[Isocops] IBEX Orbit #569 ATS Approval (26 May – 05 June 2022) - v001 approval

Tue May 17 11:22:45 EDT 2022

All,

I have looked at the orbit 569 ATS,

IBEX_2022_146_o0569a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2022_146_o0569a_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_146_o0569a_v001.oef,

and as verified with ibex_orbit.

There is one star tracker outage.  The outage starts ~5 hours before perigee and runs for about 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_Orbit569_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 568 leaves us pointing in safe directions for the orbit 569 arc A ascending and descending sequences:

ibex_rotate -o -u 0.452191,0.821888,0.346445 -w ibex-sun -t 2022/05:27:09:57:24
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. +63.882 Decl. +21.246 (ibex-sun)
error is R.A. +2.701 Decl. +0.976
for a total 2.707 deg

ibex_rotate -o -u 0.452191,0.821888,0.346445 -w ibex-sun -t 2022/05:30:23:30:12
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. +67.541 Decl. +21.837 (ibex-sun)
error is R.A. +6.360 Decl. +1.567
for a total 6.138 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 0.384969,0.850711,0.357895 -w ibex-sun -t 2022/05:31:01:13:20
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.384969,+0.850711,+0.357895
which is R.A. +65.652 Decl. +20.971
missing R.A. +67.615 Decl. +21.849 (ibex-sun)
error is R.A. +1.963 Decl. +0.878
for a total 2.028 deg

ibex_rotate -o -u 0.384969,0.850711,0.357895 -w ibex-sun -t 2022/05:31:02:48:26
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.384969,+0.850711,+0.357895
which is R.A. +65.652 Decl. +20.971
missing R.A. +67.684 Decl. +21.860 (ibex-sun)
error is R.A. +2.032 Decl. +0.889
for a total 2.090 deg

ibex_rotate -o -u 0.384969,0.850711,0.357895 -w ibex-sun -t 2022/06:04:11:49:43 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.384969,+0.850711,+0.357895
which is R.A. +65.652 Decl. +20.971
missing R.A. +72.196 Decl. +22.445 (ibex-sun)
error is R.A. +6.544 Decl. +1.474
for a total 6.255 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 570 apogee:

ibex_rotate -o -u 0.313077,0.87492,0.369455 -w ibex-sun -t 2022/06:04:14:31:22
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.313077,+0.874920,+0.369455
which is R.A. +70.311 Decl. +21.682
missing R.A. +72.306 Decl. +22.453 (ibex-sun)
error is R.A. +1.995 Decl. +0.771
for a total 2.003 deg

ibex_rotate -o -u 0.313077,0.87492,0.369455 -w ibex-sun -t 2022-06-09T09:26:45.248Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.313077,+0.874920,+0.369455
which is R.A. +70.311 Decl. +21.682
missing R.A. +77.215 Decl. +22.929 (ibex-sun)
error is R.A. +6.904 Decl. +1.247
for a total 6.508 deg

Lo Normal mode for the entire orbit.

There is no overlap with orbit 568 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken

>     On 05/13/2022 12:04 PM Perry, Timothy E [US] (SP) <timothy.perry at ngc.com> wrote:
> 
> 
>     All, 
>        Attached are the planning files for Orbit #569. Please respond to this thread with comments and approvals.   
>     Approvals are required by 1800, 17 May 2022 
>       
>     Please note the following: 
> 
>        1. Battery Balancing this orbit 
>         Begin 2022/06/04 23:00:00 – End 2022/06/05 00:30:00 
>        1. Command Load Constraint Violation Report (CCVR) 
>         IBEX_2022_146_o0569a_v001.ccvr 
>         # Input files:         1 
>         #   IBEX_2022_146_o0569a_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 2022/05/27 08:00:47 UTC 
>         IBX-CLC-016: No command to enable spin pulse protection was found after 
>                      transition to science mode at 2022/05/31 02:18:26 UTC 
> 
>         ============== 
>         OTHER MESSAGES 
>         ============== 
>         NO MESSAGES. 
> 
> 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.sr.unh.edu/pipermail/isocops/attachments/20220517/b155d8ad/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: IBEX-Command-Approval-Checklist-Rev16h-o0569_KWF.doc
Type: application/msword
Size: 120832 bytes
Desc: not available
URL: <https://lists.sr.unh.edu/pipermail/isocops/attachments/20220517/b155d8ad/IBEX-Command-Approval-Checklist-Rev16h-o0569_KWF-0001.doc>