[Isocops] IBEX Orbit #478 ATS Approval (20 - 29 Feb 2020) - v001 approval

Thu Feb 13 01:45:04 EST 2020

All,

I have looked at the orbit 478 ATS,

IBEX_2020_051_o0478a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2020_051_o0478a_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_2020_051_o0478a_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_2020_051_o0478a_v001.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_Orbit478_Contacts.txt,

for all contacts (4).

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

The inertial maneuver at perigee of orbit 477 left us pointing in safe directions for the orbit 478 arc A ascending and descending sequences:

ibex_rotate -o -u 0.881653,-0.428831,-0.196956 -w ibex-sun -t 2020/02:20:13:54:14
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.881653,-0.428831,-0.196956
which is R.A. +334.062 Decl. -11.359
missing R.A. +333.162 Decl. -11.096 (ibex-sun)
error is R.A. +0.900 Decl. +0.263
for a total 0.921 deg

ibex_rotate -o -u 0.881653,-0.428831,-0.196956 -w ibex-sun -t 2020/02:24:04:42:51
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.881653,-0.428831,-0.196956
which is R.A. +334.062 Decl. -11.359
missing R.A. +336.695 Decl.-9.729 (ibex-sun)
error is R.A. +2.633 Decl. +1.630
for a total 3.058 deg

The inertial 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 -u 0.916446,-0.363402,-0.167526 -w ibex-sun -t 2020/02:24:06:25:59
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.916446,-0.363402,-0.167526
which is R.A. +338.370 Decl.-9.644
missing R.A. +336.762 Decl.-9.702 (ibex-sun)
error is R.A. +1.608 Decl. +0.058
for a total 1.586 deg

ibex_rotate -o -u 0.916446,-0.363402,-0.167526 -w ibex-sun -t 2020/02:24:08:01:05
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.916446,-0.363402,-0.167526
which is R.A. +338.370 Decl.-9.644
missing R.A. +336.824 Decl.-9.677 (ibex-sun)
error is R.A. +1.546 Decl. +0.033
for a total 1.525 deg

ibex_rotate -o -u 0.916446,-0.363402,-0.167526 -w ibex-sun -t 2020/02:28:19:32:42
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.916446,-0.363402,-0.167526
which is R.A. +338.370 Decl.-9.644
missing R.A. +340.937 Decl.-8.042 (ibex-sun)
error is R.A. +2.567 Decl. +1.602
for a total 3.000 deg

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 479 apogee:

ibex_rotate -o -u 0.945157,-0.295488,-0.139156 -w ibex-sun -t 2020/02:28:23:05:12
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.945157,-0.295488,-0.139156
which is R.A. +342.639 Decl.-7.999
missing R.A. +341.078 Decl.-7.992 (ibex-sun)
error is R.A. +1.561 Decl. +0.007
for a total 1.546 deg

ibex_rotate -o -u 0.945157,-0.295488,-0.139156 -w ibex-sun -t 2020-03-04T19:17:47.322Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.945157,-0.295488,-0.139156
which is R.A. +342.639 Decl.-7.999
missing R.A. +345.725 Decl.-6.090 (ibex-sun)
error is R.A. +3.086 Decl. +1.909
for a total 3.609 deg

No Lo O-mode.

There is no overlap with orbit 477 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken

> On February 6, 2020 at 2:26 PM "Perry, Timothy E [US] (IS)" <Timothy.Perry at ngc.com> wrote:
> 
> 
>     All,
> 
>        Attached are the planning files for Orbit #478
> 
>     Please respond to this thread with comments and approvals.  
> 
>     Approvals are required by COB on 10 Feb 2020
> 
>      
> 
>     Please note the following:
> 
>     1.       No Battery Balancing
> 
>      
> 
>     2.       Command Load Constraint Violation Report (CCVR)
> 
>     IBEX_2020_051_o0478a_v001_.ccvr
> 
>         ==========================
> 
>         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 2020/02/20 11:23:48 UTC
> 
>         IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                      transition to science mode at 2020/02/24 07:31:05 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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