[Isocops] IBEX Orbit #451 ATS Approval ( 19 - 28 June 2019 ) - v001 approval

KEN FAIRCHILD fair-play at comcast.net
Sat Jun 8 03:58:12 EDT 2019


All,


I have looked at the orbit 451 ATS,


IBEX_2019_170_o0451a_v001.scr,


and I approve.


The only constraint violations in


IBEX_2019_170_o0451a_v001.ccvr


are from the removal of the


ACT_SetSpinPulseProtectEnable Enable


commands (2); the violations are expected.


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


IBEX_2019_170_o0451a_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_170_o0451a_v001.oef,


and as verified with ibex_orbit.


There is one star tracker outage.  The outage starts about 5 hours before perigee and runs for 8 hours.  No despinning should be required due to this outage.


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


IBEX_Orbit451_Contacts.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 450 left us pointing in safe directions for the orbit 451 arc A ascending and descending sequences:


ibex_rotate -o -u 0.082715,0.917934,0.388014 -w ibex-sun -t 2019/06:19:18:26:33

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.082715,+0.917934,+0.388014

which is R.A. +84.851 Decl. +22.831

missing R.A. +87.712 Decl. +23.397 (ibex-sun)

error is R.A. +2.861 Decl. +0.566

for a total 2.692 deg


ibex_rotate -o -u 0.082715,0.917934,0.388014 -w ibex-sun -t 2019/06:23:07:22:55

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.082715,+0.917934,+0.388014

which is R.A. +84.851 Decl. +22.831

missing R.A. +91.441 Decl. +23.424 (ibex-sun)

error is R.A. +6.590 Decl. +0.593

for a total 6.089 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 0.009441,0.921463,0.388352 -w ibex-sun -t 2019/06:23:09:06:03

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.009441,+0.921463,+0.388352

which is R.A. +89.413 Decl. +22.852

missing R.A. +91.517 Decl. +23.424 (ibex-sun)

error is R.A. +2.104 Decl. +0.572

for a total 2.018 deg


ibex_rotate -o -u 0.009441,0.921463,0.388352 -w ibex-sun -t 2019/06:23:10:41:09

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.009441,+0.921463,+0.388352

which is R.A. +89.413 Decl. +22.852

missing R.A. +91.587 Decl. +23.425 (ibex-sun)

error is R.A. +2.174 Decl. +0.573

for a total 2.080 deg


ibex_rotate -o -u 0.009441,0.921463,0.388352 -w ibex-sun -t 2019/06:27:19:26:15

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.009441,+0.921463,+0.388352

which is R.A. +89.413 Decl. +22.852

missing R.A. +96.131 Decl. +23.340 (ibex-sun)

error is R.A. +6.718 Decl. +0.488

for a total 6.198 deg


The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 452 apogee:


ibex_rotate -o -u -0.066571,0.919042,0.388497 -w ibex-sun -t 2019/06:27:22:05:06

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.066571,+0.919042,+0.388497

which is R.A. +94.143 Decl. +22.861

missing R.A. +96.238 Decl. +23.331 (ibex-sun)

error is R.A. +2.095 Decl. +0.470

for a total 1.984 deg


ibex_rotate -o -u -0.066571,0.919042,0.388497 -w ibex-sun -t 2019-07-02T20:43:17.934Z

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.066571,+0.919042,+0.388497

which is R.A. +94.143 Decl. +22.861

missing R.A. +101.344 Decl. +23.029 (ibex-sun)

error is R.A. +7.201 Decl. +0.168

for a total 6.633 deg


No Lo O-mode.


There is no overlap with orbit 450 commands by manual inspection or by checking at


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


Command Approval Checklist is attached.


Ken

> On June 5, 2019 at 3:47 PM "Perry, Timothy" <Timothy.Perry at ngc.com> wrote:
> 
> 
>     All,
> 
>        Attached are the planning files for Orbit #451
> 
>     Please respond to this thread with comments and approvals.
> 
>     Approvals are required by  COB 09 June 2019.
> 
> 
>     Please note the following:
> 
>     1.       Battery Balancing
> 
>     # Orbit 451 Battery Balancing   
> 
>     # 2019-06-28T06:43:21.527Z,Perigee,orbit:451 
> 
>       @ECT_SetLongEclipseFlag TRUE $TIME=2019/06:28:06:00:00
> 
>       @ECT_SetLongEclipseFlag FALSE $TIME=2019/06:28:07:30:00
> 
>      
> 
>     2.       IBEX_2019_170_o0451a_v001.ccvr
> 
>     # Input files:         1
> 
>     # IBEX_2019_170_o0451a_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 2019/06/19 16:36:27 UTC
> 
>     IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                  transition to science mode at 2019/06/23 10:11:09 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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