[Isocops] IBEX Orbit #444 ATS Approval ( 16 - 26 April 2019) - v001 approval

KEN FAIRCHILD fair-play at comcast.net
Fri Apr 5 10:57:29 EDT 2019 

All,


I have looked at the orbit 444 ATS,


IBEX_2019_106_o0444a_v001.scr,


and I approve.


The only constraint violations in


IBEX_2019_106_o0444a_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_106_o0444a_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_106_o0444a_v002.oef,


and as verified with ibex_orbit.


There is one star tracker outage. The outage starts 8 hours after apogee and runs for 2- days.  Some despinning may 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_Orbit444_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 443 left us pointing in safe directions for the orbit 444 arc A ascending and descending sequences:


ibex_rotate -o -u 0.915887,0.371828,0.151313 -w ibex-sun -t 2019/04:16:20:53:55

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.915887,+0.371828,+0.151313

which is R.A. +22.096 Decl. +8.703

missing R.A. +24.393 Decl. +10.130 (ibex-sun)

error is R.A. +2.297 Decl. +1.427

for a total 2.677 deg


ibex_rotate -o -u 0.915887,0.371828,0.151313 -w ibex-sun -t 2019/04:20:13:24:48

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.915887,+0.371828,+0.151313

which is R.A. +22.096 Decl. +8.703

missing R.A. +27.937 Decl. +11.472 (ibex-sun)

error is R.A. +5.841 Decl. +2.769

for a total 6.382 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 0.882057,0.436227,0.177995 -w ibex-sun -t 2019/04:20:15:07:56

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.882057,+0.436227,+0.177995

which is R.A. +26.315 Decl. +10.253

missing R.A. +28.004 Decl. +11.498 (ibex-sun)

error is R.A. +1.689 Decl. +1.245

for a total 2.074 deg


ibex_rotate -o -u 0.882057,0.436227,0.177995 -w ibex-sun -t 2019/04:20:16:43:02

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.882057,+0.436227,+0.177995

which is R.A. +26.315 Decl. +10.253

missing R.A. +28.066 Decl. +11.522 (ibex-sun)

error is R.A. +1.751 Decl. +1.269

for a total 2.137 deg


ibex_rotate -o -u 0.882057,0.436227,0.177995 -w ibex-sun -t 2019/04:25:03:35:23

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.882057,+0.436227,+0.177995

which is R.A. +26.315 Decl. +10.253

missing R.A. +32.120 Decl. +13.001 (ibex-sun)

error is R.A. +5.805 Decl. +2.748

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 445 apogee:


ibex_rotate -o -u 0.842741,0.497443,0.20576 -w ibex-sun -t 2019/04:25:06:41:41

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.842741,+0.497443,+0.205760

which is R.A. +30.552 Decl. +11.874

missing R.A. +32.237 Decl. +13.036 (ibex-sun)

error is R.A. +1.685 Decl. +1.162

for a total 2.014 deg


ibex_rotate -o -u 0.842741,0.497443,0.20576 -w ibex-sun -t 2019-04-30T03:01:17.328Z

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

points axis +1.000 000,+0.000000,+0.000000

towards ECI +0.842741,+0.497443,+0.205760

which is R.A. +30.552 Decl. +11.874

missing R.A. +36.943 Decl. +14.602 (ibex-sun)

error is R.A. +6.391 Decl. +2.728

for a total 6.793 deg


No Lo O-mode.


There is no overlap with orbit 443 commands by manual inspection or by checking at


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


Command Approval Checklist is attached.


Ken



> On April 4, 2019 at 1:54 PM "Perry, Timothy" <Timothy.Perry at ngc.com> wrote:
> 
> 
>     All,
> 
>        Attached are the planning files for Orbit #444.
> 
>     Please respond to this thread with comments and approvals.
> 
>     Approvals are required by 1500z 6 April 2019.
> 
>      
> 
>     Please Note the following:
> 
>     1.       Battery Balancing
> 
>     # Orbit 444 Battery Balancing   
> 
>     # 2019-04-25T13:49:35.760Z,Perigee,orbit:444
> 
>       @ECT_SetLongEclipseFlag TRUE $TIME=2019/04:25:13:00:00
> 
>       @ECT_SetLongEclipseFlag FALSE $TIME=2019/04:25:14:30:00
> 
>      
> 
>     2.       IBEX_2019_106_o0444a_v001.ccvr
> 
>     # Input files:         1
> 
>     #   IBEX_2019_106_o0444a_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 2019/04/16 18:14:02 UTC
> 
>     IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                  transition to science mode at 2019/04/20 16:13:02 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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