[Isocops] IBEX Orbit #568 ATS Approval (18 – 26 May 2022) - v001 approval

[KEN FAIRCHILD]

All,

I have looked at the orbit 568 ATS,

IBEX_2022_138_o0568a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2022_138_o0568a_v001.ccvr

are from the removal of the

ACT_SetSpinPulseProtectEnable Enable

commands (2); the violations are expected.

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_2022_138_o0568a_v001.oef,

and as verified with ibex_orbit.

There is one star tracker outage.  The outage starts 5 hours after 15 Re descending and runs for 8+ hours.  No despinning should 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_Orbit568_Contacts.txt,

for all contacts (3).

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

The inertial precession maneuver at perigee of orbit 567 leaves us pointing in safe directions for the orbit 568 arc A ascending and descending sequences:

ibex_rotate -o -u 0.579312,0.75141,0.315881 -w ibex-sun -t 2022/05:18:13:13:19
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.579312,+0.751410,+0.315881
which is R.A. +52.369 Decl. +18.414
missing R.A. +54.974 Decl. +19.523 (ibex-sun)
error is R.A. +2.605 Decl. +1.109
for a total 2.702 deg

ibex_rotate -o -u 0.579312,0.75141,0.315881 -w ibex-sun -t 2022/05:22:01:07:38
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.579312,+0.751410,+0.315881
which is R.A. +52.369 Decl. +18.414
missing R.A. +58.511 Decl. +20.292 (ibex-sun)
error is R.A. +6.142 Decl. +1.878
for a total 6.091 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 0.518289,0.78857,0.330959 -w ibex-sun -t 2022/05:22:02:50:46
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.518289,+0.788570,+0.330959
which is R.A. +56.685 Decl. +19.327
missing R.A. +58.584 Decl. +20.307 (ibex-sun)
error is R.A. +1.899 Decl. +0.980
for a total 2.038 deg

ibex_rotate -o -u 0.518289,0.78857,0.330959 -w ibex-sun -t 2022/05:22:04:25:52
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.518289,+0.788570,+0.330959
which is R.A. +56.685 Decl. +19.327
missing R.A. +58.652 Decl. +20.322 (ibex-sun)
error is R.A. +1.967 Decl. +0.995
for a total 2.101 deg

ibex_rotate -o -u 0.518289,0.78857,0.330959 -w ibex-sun -t 2022/05:26:11:35:14
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.518289,+0.788570,+0.330959
which is R.A. +56.685 Decl. +19.327
missing R.A. +62.991 Decl. +21.135 (ibex-sun)
error is R.A. +6.306 Decl. +1.808
for a total 6.187 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 569 apogee:

ibex_rotate -o -u 0.452191,0.821888,0.346445 -w ibex-sun -t 2022/05:26:14:17:21
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.452191,+0.821888,+0.346445
which is R.A. +61.181 Decl. +20.270
missing R.A. +63.099 Decl. +21.149 (ibex-sun)
error is R.A. +1.918 Decl. +0.879
for a total 1.998 deg

ibex_rotate -o -u 0.452191,0.821888,0.346445 -w ibex-sun -t 2022-05-31T11:00:35.884Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.452191,+0.821888,+0.346445
which is R.A. +61.181 Decl. +20.270
missing R.A. +68.040 Decl. +21.914 (ibex-sun)
error is R.A. +6.859 Decl. +1.644
for a total 6.606 deg

Lo Normal mode for the entire orbit.

There is no overlap with orbit 567 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken


>     On 05/05/2022 10:34 AM Perry, Timothy E [US] (SP) <timothy.perry at ngc.com> wrote:
> 
> 
>                                         
>     All, 
>        Attached are the planning files for Orbit #568. Please respond to this thread with comments and approvals.   
>     Approvals are required by 1800, 08 May 2022 
>       
>     Please note the following: 
> 
>        1. No Battery Balancing this orbit 
>        2. 
>        3. Command Load Constraint Violation Report (CCVR) 
> 
>         > >             IBEX_2022_138_o0568a_v001.ccvr 
> >             # Input files:         1 
> >             #   IBEX_2022_138_o0568a_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 2022/05/18 11:14:27 UTC 
> >             IBX-CLC-016: No command to enable spin pulse protection was found after 
> >                          transition to science mode at 2022/05/22 03:55:52 UTC 
> > 
> >             ============== 
> >             OTHER MESSAGES 
> >             ============== 
> > 
> >     > 
>         > > 
> >             > > >                NO MESSAGES
> > > 
> > >         > > 
> >     > 
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