[Isocops] IBEX Orbit# 221 ATS (25 Sept 13 - 4 Oct 13) - v001 approval
Reno, Michelle
mreno at swri.edu
Sat Sep 14 13:17:00 EDT 2013
I approve IBEX_2013_268_o0221a_v001.scr
On Sep 13, 2013, at 7:38 PM, "Ken Fairchild" <fair-play at comcast.net> wrote:
> All,
>
> I have looked at the orbit 221 ATS,
>
> IBEX_2013_268_o0221a_v001.scr,
>
> and I approve.
>
> There are no constraint violations in
>
> IBEX_2013_268_o0221a_v001.ccvr.
>
> The PL commands in the v001 ATS match those in the v002 STF,
>
> IBEX_2013_268_o0221a_v002.stf.
>
> Ascending and descending command sequences are consistent with each other and 15 Re ascending, the apogee maneuver time and 15 Re descending as determined from the OEF,
>
> IBEX_2013_268_o0221a_v001.oef,
>
> and as verified with ibex_orbit.
>
> There is one star tracker outage. It starts about 1 1/2 hours after perigee and ends about 8 hours later. No despinning should be required due to this outage.
>
> There is one moon in Lo FOV session in arc A. The ATS start time is about 7 hours after that in the OEF and the ATS end time is about 4 hours after that in the OEF. These differences are not unusual.
>
> The ground station command sequences are correct and the timing and bit rates match those in the contacts file,
>
> IBEX_Orbit221Contacts.txt,
>
> for all contacts (3).
>
> We are doing battery cell balancing this orbit and the balancing commands are correct and offset by enough time from other commands.
>
> The inertial maneuver at perigee of orbit 220 left us pointing in safe directions for orbit 221 arc A ascending and descending sequences:
>
> ibex_rotate -o -u -0.99995,0.003299,-0.00946 -w ibex-sun -t 2013/09:26:00:02:34
> Quaternion +0.000000,+0.000000,+0.000000,+0.000000
> points axis +1.000000,+0.000000,+0.000000
> towards ECI -0.999950,+0.003299,-0.009460
> which is R.A. +179.811 Decl. -0.542
> missing R.A. +182.621 Decl. -1.137 (ibex-sun)
> error is R.A. +2.810 Decl. +0.595
> for a total 2.872 deg
>
> ibex_rotate -o -u -0.99995,0.003299,-0.00946 -w ibex-sun -t 2013/09:29:17:58:42
> Quaternion +0.000000,+0.000000,+0.000000,+0.000000
> points axis +1.000000,+0.000000,+0.000000
> towards ECI -0.999950,+0.003299,-0.009460
> which is R.A. +179.811 Decl. -0.542
> missing R.A. +185.935 Decl. -2.603 (ibex-sun)
> error is R.A. +6.124 Decl. +2.061
> for a total 6.459 deg
>
> The inertial maneuver at apogee leaves us pointing in safe directions at the time of the maneuver and for arc B ascending and descending sequences:
>
> ibex_rotate -o -u -0.996737,-0.069489,-0.041073 -w ibex-sun -t 2013/09:29:19:41:50
> Quaternion +0.000000,+0.000000,+0.000000,+0.000000
> points axis +1.000000,+0.000000,+0.000000
> towards ECI -0.996737,-0.069489,-0.041073
> which is R.A. +183.988 Decl. -2.354
> missing R.A. +186.000 Decl. -2.631 (ibex-sun)
> error is R.A. +2.012 Decl. +0.277
> for a total 2.029 deg
>
> ibex_rotate -o -u -0.996737,-0.069489,-0.041073 -w ibex-sun -t 2013/09:29:21:16:56
> Quaternion +0.000000,+0.000000,+0.000000,+0.000000
> points axis +1.000000,+0.000000,+0.000000
> towards ECI -0.996737,-0.069489,-0.041073
> which is R.A. +183.988 Decl. -2.354
> missing R.A. +186.061 Decl. -2.657 (ibex-sun)
