[Isocops] IBEX Orbit #464 ATS Approval ( 14 - 23 Oct 2019 ) Pt2 - v002

KEN FAIRCHILD fair-play at comcast.net
Thu Oct 17 13:03:10 EDT 2019 

All,


Note: Angle at orbit 464 arc B descending after the apogee sun precession maneuver: 4.241 deg

Note: Angle at orbit 465 apogee after the perigee sun precession maneuver: 4.639 deg


I have looked at the orbit 464 ATS,


IBEX_2019_287_o0464a_v002.scr,


and I approve.


The only constraint violations in


IBEX_2019_287_o0464a_v002.ccvr


are from the removal of the


ACT_SetSpinPulseProtectEnable Enable


commands (2); the violations are expected.


The PL commands in the v002 ATS match those in the v004 STF,


IBEX_2019_287_o0464a_v004.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_287_o0464a_v003.oef,


and as verified with ibex_orbit.


There are no star tracker outages.


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


IBEX_Orbit464_Contacts_v2.txt,


for all contacts (3).  The contact to check the star tracker is a blind acq.


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


The sun precession maneuver at perigee of orbit 463 left us pointing in safe directions for the orbit 464 arc A ascending and descending sequences (ascending sequence commented out):


ibex_rotate -o -r +198.401 -d -7.780 -w ibex-sun -t 2019/10:14:10:53:35

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.940136,-0.312760,-0.135370

which is R.A. +198.401 Decl. -7.780

missing R.A. +198.982 Decl. -8.047 (ibex-sun)

error is R.A. +0.581 Decl. +0.267

for a total 0.634 deg


ibex_rotate -o -r +198.401 -d -7.780 -w ibex-sun -t 2019/10:18:14:01:40

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.940136,-0.312760,-0.135370

which is R.A. +198.401 Decl. -7.780

missing R.A. +202.713 Decl. -9.498 (ibex-sun)

error is R.A. +4.312 Decl. +1.718

for a total 4.596 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 +202.783 -d -9.524 -w ibex-sun -t 2019/10:18:15:49:48

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.909270,-0.381904,-0.165461

which is R.A. +202.783 Decl. -9.524

missing R.A. +202.783 Decl. -9.524 (ibex-sun)

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

for a total 0.000 deg


ibex_rotate -o -r +202.783 -d -9.524 -w ibex-sun -t 2019/10:18:17:19:54

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.909270,-0.381904,-0.165461

which is R.A. +202.783 Decl. -9.524

missing R.A. +202.842 Decl. -9.546 (ibex-sun)

error is R.A. +0.059 Decl. +0.022

for a total 0.062 deg


ibex_rotate -o -r +202.783 -d -9.524 -w ibex-sun -t 2019/10:22:19:19:49

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.909270,-0.381904,-0.165461

which is R.A. +202.783 Decl. -9.524

missing R.A. +206.808 Decl.  -11.043 (ibex-sun)

error is R.A. +4.025 Decl. +1.519

for a total 4.241 deg


The sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 465 apogee:


ibex_rotate -o -r +206.945 -d -11.100 -w ibex-sun -t 2019/10:22:22:40:20

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.874765,-0.444658,-0.192522

which is R.A. +206.945 Decl. -11.100

missing R.A. +206.945 Decl. -11.100 (ibex-sun)

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

for a total 0.000 deg


ibex_rotate -o -r +206.945 -d -11.100 -w ibex-sun -t 2019-10-27T17:19:55.986Z

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.874765,-0.444658,-0.192522

which is R.A. +206.945 Decl. -11.100

missing R.A. +211.388 Decl. -12.717 (ibex-sun)

error is R.A. +4.443 Decl. +1.617

for a total 4.639 deg


No Lo O-mode.


There is no overlap with orbit 463 commands by manual inspection or by checking at


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


Command Approval Checklist is attached.


Ken

> On October 16, 2019 at 7:39 PM "Perry, Timothy E [US] (IS)" <Timothy.Perry at ngc.com> wrote:
> 
> 
>     All,
> 
>        Attached are the planning files for Orbit #464 Version 2
> 
>     Please respond to this thread with comments and approvals.  
> 
>      
> 
>     Please note the following:
> 
>     1.       No Battery balancing
> 
>     2.       2 Sun Maneuvers
> 
>     3.       Apogee contact has moved from 10/18/19,291,06:00:00 to 10/18/19,291,23:30:00
> 
>     4.       A contact has been scheduled to look at the star tracker “IBEX,USHI02,ADD,10/17/19,290,22:50:00,10/18/19,291,00:20:00,LAHO 2K IBEX-2 Orbit# 464 Apogee star tracker Contact”
> 
>     5.       ATS commands start at the descending commands @2019/10:18:13:38:50
> 
>     6.       Command Load Constraint Violation Report (CCVR)
> 
>     # Input files:         1
> 
>     #   IBEX_2019_287_o0464a_v002.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 2019/10/14 08:07:55 UTC
> 
>     IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                  transition to science mode at 2019/10/18 16:49:54 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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