[Isocops] IBEX Orbit #528 ATS Approval (19 – 28 May, 2021) - v001 approval

Sat May 8 16:41:04 EDT 2021

All,

I have looked at the orbit 528 ATS files,

IBEX_2021_139_o0528a_BUS_v001.scr

and

IBEX_2021_139_o0528a_INST_v001.scr,

and I approve.

The only constraint violations in

IBEX_2021_139_o0528a_BUS_v001.ccvr

and

IBEX_2021_139_o0528a_INST_v001.ccvr

are from the removal of the

ACT_SetSpinPulseProtectEnable Enable

commands (2); the violations are expected.

The PL commands in

IBEX_2021_139_o0528a_INST_v001.scr

match those in the v002 STF,

IBEX_2021_139_o0528a_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_2021_139_o0528a_BUS_v001.oef,

and as verified with ibex_orbit.

There is one star tracker outage.  The outage starts about 3 days after apogee and runs for about 1.5 days.  Some despinning my 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_Orbit528_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 precession maneuver at perigee of orbit 527 left us pointing in safe directions for the orbit 528 arc A ascending and descending sequences:

ibex_rotate -o -u 0.560428,0.763405,0.321142 -w ibex-sun -t 2021/05:19:13:20:50
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.560428,+0.763405,+0.321142
which is R.A. +53.717 Decl. +18.732
missing R.A. +56.229 Decl. +19.798 (ibex-sun)
error is R.A. +2.512 Decl. +1.066
for a total 2.600 deg

ibex_rotate -o -u 0.560428,0.763405,0.321142 -w ibex-sun -t 2021/05:23:07:23:45
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.560428,+0.763405,+0.321142
which is R.A. +53.717 Decl. +18.732
missing R.A. +60.053 Decl. +20.592 (ibex-sun)
error is R.A. +6.336 Decl. +1.860
for a total 6.249 deg

The inertial precession maneuver at apogee leaves us pointing in safe directions at the time of the maneuver and for the arc B ascending and descending sequences:

ibex_rotate -o -u 0.496176,0.800531,0.336093 -w ibex-sun -t 2021/05:23:09:06:53
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.496176,+0.800531,+0.336093
which is R.A. +58.209 Decl. +19.639
missing R.A. +60.126 Decl. +20.607 (ibex-sun)
error is R.A. +1.917 Decl. +0.968
for a total 2.044 deg

ibex_rotate -o -u 0.496176,0.800531,0.336093 -w ibex-sun -t 2021/05:23:10:41:59
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.496176,+0.800531,+0.336093
which is R.A. +58.209 Decl. +19.639
missing R.A. +60.194 Decl. +20.620 (ibex-sun)
error is R.A. +1.985 Decl. +0.981
for a total 2.106 deg

ibex_rotate -o -u 0.496176,0.800531,0.336093 -w ibex-sun -t 2021/05:27:23:26:15
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.496176,+0.800531,+0.336093
which is R.A. +58.209 Decl. +19.639
missing R.A. +64.749 Decl. +21.422 (ibex-run)
error is R.A. +6.540 Decl. +1.783
for a total 6.379 deg

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 529 apogee:

ibex_rotate -o -u 0.426961,0.833207,0.351384 -w ibex-sun -t 2021/05:28:09:43:51
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.426961,+0.833207,+0.351384
which is R.A. +62.868 Decl. +20.572
missing R.A. +65.158 Decl. +21.468 (ibex-sun)
error is R.A. +2.290 Decl. +0.896
for a total 2.318 deg

ibex_rotate -o -u 0.426961,0.833207,0.351384 -w ibex-sun -t 2021-06-01T22:49:19.050Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.426961,+0.833207,+0.351384
which is R.A. +62.868 Decl. +20.572
missing R.A. +69.839 Decl. +22.154 (ibex-sun)
error is R.A. +6.971 Decl. +1.582
for a total 6.682 deg

Lo Normal mode for the entire orbit.

There is no overlap with orbit 527 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken

>     On 05/05/2021 3:43 PM Perry, Timothy E [US] (SP) <timothy.perry at ngc.com> wrote:
>      
>      
> 
>     All,
> 
>        Attached are the planning files for Orbit #528. Please respond to this thread with comments and approvals.  
> 
>     Approvals are required by COB on 08 May 2021
> 
>      
> 
>     Please note the following:
> 
>        1. I generated 3 separate ATS files BUS, INST and a complete file. The BUS and INST will be the files to be uplinked. The complete ATS, I used as a sanity check to see how the commands lined up. Since we are in a new phase of ATS generation. IF you have any ideas of doing this differently, let me know.
> 
>          
> 
>        1. The 3 ATS files have been changed to word files and encrypted. I will send out another email with the password. The files that have been transferred via MFT have not been encrypted and are still text files.  
> 
>          
> 
>        1. I moved the 2 House Keeping commands from the INST ATS to the BUS ATS. I commented out the 2 commands in the INST ATS. If for some reason we were unable to uplink the INST Commands for this orbit, we would have been in the wrong spacecraft state for executing the maneuver commands.
> 
>      
> 
>        1. Battery Balancing this orbit
> 
>         Begin 2021/05:28:11:00:00– End 2021/05:28:12:30:00
> 
>          
> 
>     5.       Orbit# 526 Reset Master Timer  - 2021/05:10:10:45:00
> 
>      
> 
>        1. APL Contact 2021-05-10,04:00:00- 2021-05-10,05:00:00
> 
>         Just a reminder for the APL contact. We start off at 2k D\L, after 5 minutes we switch to 320k D\L, Then 5 minutes later we start the SSR Dump with Dump New command
> 
>      
> 
>     7.       Command Load Constraint Violation Report (CCVR)
> 
>         IBEX_2021_139_o0528a_v001.ccvr
> 
>         # Input files:         1
> 
>         #   IBEX_2021_139_o0528a_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 2021/05/19 09:31:33 UTC
> 
>         IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                      transition to science mode at 2021/05/23 10:11:59 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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