[Isocops] IBEX Orbit #566 ATS Approval (30 April – 09 May 2022) - v001 approval

Tue Apr 19 00:17:13 EDT 2022

All,

I have looked at the orbit 566 ATS,

IBEX_2022_120_o0566a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2022_120_o0566a_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_120_o0566a_v001.oef,

and as verified with ibex_orbit.

There is one star tracker outage.  The outage starts an hour after 15 Re descending and runs for almost 9 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_Orbit566_Contacts.txt,

for all contacts (3).

We are doing battery cell balancing and the balancing commands are correct and offset by enough time from other commands.

The inertial precession maneuver at perigee of orbit 565 leaves us pointing in safe directions for the orbit 566 arc A ascending and descending sequences:

ibex_rotate -o -u 0.796375,0.558436,0.23224 -w ibex-sun -t 2022/04:30:13:33:54
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. +37.459 Decl. +14.749 (ibex-sun)
error is R.A. +2.420 Decl. +1.320
for a total 2.693 deg

ibex_rotate -o -u 0.796375,0.558436,0.23224 -w ibex-sun -t 2022/05:04:04:34:31
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. +41.002 Decl. +15.881 (ibex-sun)
error is R.A. +5.963 Decl. +2.452
for a total 6.268 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 0.74835,0.612495,0.254602 -w ibex-sun -t 2022/05:04:06:17:39
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.748350,+0.612495,+0.254602
which is R.A. +39.299 Decl. +14.750
missing R.A. +41.072 Decl. +15.903 (ibex-sun)
error is R.A. +1.773 Decl. +1.153
for a total 2.062 deg

ibex_rotate -o -u 0.74835,0.612495,0.254602 -w ibex-sun -t 2022/05:04:07:52:45
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.748350,+0.612495,+0.254602
which is R.A. +39.299 Decl. +14.750
missing R.A. +41.136 Decl. +15.923 (ibex-sun)
error is R.A. +1.837 Decl. +1.173
for a total 2.125 deg

ibex_rotate -o -u 0.74835,0.612495,0.254602 -w ibex-sun -t 2022/05:08:17:55:55
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.748350,+0.612495,+0.254602
which is R.A. +39.299 Decl. +14.750
missing R.A. +45.374 Decl. +17.163 (ibex-sun)
error is R.A. +6.075 Decl. +2.413
for a total 6.319 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 567 apogee:

ibex_rotate -o -u 0.694466,0.663692,0.277902 -w ibex-sun -t 2022/05:09:04:39:50
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.694466,+0.663692,+0.277902
which is R.A. +43.702 Decl. +16.135
missing R.A. +45.784 Decl. +17.256 (ibex-sun)
error is R.A. +2.082 Decl. +1.121
for a total 2.287 deg

ibex_rotate -o -u 0.694466,0.663692,0.277902 -w ibex-sun -t 2022-05-13T15:52:29.417Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.694466,+0.663692,+0.277902
which is R.A. +43.702 Decl. +16.135
missing R.A. +50.205 Decl. +18.433 (ibex-sun)
error is R.A. +6.503 Decl. +2.298
for a total 6.620 deg

Lo Normal mode for the entire orbit.

There is no overlap with orbit 565 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken

>     On 04/17/2022 10:18 AM Perry, Timothy E [US] (SP) <timothy.perry at ngc.com> wrote:
> 
> 
>     All, 
>        Attached are the planning files for Orbit #566. Please respond to this thread with comments and approvals.   
>     Approvals are required by 1700, 20 April 2022 
>       
>     Please note the following: 
>        1. Battery Balancing this orbit 
>        2. Begin 2022/05/09 06:00:00– End 2022/05/09 07:30:00 
>        3. 
>        4.  Command Load Constraint Violation Report (CCVR) 
>        5.   IBEX_2022_120_o0566a_v001.ccvr 
>        6.    # Input files:         1 
>         #   IBEX_2022_120_o0566a_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 2022/04/30 11:21:42 UTC 
>         IBX-CLC-016: No command to enable spin pulse protection was found after 
>                      transition to science mode at 2022/05/04 07:22:45 UTC 
> 
>         ============== 
>         OTHER MESSAGES 
>         ============== 
>         NO MESSAGES. 
> 
> 
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