[Isocops] IBEX Orbit #453 ATS Approval ( 7 - 16 July 2019 ) - v001 approval

KEN FAIRCHILD fair-play at comcast.net
Fri Jun 28 10:43:52 EDT 2019


All,


Note: Angle at orbit 454 apogee after the perigee sun precession maneuver: 4.557 deg


I have looked at the orbit 453 ATS,


IBEX_2019_188_o0453a_v001.scr,


and I approve.


The only constraint violations in


IBEX_2019_188_o0453a_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_2019_188_o0453a_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_2019_188_o0453a_v001.oef,


and as verified with ibex_orbit.


There are two overlapping star tracker outages.  The first starts 3+ hours before 15 Re descending and the outages run for about a day.  Some despinning may be required due to the first outage.


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


IBEX_Orbit453_Contacts.txt,


for the four contacts in the ATS.  The APL contact commands will appear in a separate ATS.


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 452 left us pointing in safe directions for the orbit 453 arc A ascending and descending sequences:


ibex_rotate -o -u -0.217197,0.899157,0.379924 -w ibex-sun -t 2019/07:07:21:52:23

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.217197,+0.899157,+0.379924

which is R.A. +103.580 Decl. +22.329

missing R.A. +106.500 Decl. +22.547 (ibex-sun)

error is R.A. +2.920 Decl. +0.218

for a total 2.708 deg


ibex_rotate -o -u -0.217197,0.899157,0.379924 -w ibex-sun -t 2019/07:11:10:36:50

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.217197,+0.899157,+0.379924

which is R.A. +103.580 Decl. +22.329

missing R.A. +110.127 Decl. +22.144 (ibex-sun)

error is R.A. +6.547 Decl. +0.185

for a total 6.063 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 -0.287926,0.882632,0.371562 -w ibex-sun -t 2019/07:11:12:19:58

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.287926,+0.882632,+0.371562

which is R.A. +108.067 Decl. +21.812

missing R.A. +110.202 Decl. +22.135 (ibex-sun)

error is R.A. +2.135 Decl. +0.323

for a total 2.006 deg


ibex_rotate -o -u -0.287926,0.882632,0.371562 -w ibex-sun -t 2019/07:11:13:55:04

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.287926,+0.882632,+0.371562

which is R.A. +108.067 Decl. +21.812

missing R.A. +110.270 Decl. +22.127 (ibex-sun)

error is R.A. +2.203 Decl. +0.315

for a total 2.067 deg


ibex_rotate -o -u -0.287926,0.882632,0.371562 -w ibex-sun -t 2019/07:15:21:40:27

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.287926,+0.882632,+0.371562

which is R.A. +108.067 Decl. +21.812

missing R.A. +114.708 Decl. +21.519 (ibex-sun)

error is R.A. +6.641 Decl. +0.293

for a total 6.179 deg


The sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 454 apogee:


ibex_rotate -o -r +114.815 -d +21.497 -w ibex-sun -t 2019/07:16:00:19:45

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.390495,+0.844527,+0.366453

which is R.A. +114.815 Decl. +21.497

missing R.A. +114.815 Decl. +21.497 (ibex-sun)

error is R.A. +0.000 Decl. +0.000

for a total 0.001 deg


ibex_rotate -o -r +114.815 -d +21.497 -w ibex-sun -t 2019-07-20T20:12:43.777Z

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.390495,+0.844527,+0.366453

which is R.A. +114.815 Decl. +21.497

missing R.A. +119.614 Decl. +20.654 (ibex-sun)

error is R.A. +4.799 Decl. +0.843

for a total 4.557 deg


No Lo O-mode.


There is no overlap with orbit 452 commands by manual inspection or by checking at


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


Command Approval Checklist is attached.


Ken

> On June 24, 2019 at 3:28 PM "Perry, Timothy" <Timothy.Perry at ngc.com> wrote:
> 
> 
>     All,
> 
>        Attached are the planning files for Orbit #453
> 
>     Please respond to this thread with comments and approvals.
> 
>     Approvals are required by  COB 27 June 2019.
> 
> 
>     Please note the following:
> 
>     1.       Battery Balancing
> 
>     # Orbit 453 Battery Balancing 
> 
>     # 2019-07-16T09:11:45.035Z,Perigee,orbit:453 
> 
>       @ECT_SetLongEclipseFlag TRUE $TIME=2019/07:16:08:00:00
> 
>       @ECT_SetLongEclipseFlag FALSE $TIME=2019/07:16:09:30:00  
> 
>      
> 
>     2.       # IBEX, APL-18 07/16/19 11:15:00 - 12:15:00
> 
>     APL SSR Dump contact has been scheduled , but not confirmed yet.
> 
>     A separate ATS will be built wen the contact has been confirmed.
> 
>      
> 
>     3.       Command Load Constraint Violation Report (CCVR)
> 
>        IBEX_2019_188_o0453a_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 2019/07/07 20:01:17 UTC
> 
>     IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                  transition to science mode at 2019/07/11 13:25:04 UTC
> 
>      
> 
>     ==============
> 
>     OTHER MESSAGES
> 
>     ==============
> 
>     NO MESSAGES.
> 
>      
> 
>     Timothy E.Perry
> 
>     CRS IBEX OCO-2
> 
>     Mission Operations
> 
>     tim.perry at orbitalatk.com
> 
>     Office (703) 406-5976
> 
>     Cell (301) 606-1430
> 
>     [cid:image001.jpg at 01D04F4E.6B1BECE0]
> 
>      
> 
>      
> 
> 
> 
>     ---------------------------------------------
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>     *********************
> 


 
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