[Isocops] IBEX Orbit# 221 ATS (25 Sept 13 - 4 Oct 13) - v001 approval

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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