[Isocops] IBEX ORbit# 412 ATS Approval (29 Jun 18 - 8 Jul 18) - v001 approval

Ken Fairchild fair-play at comcast.net
Tue Jun 19 14:29:23 EDT 2018


All,


I have looked at the orbit 412 ATS,


IBEX_2018_180_o0412a_v001.scr,


and I approve.


The only constraint violations in


IBEX_2018_180_o0412a_v001_.ccvr


are from a long contact and the removal of the


ACT_SetSpinPulseProtectEnable Enable


commands (2); the violations are expected.


The PL commands in the v001 ATS match those in the v002 STF,


IBEX_2018_180_o0412a_v002.stf,


except the ATS has an SSR_DUMP_NEW command.  This is expected as APL is being used for the dump pass.


Ascending and descending command sequences are consistent with each other, 15 Re ascending, the apogee maneuver time and 15 Re descending as determined from the OEF,


IBEX_2018_180_o0412a_v001.oef,


and as verified with ibex_orbit.


There is one star tracker outage.  The outage starts about 4 hours before perigee and runs for about 7 1/2 hours.  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 6+ hours after that in the OEF and the ATS end time is about 3 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_Orbit412_Contacts.txt,


for all contacts (4).


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 411 left us pointing in safe directions for the orbit 412 arc A ascending and descending sequences:


ibex_rotate -o -u -0.087068,0.917661,0.387709 -w ibex-sun -t 2018/06:29:17:34:31

Quaternion    +0.000000,+0.000000,+0.000000,+0.000000

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.087068,+0.917661,+0.387709

 which is     R.A.  +95.420 Decl. +22.812

 missing      R.A.  +98.322 Decl. +23.194 (ibex-sun)

 error is     R.A.   +2.902 Decl.  +0.382

 for a total  2.699 deg


ibex_rotate -o -u -0.087068,0.917661,0.387709 -w ibex-sun -t 2018/07:03:09:02:30

Quaternion    +0.000000,+0.000000,+0.000000,+0.000000

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.087068,+0.917661,+0.387709

 which is     R.A.  +95.420 Decl. +22.812

 missing      R.A. +102.129 Decl. +22.950 (ibex-sun)

 error is     R.A.   +6.709 Decl.  +0.138

 for a total  6.182 deg


The inertial precession 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 -0.161561,0.909481,0.38307 -w ibex-sun -t 2018/07:03:10:45:38 

Quaternion    +0.000000,+0.000000,+0.000000,+0.000000

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.161561,+0.909481,+0.383070

 which is     R.A. +100.073 Decl. +22.524

 missing      R.A. +102.204 Decl. +22.945 (ibex-sun)

 error is     R.A.   +2.131 Decl.  +0.421

 for a total  2.010 deg


ibex_rotate -o -u -0.161561,0.909481,0.38307 -w ibex-sun -t 2018/07:03:12:20:44

Quaternion    +0.000000,+0.000000,+0.000000,+0.000000

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.161561,+0.909481,+0.383070

 which is     R.A. +100.073 Decl. +22.524

 missing      R.A. +102.274 Decl. +22.941 (ibex-sun)

 error is     R.A.   +2.201 Decl.  +0.417

 for a total  2.072 deg


ibex_rotate -o -u -0.161561,0.909481,0.38307 -w ibex-sun -t 2018/07:07:23:56:36

Quaternion    +0.000000,+0.000000,+0.000000,+0.000000

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.161561,+0.909481,+0.383070

 which is     R.A. +100.073 Decl. +22.524

 missing      R.A. +106.910 Decl. +22.551 (ibex-sun)

 error is     R.A.   +6.837 Decl.  +0.027

 for a total  6.315 deg


The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 413 apogee:


ibex_rotate -o -u -0.238011,0.894762,0.377825 -w ibex-sun -t 2018/07:08:02:32:12

Quaternion    +0.000000,+0.000000,+0.000000,+0.000000

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.238011,+0.894762,+0.377825

 which is     R.A. +104.896 Decl. +22.199

 missing      R.A. +107.015 Decl. +22.536 (ibex-sun)

 error is     R.A.   +2.119 Decl.  +0.337

 for a total  1.988 deg


ibex_rotate -o -u -0.238011,0.894762,0.377825 -w ibex-sun -t 2018-07-13T04:29:00.206Z

Quaternion    +0.000000,+0.000000,+0.000000,+0.000000

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.238011,+0.894762,+0.377825

 which is     R.A. +104.896 Decl. +22.199

 missing      R.A. +112.172 Decl. +21.863 (ibex-sun)

 error is     R.A.   +7.276 Decl.  +0.336

 for a total  6.752 deg


No Lo O-mode.


