[Isocops] IBEX Orbit #466 ATS Approval ( 1 - 10 Nov 2019 ) - v001 approval

KEN FAIRCHILD fair-play at comcast.net
Mon Oct 21 16:16:45 EDT 2019 

All,


Note: Angle at orbit 466 arc B descending after the apogee sun precession maneuver: 4.289 deg


I have looked at the orbit 466 ATS,


IBEX_2019_305_o0466a_v001.scr,


and I approve.


The only constraint violations in


IBEX_2019_305_o0466a_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_305_o0466a_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_305_o0466a_v001.oef,


and as verified with ibex_orbit.


There are two star tracker outages.  The first starts about 10 hours before apogee and ends just after apogee.  The second starts about 1.5 days after apogee and runs for about 5 1/2 hours.  Some despinning may be required due to these outages.


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


IBEX_Orbit466_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 precession maneuver at perigee of orbit 465 left us pointing in safe directions for the orbit 466 arc A ascending and descending sequences:


ibex_rotate -o -u -0.811712,-0.532222,-0.24055 -w ibex-sun -t 2019/11:01:15:06:26

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.811712,-0.532222,-0.240550

which is R.A. +213.252 Decl. -13.919

missing R.A. +216.269 Decl. -14.405 (ibex-sun)

error is R.A. +3.017 Decl. +0.486

for a total 2.966 deg


ibex_rotate -o -u -0.811712,-0.532222,-0.24055 -w ibex-sun -t 2019/11:05:16:55:37

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.811712,-0.532222,-0.240550

which is R.A. +213.252 Decl. -13.919

missing R.A. +220.170 Decl. -15.619 (ibex-sun)

error is R.A. +6.918 Decl. +1.700

for a total 6.902 deg


The sun 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 -r +220.244 -d -15.641 -w ibex-sun -t 2019/11:05:18:43:45

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.735035,-0.622121,-0.269609

which is R.A. +220.244 Decl. -15.641

missing R.A. +220.244 Decl. -15.641 (ibex-sun)

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

for a total 0.000 deg


ibex_rotate -o -r +220.244 -d -15.641 -w ibex-sun -t 2019/11:05:20:13:51

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.735035,-0.622121,-0.269609

which is R.A. +220.244 Decl. -15.641

missing R.A. +220.306 Decl. -15.658 (ibex-sun)

error is R.A. +0.062 Decl. +0.017

for a total 0.062 deg


ibex_rotate -o -r +220.244 -d -15.641 -w ibex-sun -t 2019/11:09:22:56:12

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.735035,-0.622121,-0.269609

which is R.A. +220.244 Decl. -15.641

missing R.A. +224.519 Decl. -16.888 (ibex-sun)

error is R.A. +4.275 Decl. +1.247

for a total 4.289 deg


The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 467 apogee:


ibex_rotate -o -u -0.70876,-0.643612,-0.288831 -w ibex-sun -t 2019/11:10:02:34:51

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.708760,-0.643612,-0.288831

which is R.A. +222.242 Decl. -16.788

missing R.A. +224.679 Decl. -16.941 (ibex-sun)

error is R.A. +2.437 Decl. +0.153

for a total 2.337 deg


ibex_rotate -o -u -0.70876,-0.643612,-0.288831 -w ibex-sun -t 2019-11-15T00:09:08.062Z

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.708760,-0.643612,-0.288831

which is R.A. +222.242 Decl. -16.788

missing R.A. +229.552 Decl. -18.252 (ibex-sun)

error is R.A. +7.310 Decl. +1.464

for a total 7.122 deg


No Lo O-mode.


There is no overlap with orbit 465 commands by manual inspection or by checking at


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


Command Approval Checklist is attached.


Ken


> On October 17, 2019 at 9:12 PM "Perry, Timothy E [US] (IS)" <Timothy.Perry at ngc.com> wrote:
> 
> 
>     All,
> 
>        Attached are the planning files for Orbit #466
> 
>     Please respond to this thread with comments and approvals.  
> 
>     Approvals are required by COB on 21 Oct 2019
> 
>      
> 
>     Please note the following:
> 
>     1.       Battery Balancing
> 
>      
> 
>     2.       1 Sun Maneuver ( Apogee) and 1 Inertial maneuver (Perigee)
> 
>      
> 
>     3.       Command Load Constraint Violation Report (CCVR)
> 
>         #   IBEX_2019_305_o0466a_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 2019/11/01 12:34:04 UTC
> 
>         IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                      transition to science mode at 2019/11/05 19:43:51 UTC
> 
>          
> 
>         ==============
> 
>         OTHER MESSAGES
> 
>         ==============
> 
>         NO MESSAGES.
> 
>          
> 
>      
> 
>      
> 
>      
> 
>      
> 
>     Timothy E.Perry
> 
>     CRS IBEX OCO-2
> 
>     Mission Operations
> 
>     timothy.perry at ngc.com
> 
>     Office (703) 406-5976
> 
>     Cell (301) 606-1430
> 
>      
> 
>     [cid:image001.png at 01D542D6.6047A400]
> 
>      
> 
>      
> 


 
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