[Isocops] IBEX Orbit #516 ATS Approval (29 Jan – 7 Feb 21) - v001 approval

fair-play at comcast.net fair-play at comcast.net
Wed Jan 20 13:00:52 EST 2021 

All,

Note: Angle at orbit 516 perigee after the apogee sun precession maneuver: 3.997 deg

I have looked at the orbit 516 ATS files,

IBEX_2021_029_o0516a_BUS_v001.scr

and

IBEX_2021_029_o0516a_INST_v001.scr,

and I approve.

The only constraint violations in

IBEX_2021_029_o0516a_BUS_v001.ccvr

and

IBEX_2021_029_o0516a_INST_v001.ccvr

are from the removal of the

ACT_SetSpinPulseProtectEnable Enable

commands (2); the violations are expected.

The PL commands in

IBEX_2021_029_o0516a_INST_v001.scr

match those in the v002 STF,

IBEX_2021_029_o0516a_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_029_o0516a_BUS_v001.oef,

and as verified with ibex_orbit.

There are two star tracker outages. The first starts before orbit 515 perigee and ends 3+ days after 15 Re ascending.  The second starts 2- days after apogee and runs for about 9 hours.  Some despinning may be required due to these outages.

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

IBEX_Orbit516_Contacts.txt,

for all contacts (4).

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

The sun precession maneuver at perigee of orbit 515 left us pointing in safe directions for the orbit 516 arc A ascending and descending sequences:

ibex_rotate -o -r +311.600 -d -17.951 -w ibex-sun -t 2021/01:29:21:56:31
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.631607,-0.711396,-0.308204
which is R.A. +311.600 Decl. -17.951
missing R.A. +312.399 Decl. -17.773 (ibex-sun)
error is R.A. +0.799 Decl. +0.178
for a total 0.781 deg

ibex_rotate -o -r +311.600 -d -17.951 -w ibex-sun -t 2021/02:02:20:52:30
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.631607,-0.711396,-0.308204
which is R.A. +311.600 Decl. -17.951
missing R.A. +316.482 Decl. -16.606 (ibex-sun)
error is R.A. +4.882 Decl. +1.345
for a total 4.851 deg

The sun 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 -r +316.556 -d -16.583 -w ibex-sun -t 2021/02:02:22:40:38
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.695849,-0.659044,-0.285404
which is R.A. +316.556 Decl. -16.583
missing R.A. +316.556 Decl. -16.583 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg

ibex_rotate -o -r +316.556 -d -16.583 -w ibex-sun -t 2021/02:03:00:10:44
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.695849,-0.659044,-0.285404
which is R.A. +316.556 Decl. -16.583
missing R.A. +316.618 Decl. -16.564 (ibex-sun)
error is R.A. +0.062 Decl. +0.019
for a total 0.062 deg

ibex_rotate -o -r +316.556 -d -16.583 -w ibex-sun -t 2021/02:06:23:47:11
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.695849,-0.659044,-0.285404
which is R.A. +316.556 Decl. -16.583
missing R.A. +320.525 Decl. -15.392 (ibex-sun)
error is R.A. +3.969 Decl. +1.191
for a total 3.997 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 517 apogee:

ibex_rotate -o -u 0.76273,-0.589271,-0.266465 -w ibex-sun -t 2021/02:07:03:00:17
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.762730,-0.589271,-0.266465
which is R.A. +322.311 Decl. -15.454
missing R.A. +320.663 Decl. -15.355 (ibex-sun)
error is R.A. +1.648 Decl. +0.099
for a total 1.592 deg

ibex_rotate -o -u 0.76273,-0.589271,-0.266465 -w ibex-sun -t 2021-02-11T21:15:02.974Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.762730,-0.589271,-0.266465
which is R.A. +322.311 Decl. -15.454
missing R.A. +325.497 Decl. -13.781 (ibex-sun)
error is R.A. +3.186 Decl. +1.673
for a total 3.508 deg

Lo Normal mode for the entire orbit.

There is no overlap with orbit 515 commands by manual inspection or by checking at 

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

Command Approval Checklist is attached.

Ken

>     On 01/15/2021 3:01 PM Perry, Timothy E [US] (SP) <timothy.perry at ngc.com> wrote:
>      
>      
> 
>     All,
> 
>        Attached are the planning files for Orbit #516
> 
>     Please respond to this thread with comments and approvals.  
> 
>     Approvals are required by COB on 19 January 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. Apogee Sun Maneuver - 2021/02:02:22:25:38
> 
>      
> 
>        1. Battery Balancing this orbit
> 
>         Begin 2021/02:07:09:00:00 – End 2021/02:07:10:30:00
> 
>      
> 
>     6.       # Orbit# 513 Reset Master Timer  - 2021/01:20:17:45:00
> 
>      
> 
>     7.       Command Load Constraint Violation Report (CCVR)
> 
>         IBEX_2021_029_o0516a_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 2021/01/29 19:35:32 UTC
> 
>         IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                      transition to science mode at 2021/02/02 23:40:44 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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