[Isocops] IBEX Orbit #485 ATS Approval ( 23 Apr - 02 May 2020 ) - v001 approval

KEN FAIRCHILD fair-play at comcast.net
Wed Apr 15 13:54:59 EDT 2020 

All,

Note: Angle at orbit 486 apogee after the perigee sun precession maneuver:  4.674 deg

I have looked at the orbit 485 ATS files,

IBEX_2020_113_o0485a_BUS_v001.scr

and

IBEX_2020_113_o0485a_INST_v001.scr,

and I approve.

The only constraint violations in

IBEX_2020_113_o0485a_BUS_v001_.ccvr

and

IBEX_2020_113_o0485a_INST_v001_.ccvr

are from the removal of the

ACT_SetSpinPulseProtectEnable Enable

commands (2); the violations are expected.

The PL commands in

IBEX_2020_113_o0485a_INST_v001.scr

match those in the v003 STF,

IBEX_2020_113_o0485a_v003.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_113_o0485a_v001.oef,

and as verified with ibex_orbit.

There is one star tracker outage.  The outage starts after 15 Re descending and runs for about 1 hour.  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_Orbit485_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 484 left us pointing in safe directions for the orbit 485 arc A ascending and descending sequences:

ibex_rotate -o -u 0.859739,0.472118,0.194816 -w ibex-sun -t 2020/04:23:08:33:50
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.859739,+0.472118,+0.194816
which is R.A. +28.773 Decl. +11.234
missing R.A. +31.132 Decl. +12.610 (ibex-sun)
error is R.A. +2.359 Decl. +1.376
for a total 2.687 deg

ibex_rotate -o -u 0.859739,0.472118,0.194816 -w ibex-sun -t 2020/04:26:22:48:36
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.859739,+0.472118,+0.194816
which is R.A. +28.773 Decl. +11.234
missing R.A. +34.626 Decl. +13.838 (ibex-sun)
error is R.A. +5.853 Decl. +2.604
for a total 6.278 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 0.81863,0.530873,0.219131 -w ibex-sun -t 2020/04:27:00:31:44
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.818630,+0.530873,+0.219131
which is R.A. +32.963 Decl. +12.658
missing R.A. +34.694 Decl. +13.862 (ibex-sun)
error is R.A. +1.731 Decl. +1.204
for a total 2.071 deg

ibex_rotate -o -u 0.81863,0.530873,0.219131 -w ibex-sun -t 2020/04:27:02:06:50
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.818630,+0.530873,+0.219131
which is R.A. +32.963 Decl. +12.658
missing R.A.+34.757 Decl. +13.884 (ibex-sun)
error is R.A. +1.794 Decl. +1.226
for a total 2.134 deg

ibex_rotate -o -u 0.81863,0.530873,0.219131 -w ibex-sun -t 2020/05:01:11:14:14
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.818630,+0.530873,+0.219131
which is R.A. +32.963 Decl. +12.658
missing R.A. +38.832 Decl. +15.226 (ibex-sun)
error is R.A. +5.869 Decl. +2.568
for a total 6.247 deg

The sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 486 apogee:

ibex_rotate -o -r +38.947 -d +15.257 -w ibex-sun -t 2020/05:01:14:17:59
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. +38.947 Decl. +15.257 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg

ibex_rotate -o -r +38.947 -d +15.257 -w ibex-sun -t 2020-05-06T07:45:51.515Z
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. +43.588 Decl. +16.649 (ibex-sun)
error is R.A. +4.641 Decl. +1.392
for a total 4.674 deg

No Lo O-mode.

There is no overlap with orbit 484 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken 

> On April 10, 2020 at 12:56 PM "Perry, Timothy E [US] (IS)" <Timothy.Perry at ngc.com> wrote:
> 
> 
>     All,
> 
>        Attached are the planning files for Orbit #485
> 
>     Please respond to this thread with comments and approvals.  
> 
>     Approvals are required by COB on 13 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.
> 
>      
> 
>     2.       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.
> 
>      
> 
>     3.       Battery Balancing
> 
>     # Orbit 485 Battery Balancing
> 
>     # 2020-05-01T21:48:29.446Z,Perigee,orbit:485
> 
>       @ECT_SetLongEclipseFlag TRUE $TIME=2020/05:01:21:00:00
> 
>       @ECT_SetLongEclipseFlag FALSE $TIME=2020/05:01:22:30:00
> 
>      
> 
>     4.       Command Load Constraint Violation Report (CCVR)
> 
>         IBEX_2020_113_o0485a_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 2020/04/23 06:10:09 UTC
> 
>         IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                      transition to science mode at 2020/04/27 01:36:50 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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