[Isocops] IBEX Orbit #565 ATS Approval (21 - 30 Apr 2022) - v001 approval

Mon Apr 11 08:45:01 EDT 2022

All,

I have looked at the orbit 565 ATS,

IBEX_2022_111_o0565a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2022_111_o0565a_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_111_o0565a_v001.oef,

and as verified with ibex_orbit.

There is one star tracker outage.  The outage starts at 15 Re descending and runs for about 8 hours.  It is unlikely that any despinning will 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_Orbit565_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 564 leaves us pointing in safe directions for the orbit 565 arc A ascending and descending sequences:

ibex_rotate -o -u 0.878648,0.441587,0.181601 -w ibex-sun -t 2022/04:21:15:06:38
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.878648,+0.441587,+0.181601
which is R.A. +26.683 Decl. +10.463
missing R.A. +29.026 Decl. +11.857 (ibex-sun)
error is R.A. +2.343 Decl. +1.394
for a total 2.688 deg

ibex_rotate -o -u 0.878648,0.441587,0.181601 -w ibex-sun -t 2022/04:25:04:47:06
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.878648,+0.441587,+0.181601
which is R.A. +26.683 Decl. +10.463
missing R.A. +32.457 Decl. +13.100 (ibex-sun)
error is R.A. +5.774 Decl. +2.637
for a total 6.236 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 0.84042,0.50113,0.206307 -w ibex-sun -t 2022/04:25:06:30:14
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.840420,+0.501130,+0.206307
which is R.A. +30.807 Decl. +11.906
missing R.A. +32.525 Decl. +13.124 (ibex-sun)
error is R.A. +1.718 Decl. +1.218
for a total 2.073 deg

ibex_rotate -o -u 0.84042,0.50113,0.206307 -w ibex-sun -t 2022/04:25:08:05:20
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.840420,+0.501130,+0.206307
which is R.A. +30.807 Decl. +11.906
missing R.A. +32.588 Decl. +13.147 (ibex-sun)
error is R.A. +1.781 Decl. +1.241
for a total 2.136 deg

ibex_rotate -o -u 0.84042,0.50113,0.206307 -w ibex-sun -t 2022/04:29:16:20:48
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.840420,+0.501130,+0.206307
which is R.A.+30.807 Decl. +11.906
missing R.A. +36.650 Decl. +14.525 (ibex-sun)
error is R.A. +5.843 Decl. +2.619
for a total 6.261 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 566 apogee:

ibex_rotate -o -u 0.796375,0.558436,0.23224 -w ibex-sun -t 2022/04:30:01:43:36
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.796375,+0.558436,+0.232240
which is R.A. +35.039 Decl. +13.429
missing R.A. +37.001 Decl. +14.621 (ibex-sun)
error is R.A. +1.962 Decl. +1.192
for a total 2.246 deg

ibex_rotate -o -u 0.796375,0.558436,0.23224 -w ibex-sun -t 2022-05-04T16:03:28.834Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.796375,+0.558436,+0.232240
which is R.A. +35.039 Decl. +13.429
missing R.A. +41.469 Decl. +16.028 (ibex-sun)
error is R.A. +6.430 Decl. +2.599
for a total 6.739 deg

Lo Normal mode for the entire orbit.

There is no overlap with orbit 564 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken

>     On 04/08/2022 2:30 PM Perry, Timothy E [US] (SP) <timothy.perry at ngc.com> wrote:
> 
> 
> 
> 
>     All, 
>        Attached are the planning files for Orbit #565. Please respond to this thread with comments and approvals.   
>     Approvals are required by 1700, 11 April 2022 
>       
>     Please note the following:  
> 
>         > >            1. No Battery Balancing this orbit 
> >            2. 
> >            3. Command Load Constraint Violation Report (CCVR)
> >            4. IBEX_2022_111_o0565a_v001.ccvr 
> > 
> >     > 
>         > >             # Input files:         1 
> >             #   IBEX_2022_111_o0565a_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 2022/04/21 12:46:01 UTC 
> >             IBX-CLC-016: No command to enable spin pulse protection was found after 
> >                          transition to science mode at 2022/04/25 07:35:20 UTC 
> > 
> >             ============== 
> >             OTHER MESSAGES 
> >             ============== 
> >             NO MESSAGES.. 
> > 
> >     > 
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