There is no overlap with orbit 411 commands by manual inspection or by checking at


http://ibex.unh.edu/cgi-bin/ats.cgi.


Command Approval Checklist is attached.


Ken



> On June 16, 2018 at 6:05 PM "Wesley, Sheral" <Sheral.Wesley at OrbitalATK.com> wrote:
> 
> 
>     Guys,
> 
>     Here are the planning files and ATS for Orbit# 412 .
> 
>     Please respond to this email thread with your comments and approvals
> 
>     Approvals are required before 19 Jun 18 @1000 UTC
> 
>      
> 
>     Note the following:
> 
>     1.       APL-18 SSR_Dump Contact
> 
>     IBEX,APL-18,ADD,07/08/18,189,13:00:00,07/08/18,189,14:00:00,,11re-Ascending Perigee 2K-320K IBEX Orbit# 412 SSR_Dump
> 
>      
> 
>     2.       Battery Balancing
> 
>     #  Orbit# 412 PERIGEE Battery Balancing
> 
>     # 2018-07-08T11:17:20.139Z,Perigee,orbit:412
> 
>     SetLongEclipseFlag TRUE $TIME=2018/07:08:08:30:00
> 
>     SetLongEclipseFlag FALSE $TIME=2018/07:08:10:00:00
> 
>      
> 
>     3.       Moon in Lo FOV Commands
> 
>     #  2018-07-01T22:06:12.982Z,MoonInLoFovStart,orbit:412
> 
>     #  2018-07-02T18:27:02.000Z,MoonInLoFovStop,orbit:412
> 
>      
> 
>     4.       Orbit# 411  IBEX_Hi Background/Magneto Tail Contact
> 
>     IBEX,USAK01,ADD,06/29/18,180,18:30:00,06/29/18,180,20:00:00,,LAHO 40K IBEX-2 Hi-Background/Magneto Tail Table Uploads 
> 
>      
> 
>     5.       Command Load Constraint Violation Report
> 
>     IBEX_2018_180_o0412a_v001.scr
> 
>      
> 
>     ==========================
> 
>     HARD CONSTRAINT VIOLATIONS
> 
>     ==========================
> 
>     NO VIOLATIONS.
> 
>      
> 
>     ==========================
> 
>     SOFT CONSTRAINT VIOLATIONS
> 
>     ==========================
> 
>     IBX-CLC-006: Planned transmission at 2018/06/29 18:28:00 UTC - 2018/06/29
> 
>                  20:02:00 UTC exceeds the maximum contiguous transmission time of
> 
>                  5400 seconds
> 
>     ** IBEX,USAK01,ADD,06/29/18,180,18:30:00,06/29/18,180,20:00:00,,LAHO 40K IBEX-2 Hi-Background/Magneto Tail Table Uploads** 
> 
>      
> 
>     IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                  transition to science mode at 2018/06/29 15:51:42 UTC
> 
>     IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                  transition to science mode at 2018/07/03 11:50:44 UTC
> 
>      
> 
>     ==============
> 
>     OTHER MESSAGES
> 
>     ==============
> 
>     NO MESSAGES.
> 
>      
> 
>      
> 
>      
> 
>      
> 
>     Sheral  R. Wesley
> 
>     Sr Systems Engineer
> 
>     IBEX , OCO2 Mission OPS
> 
>     CRS/CYGNUS Mission Planning
> 
>     Northrop Grumman Innovation Systems
> 
>     Bldg. 2   Room 1337
> 
>     Office (703) 406-5641
> 
>     Cell (202) 236-0802
> 
>      
> 
>      
> 
>      
> 
> 
> 
>     ---------------------------------------------
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>     *********************
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