[Isocops] [WARNING: MESSAGE ENCRYPTED]IBEX Orbit #486 ATS Approval ( 02 - 11 May 2020 ) - v001 approval

Sun Apr 19 10:11:32 EDT 2020

All,

I have looked at the orbit 486 ATS files,

IBEX_2020_122_o0486a_BUS_v001.scr

and

IBEX_2020_122_o0486a_INST_v001.scr,

and I approve.

The only constraint violations in

IBEX_2020_122_o0486a_BUS_v001.ccvr

and

IBEX_2020_122_o0486a_INST_v001_.ccvr

are from the removal of the

ACT_SetSpinPulseProtectEnable Enable

commands (2); the violations are expected.

The PL commands in 

IBEX_2020_122_o0486a_INST_v001.scr

match those in the v002 STF,

IBEX_2020_122_o0486a_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_2020_122_o0486a_BUS_v001.oef,

and as verified with ibex_orbit.

There are two star tracker outages.  The first outage starts 2+ days after apogee and runs for about a day.  The second outage starts just after 15 Re descending and runs for about 5 hours.  Some despinning may be required due to the first outage.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file,

IBEX_Orbit486_Contacts.txt,

for all contacts (3).

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

The sun precession maneuver at perigee of orbit 485 left us pointing in safe directions for the orbit 486 arc A ascending and descending sequences:

ibex_rotate -o -r +38.947 -d +15.257 -w ibex-sun -t 2020/05:02:08:18:23
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.750317,+0.606446,+0.263149
which is R.A. +38.947 Decl. +15.257
missing R.A. +39.657 Decl. +15.442 (ibex-sun)
error is R.A. +0.710 Decl. +0.185
for a total 0.709 deg

ibex_rotate -o -r +38.947 -d +15.257 -w ibex-sun -t 2020/05:05:20:12:43
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.750317,+0.606446,+0.263149
which is R.A. +38.947 Decl. +15.257
missing R.A. +43.118 Decl. +16.505 (ibex-sun)
error is R.A. +4.171 Decl. +1.248
for a total 4.201 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 0.723236,0.637573,0.265388 -w ibex-sun -t 2020/05:05:21:55:51
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.723236,+0.637573,+0.265388
which is R.A. +41.398 Decl. +15.390
missing R.A. +43.188 Decl. +16.526 (ibex-sun)
error is R.A. +1.790 Decl. +1.136
for a total 2.062 deg

ibex_rotate -o -u 0.723236,0.637573,0.265388 -w ibex-sun -t 2020/05:05:23:30:57
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.723236,+0.637573,+0.265388
which is R.A. +41.398 Decl. +15.390
missing R.A. +43.252 Decl. +16.546 (ibex-sun)
error is R.A. +1.854 Decl. +1.156
for a total 2.125 deg

ibex_rotate -o -u 0.723236,0.637573,0.265388 -w ibex-sun -t 2020/05:10:06:27:43
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.723236,+0.637573,+0.265388
which is R.A. +41.398 Decl. +15.390
missing R.A. +47.341 Decl. +17.702 (ibex-sun)
error is R.A. +5.943 Decl. +2.312
for a total 6.148 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 487 apogee:

ibex_rotate -o -u 0.669273,0.685255,0.287227 -w ibex-sun -t 2020/05:10:13:14:20
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.669273,+0.685255,+0.287227
which is R.A. +45.676 Decl. +16.692
missing R.A. +47.602 Decl. +17.758 (ibex-sun)
error is R.A. +1.926 Decl. +1.066
for a total 2.126 deg

ibex_rotate -o -u 0.669273,0.685255,0.287227 -w ibex-sun -t 2020-05-15T03:41:27.230Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.669273,+0.685255,+0.287227
which is R.A. +45.676 Decl. +16.692
missing R.A. +52.211 Decl. +18.918 (ibex-sun)
error is R.A. +6.535 Decl. +2.226
for a total 6.608 deg

No Lo O-mode.

There is no overlap with orbit 485 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken

> On April 16, 2020 at 3:09 PM "Perry, Timothy E [US] (IS)" <Timothy.Perry at ngc.com> wrote:
> 
> 
>     All,
> 
>        Attached are the planning files for Orbit #486
> 
>     Please respond to this thread with comments and approvals.  
> 
>     Approvals are required by COB on 18 April 2020
> 
>      
> 
>     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 docx 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. Master Timer Command for Orbit #484  
> 
>          # Orbit# 484 Reset Master Timer
> 
>           @EMR_StrobeMReset $TIME=2020/04:23:05:45:00
> 
>      
> 
>     5.       Battery Balancing
> 
>     # Orbit 486 Battery Balancing
> 
>     # 2020-05-10T17:12:28.526Z,Perigee,orbit:486
> 
>       @ECT_SetLongEclipseFlag TRUE $TIME=2020/05:10:17:00:00
> 
>       @ECT_SetLongEclipseFlag FALSE $TIME=2020/05:10:18:30:00   
> 
>      
> 
>     6.       Command Load Constraint Violation Report (CCVR)
> 
>         IBEX_2020_122_o0486a_v001.ccvr
> 
>          
> 
>         ==========================
> 
>         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 2020/05/02 06:02:54 UTC
> 
>         IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                      transition to science mode at 2020/05/05 23:00:57 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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