[Isocops] IBEX Orbit #477 ATS Approval (11- 20 Feb 2020) - v001 approval

KEN FAIRCHILD fair-play at comcast.net
Thu Jan 30 22:25:46 EST 2020 

All,

I have looked at the orbit 477 ATS,

IBEX_2020_042_o0477a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2020_042_o0477a_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_042_o0477a_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_042_o0477a_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_Orbit477_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 476 left us pointing in safe directions for the orbit 477 arc A ascending and descending sequences:

ibex_rotate -o -u 0.795094,-0.552337,-0.250498 -w ibex-sun -t 2020/02:11:11:12:26
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.795094,-0.552337,-0.250498
which is R.A. +325.213 Decl. -14.507
missing R.A. +324.291 Decl. -14.221 (ibex-sun)
error is R.A. +0.922 Decl. +0.286
for a total 0.938 deg

ibex_rotate -o -u 0.795094,-0.552337,-0.250498 -w ibex-sun -t 2020/02:15:03:26:43
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.795094,-0.552337,-0.250498
which is R.A. +325.213 Decl. -14.507
missing R.A. +327.965 Decl. -12.947 (ibex-sun)
error is R.A. +2.752 Decl. +1.560
for a total 3.095 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 0.841256,-0.49232,-0.223403 -w ibex-sun -t 2020/02:15:05:09:51
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.841256,-0.492320,-0.223403
which is R.A. +329.663 Decl. -12.909
missing R.A. +328.034 Decl. -12.921 (ibex-sun)
error is R.A. +1.629 Decl. +0.012
for a total 1.588 deg

ibex_rotate -o -u 0.841256,-0.49232,-0.223403 -w ibex-sun -t 2020/02:15:06:44:57
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.841256,-0.492320,-0.223403
which is R.A. +329.663 Decl. -12.909
missing R.A. +328.097 Decl. -12.898 (ibex-sun)
error is R.A. +1.566 Decl. +0.011
for a total 1.526 deg

ibex_rotate -o -u 0.841256,-0.49232,-0.223403 -w ibex-sun -t 2020/02:19:17:59:58
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.841256,-0.492320,-0.223403
which is R.A. +329.663 Decl. -12.909
missing R.A. +332.314 Decl. -11.370 (ibex-sun)
error is R.A. +2.651 Decl. +1.539
for a total 3.014 deg

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 478 apogee:

ibex_rotate -o -u 0.881653,-0.428831,-0.196956 -w ibex-sun -t 2020/02:19:21:16:44
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. +332.449 Decl. -11.327 (ibex-sun)
error is R.A. +1.613 Decl. +0.032
for a total 1.582 deg

ibex_rotate -o -u 0.881653,-0.428831,-0.196956 -w ibex-sun -t 2020-02-24T16:12:16.224Z
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. +337.142 Decl.-9.548 (ibex-sun)
error is R.A. +3.080 Decl. +1.811
for a total 3.529 deg

No Lo O-mode.

There is no overlap with orbit 476 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken


> On January 28, 2020 at 1:31 PM "Perry, Timothy E [US] (IS)" <Timothy.Perry at ngc.com> wrote:
> 
> 
>     All,
> 
>        Attached are the planning files for Orbit #477
> 
>     Please respond to this thread with comments and approvals.  
> 
>     Approvals are required by COB on 31 Jan 2020
> 
>      
> 
>     Please note the following:
> 
>     1.       Battery Balancing:
> 
>         # Orbit 477 Battery Balancing
> 
>         # 2020-02-20T03:59:02.926Z,Perigee,orbit:477
> 
>           @ECT_SetLongEclipseFlag TRUE $TIME=2020/02:20:03:00:00
> 
>           @ECT_SetLongEclipseFlag FALSE $TIME=2020/02:20:04:30:00
> 
>          
> 
>     2.       Command Load Constraint Violation Report (CCVR)
> 
>     IBEX_2020_042_o0477a_v001_.ccvr
> 
>         # Input files:         1
> 
>         #   IBEX_2020_042_o0477a_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 2020/02/11 08:27:18 UTC
> 
>         IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                      transition to science mode at 2020/02/15 06:14:57 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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