> error is R.A. +2.073 Decl. +0.303
> for a total 2.093 deg
>
> ibex_rotate -o -u -0.996737,-0.069489,-0.041073 -w ibex-sun -t 2013/10:04:11:32:44
> Quaternion +0.000000,+0.000000,+0.000000,+0.000000
> points axis +1.000000,+0.000000,+0.000000
> towards ECI -0.996737,-0.069489,-0.041073
> which is R.A. +183.988 Decl. -2.354
> missing R.A. +190.342 Decl. -4.445 (ibex-sun)
> error is R.A. +6.354 Decl. +2.091
> for a total 6.678 deg
>
> The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 222 apogee:
>
> ibex_rotate -o -u -0.986774,-0.144482,-0.073499 -w ibex-sun -t 2013/10:04:13:44:25
> Quaternion +0.000000,+0.000000,+0.000000,+0.000000
> points axis +1.000000,+0.000000,+0.000000
> towards ECI -0.986774,-0.144482,-0.073499
> which is R.A. +188.330 Decl. -4.215
> missing R.A. +190.426 Decl. -4.479 (ibex-sun)
> error is R.A. +2.096 Decl. +0.264
> for a total 2.107 deg
>
> ibex_rotate -o -u -0.986774,-0.144482,-0.073499 -w ibex-sun -t 2013-10-09T14:05:27.138Z
> Quaternion +0.000000,+0.000000,+0.000000,+0.000000
> points axis +1.000000,+0.000000,+0.000000
> towards ECI -0.986774,-0.144482,-0.073499
> which is R.A. +188.330 Decl. -4.215
> missing R.A. +194.884 Decl. -6.389 (ibex-sun)
> error is R.A. +6.554 Decl. +2.174
> for a total 6.878 deg
>
> No Lo O-mode.
>
> There is no overlap with orbit 220 commands by manual inspection or by checking at
>
> http://ibex.unh.edu/cgi-bin/ats.cgi.
>
> Command Approval Checklist is attached.
>
> Ken
>
> From: "Ibex Mission Operations" <ibexops at gmail.com>
> To: "IBEX-FDG" <IBEX.fdg at applieddefense.com>, "IBEXOPS/ORB" <IBEXops at orbital.com>, "ISOC at New Hampshire" <isocops at lists.sr.unh.edu>, "John Cavallo" <cavallo.john at orbital.com>, "Ken Fairchild" <fair-play at comcast.net>, "Mark Tapley" <mtapley at swri.edu>, "Nigel Angold" <ngangold at earthlink.net>, "Robert Lockwood" <Lockwood.Robert at Orbital.com>, "Roland Vanderspek" <roland at space.mit.edu>, "Ryan Tyler" <tyler.ryan at orbital.com>, "Sheral Wesley" <wesley.sheral at orbital.com>, "Thomas Regiec" <regiec.thomas at orbital.com>, "Tim Perry" <perry.tim at orbital.com>
> Sent: Thursday, September 12, 2013 7:56:13 AM
> Subject: IBEX Orbit# 221 ATS (25 Sept 13 - 4 Oct 13)
>
> Guys,
> Here are the planning files and ATS for Orbit# 221.
> Please respond to this email thread with any questions or comments.
> All questions, comments and approvals are required before 14 Sept 13 @1400 UTC
>
> Note the following
> 1. Battery balancing at PERIGEE
> 2. Moon in Lo FOV
> 2013-09-26T09:27:57.772Z,MoonInLoFovStart,orbit:221
> 2013-09-27T06:55:41.129Z,MoonInLoFovStop,orbit:221
> 3. Command Load Constraint Violation Report (CCVR)
> IBEX_2013_268_o0221a_v001.scr
> ==========================
> HARD CONSTRAINT VIOLATIONS
> ==========================
> NO VIOLATIONS.
> ==========================
> SOFT CONSTRAINT VIOLATIONS
> ==========================
> NO VIOLATIONS.
> ==============
> OTHER MESSAGES
> ==============
> NO MESSAGES.
>
> --
> Sheral R. Wesley
> SPVR., Satellite Operations
> IBEX Mission OPS
> (304) 279-6678
> <IBEX-Command-Approval-Checklist-Rev12a-o0221_KWF.doc>
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