[Isocops] IBEX Orbit #473 ATS Approval ( 5 - 14 Jan 2020 ) - v002 approval

KEN FAIRCHILD fair-play at comcast.net
Thu Dec 26 05:38:02 EST 2019 

All,

Note: Angle at orbit 473 arc B descending after apogee sun precession maneuver:  4.342 deg

I have looked at the orbit 473 ATS,

IBEX_2020_004_o0473a_v002.scr,

and I approve.

The only constraint violations in

IBEX_2020_004_o0473a_v001_.ccvr

are from the removal of the

ACT_SetSpinPulseProtectEnable Enable

commands (2); the violations are expected.

The PL commands in the v002 ATS match those in the v002 STF,

IBEX_2020_004_o0473a_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_004_o0473a_v001.oef,

and as verified with ibex_orbit.

There is one star tracker outage.  The outage starts 2+ days after 15 Re ascending and runs for 4+ days.  Some despinning may 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_Orbit473_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 inertial maneuver at perigee of orbit 472 left us pointing in safe directions for the orbit 473 arc A ascending and descending sequences:

ibex_rotate -o -u 0.25639,-0.88273,-0.393765 -w ibex-sun -t 2020/01:05:06:35:18
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.256390,-0.882730,-0.393765
which is R.A. +286.196 Decl. -23.189
missing R.A. +285.337 Decl. -22.709 (ibex-sun)
error is R.A. +0.859 Decl. +0.480
for a total 0.925 deg

ibex_rotate -o -u 0.25639,-0.88273,-0.393765 -w ibex-sun -t 2020/01:09:12:50:51
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.256390,-0.882730,-0.393765
which is R.A. +286.196 Decl. -23.189
missing R.A. +289.984 Decl. -22.158 (ibex-sun)
error is R.A. +3.788 Decl. +1.031
for a total 3.644 deg

The sun 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 -r +290.064 -d -22.147 -w ibex-sun -t 2020/01:09:14:38:59
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.317758,-0.870007,-0.376984
which is R.A. +290.064 Decl. -22.147
missing R.A. +290.064 Decl. -22.147 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg

ibex_rotate -o -r +290.064 -d -22.147 -w ibex-sun -t 2020/01:09:16:09:05
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.317758,-0.870007,-0.376984
which is R.A. +290.064 Decl. -22.147
missing R.A. +290.131 Decl. -22.138 (ibex-sun)
error is R.A. +0.067 Decl. +0.009
for a total 0.063 deg

ibex_rotate -o -r +290.064 -d -22.147 -w ibex-sun -t 2020/01:13:21:55:31
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.317758,-0.870007,-0.376984
which is R.A. +290.064 Decl. -22.147
missing R.A. +294.686 Decl. -21.481 (ibex-sun)
error is R.A. +4.622 Decl. +0.666
for a total 4.342 deg

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 474 apogee:

ibex_rotate -o -u 0.414375,-0.830927,-0.371287 -w ibex-sun -t 2020/01:14:01:14:01
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.414375,-0.830927,-0.371287
which is R.A. +296.505 Decl. -21.795
missing R.A. +294.843 Decl. -21.463 (ibex-sun)
error is R.A. +1.662 Decl. +0.332
for a total 1.581 deg

ibex_rotate -o -u 0.414375,-0.830927,-0.371287 -w ibex-sun -t 2020-01-18T22:10:09.568Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.414375,-0.830927,-0.371287
which is R.A. +296.505 Decl. -21.795
missing R.A. +300.123 Decl. -20.544 (ibex-sun)
error is R.A. +3.618 Decl. +1.251
for a total 3.598 deg

No Lo O-mode.

There is no overlap with orbit 472 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken




> On December 23, 2019 at 10:49 AM "Perry, Timothy E [US] (IS)" <Timothy.Perry at ngc.com> wrote:
> 
> 
>     All,
> 
>        Merry Christmas…
> 
>     Attached are the planning files for Orbit #473
> 
>     Please respond to this thread with comments and approvals.  
> 
>     Approvals are required by COB on 24 Dec 2019.
> 
>      
> 
>     Please note the following:
> 
>     1.       Battery Balancing – Since I skipped last orbit due to the Eclipse. I will restart the cycle with this orbit and the next.
> 
>     # Orbit 473 Battery Balancing 
> 
>     # 2020-01-14T07:42:14.961Z,Perigee,orbit:473
> 
>       @ECT_SetLongEclipseFlag TRUE $TIME=2019/01:14:07:00:00
> 
>       @ECT_SetLongEclipseFlag FALSE $TIME=2019/01:14:08:30:00  
> 
>      
> 
>     2.       Apogee Sun maneuver - 2020/01:09:14:23:59
> 
>      
> 
>     3.       Command Load Constraint Violation Report (CCVR)
> 
>         IBEX_2020_004_o0473a_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 2020/01/05 03:56:42 UTC
> 
>         IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                      transition to science mode at 2020/01/09 15:39:05 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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