF for Orbits 0129-30
>
>All,
>         Ken's edited .stf files for Orbits 129 and 130,
>IBEX_2011_163_o0129a_v001.stf and IBEX_2011_172_o0130a_v001.stf for
>have appeared.
>         Orbit 129's pointing vector,
>
>0.042788,0.92168,0.385584
>
>         is appropriate and safe for any time from now (June 16, 1423
>UTC) until sometime after the Descending macros prior to the Orbit
>130 apogee maneuver at 2011-06-25T14:01:00.000Z.
>
>
>[tapley at ena ~]$ ibex_rotate -o -u 0.042788,0.92168,0.385584 -w
>ibex-sun -t 2011-06-16T14:23:08.000Z
>Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
>   points axis  +1.000000,+0.000000,+0.000000
>   towards ECI  +0.042788,+0.921680,+0.385584
>   which is     R.A.  +87.342 Dec l. +22.6      R.A.  +84.613 Decl. 
>+23.322 (ibex-sun)
>   error is     R.A.   +2.729 Decl.  +0.642
>   for a total  2.593 deg
>[tapley at ena ~]$ ibex_rotate -o -u 0.042788,0.92168,0.385584 -w
>ibex-sun -t 2011-06-22T02:33:09.000Z
>Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
>   points axis  +1.000000,+0.000000,+0.000000
>   towards ECI  +0.042788,+0.921680,+0.385584
>   which is     R.A.  +87.342 Decl. +22.680
>   missing      R.A.  +90.219 Decl. +23.450 (ibex-sun)
>   error is     R.A.   +2.877 Decl.  +0.770
>   for a total  2.757 deg
>[tapley at ena ~]$ ibex_rotate -o -u 0.042788,0.92168,0.385584 -w
>ibex-sun -t 2011-06-25T13:27:10.000Z
>Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
>   points axis  +1.000000,+0.000000,+0 .000000< I 
> +0.042788,+0.921680,+0.385584
>   which is     R.A.  +87.342 Decl. +22.680
>   missing      R.A.  +93.918 Decl. +23.366 (ibex-sun)
>   error is     R.A.   +6.576 Decl.  +0.686
>   for a total  6.090 deg
>
>         In each case, Sun is appx. 0.7 deg north of the target
>vector, so the resulting actually achieved vector for a normal weekly
>repoint would be on the ecliptic. However, for the first maneuver
>after the Delta-V, if we are coming from our Delta-V pointing vector
>at ~RA 59, Dec 43, we need to think about a different offset unless
>we want to do a two-part slew, going first to ~RA 80, Dec 22.6 first
>and then to the target vector, RA 87, Dec 22.6 .
>
>         To preserve the procedure intact (after talking with Chelle)
>I'll generate a new offset poi nting ve e
>ibex-maneuver-engineering at lists.sr.unh.edu list for confirmation.
>
>         Ascent and descent macro times in 130a make sense wrt 15 Re
>times as given in PreADV2_MAC_Slides.pdf. However I note we are out
>of HV for 23 hours around apogee, which seems long.
>
>         Moon-in-FOV setback commands appear in the STF; I have not
>checked lunar predictions from .oef.
>
>         I think the ATS needs an updated target vector (see above).
>
>--
>                                                 - Mark     210-379-4635
>------------------------------------------------------------------ -----
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-- 
						- Mark     210-379-4635
-----------------------------------------------------------------------
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