[Isocops] IBEX Orbit#416 ATS Approval (5 Aug - 14 Aug) - v001 approval

Ken Fairchild fair-play at comcast.net
Wed Jul 25 01:36:59 EDT 2018


All,


I have looked at the orbit 416 ATS,


IBEX_2018_217_o0416a_v001.scr,


and I approve.


The only constraint violations in


IBEX_2018_217_o0416a_v001_.ccvr


are from 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_217_o0416a_v002.stf.


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_217_o0416a_v001.oef,


and as verified with ibex_orbit.


There is one star tracker outage.  The outage starts just before perigee and runs for 7 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 the same as that in the OEF and the ATS end time is 2+ hours after that in the OEF.  Differences in timing are not unusual.


Th ground station command sequences are correct and the timing and bit rates match those in the contacts file,


IBEX_Orbit416_Contacts.txt,


for all contacts (3).


We are not doing battery cell balancing this orbit; we'll do it again in the next orbit.


The inertial maneuver at perigee of orbit 415 left us pointing in safe directions for the orbit 416 arc A ascending and descending sequences:


ibex_rotate -o -u -0.646303,0.703736,0.295041 -w ibex-sun -t 2018/08:05:17:45:09

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.646303,+0.703736,+0.295041

which is R.A. +132.564 Decl. +17.160

missing R.A. +135.440 Decl. +16.895 (ibex-sun)

error is R.A. +2.876 Decl. +0.265

for a total 2.763 deg


ibex_rotate -o -u -0.646303,0.703736,0.295041 -w ibex-sun -t 2018/08:09:10:44:57

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.646303,+0.703736,+0.295041

which is R.A. +132.564 Decl. +17.160

missing R.A. +138.950 Decl. +15.876 (ibex-sun)

error is R.A. +6.386 Decl. +1.284

for a total 6.256 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 -0.702814,0.656693,0.273506 -w ibex-sun -t 2018/08:09:12:28:05

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.702814,+0.656693,+0.273506

which is R.A. +136.943 Decl. +15.873

missing R.A. +139.020 Decl. +15.856 (ibex-sun)

error is R.A. +2.077 Decl. +0.017

for a total 1.998 deg


ibex_rotate -o -u -0.702814,0.656693,0.273506 -w ibex-sun -t 2018/08:09:14:03:11

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.702814,+0.656693,+0.273506

which is R.A. +136.943 Decl. +15.873

missing R.A. +139.084 Decl. +15.837 (ibex-sun)

error is R.A. +2.141 Decl. +0.036

for a total 2.060 deg


ibex_rotate -o -u -0.702814,0.656693,0.273506 -w ibex-sun -t 2018/08:14:03:26:12

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.702814,+0.656693,+0.273506

which is R.A. +136.943 Decl. +15.873

missing R.A. +143.488 Decl. +14.488 (ibex-sun)

error is R.A. +6.545 Decl. +1.385

for a total 6.466 deg


The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 417 apogee:


ibex_rotate -o -u -0.757047,0.603046,0.251427 -w ibex-sun -t 2018/08:14:06:01:41

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.757047,+0.603046,+0.251427

which is R.A. +141.460 Decl. +14.562

missing R.A. +143.587 Decl. +14.452 (ibex-sun)

error is R.A. +2.127 Decl. +0.110

for a total 2.062 deg


ibex_rotate -o -u -0.757047,0.603046,0.251427 -w ibex-sun -t 2018-08-19T04:18:02.048Z

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.757047,+0.603046,+0.251427

which is R.A. +141.460 Decl. +14.562

missing R.A. +148.092 Decl. +12.899 (ibex-sun)

error is R.A. +6.632 Decl. +1.663

for a total 6.653 deg


No Lo O-mode.


There is no overlap with orbit 415 commands by manual inspection or by checking at


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


Command Approval Checklist is attached.


Ken



> On July 24, 2018 at 10:05 AM "Perry, Timothy" <Timothy.Perry at OrbitalATK.com> wrote:
> 
> 
>     All,
> 
>       Attached are the planning files for Orbit#416.
> 
>     Please respond to this thread with comments and approvals.
> 
>     Approvals are required before 25 July 18 @22:00 GMT
> 
>     Note the following:
> 
>     1.    No battery balancing
> 
>      
> 
>     2.    Moon in Lo FOV
> 
>     2018-08-05T19:27:00.764Z,MoonInLoFovStart,orbit:416
> 
>     2018-08-05T20:50:30.826Z,MoonInLoFovStop,orbit:416
> 
>      
> 
>     3.    Command Load Constraint Violation Report
> 
>     # Input files:         1
> 
>     #   IBEX_2018_217_o0416a_v001.scr
> 
>      
> 
>     ==========================
> 
>     HARD CONSTRAINT VIOLATIONS
> 
>     ==========================
> 
>     NO VIOLATIONS.
> 
>      
> 
>     ==========================
> 
>     SOFT CONSTRAINT VIOLATIONS
> 
>     ==========================
> 
>     IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                  transition to science mode at 2018/08/05 15:58:40 UTC
> 
>     IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                  transition to science mode at 2018/08/09 13:33:11 UTC
> 
>      
> 
>     ==============
> 
>     OTHER MESSAGES
> 
>     ==============
> 
>     NO MESSAGES.
> 
>      
> 
>      
> 
>     Timothy E. Perry
> 
>     CRS, IBEX, OCO-2 & TESS
> 
>     Mission Operations
> 
>     Tim.perry at ngc.com mailto:Tim.perry at ngc.com
> 
>     Office (703) 406-5976
> 
>     Cell (301) 606-1430
> 
>     Corp Cell (571) 447-8977
> 
>      
> 
>      
> 
> 
> 
>     ---------------------------------------------
>     Notice: This e-mail is intended solely for use of the individual or entity to which it is addressed and may contain information that is proprietary, privileged and/or exempt from disclosure under applicable law. If the reader is not the intended recipient or agent responsible for delivering the message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. This communication may also contain data subject to U.S. export laws. If so, data subject to the International Traffic in Arms Regulation cannot be disseminated, distributed, transferred, or copied, whether incorporated or in its original form, to foreign nationals residing in the U.S. or abroad, absent the express prior approval of the U.S. Department of State. Data subject to the Export Administration Act may not be disseminated, distributed, transferred or copied contrary to U. S. Department of Commerce regulations. If you have received this communication in error, please notify the sender by reply e-mail and destroy the e-mail message and any physical copies made of the communication.
>      Thank you. 
>     *********************
> 
 
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