[Isocops] IBEX Orbit #476 ATS Approval (2 - 11 Feb 2020) - v001 approval

KEN FAIRCHILD fair-play at comcast.net
Wed Jan 22 18:24:44 EST 2020 

All,

I have looked at the orbit 476 ATS,

IBEX_2020_032_o0476a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2020_032_o0476a_v001_.ccvr

are from the removal of the

ACT_SetSpinPulseProtectEnable Enable

commands (2); the violations are expected.

The PL commands in the v001 ATS match those in the v002 STF,

IBEX_2020_032_o0476a_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_032_o0476a_v001.oef,

and as verified with ibex_orbit.

There is one star tracker outage.  The outage starts one day after apogee and runs for almost 2 1/2 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_Orbit476_Contacts.txt,

for all contacts (2).

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 475 left us pointing in safe directions for the orbit 476 arc A ascending and descending sequences:

ibex_rotate -o -u 0.684385,-0.664862,-0.299291 -w ibex-sun -t 2020/02:02:02:39:33
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.684385,-0.664862,-0.299291
which is R.A. +315.829 Decl. -17.415
missing R.A. +314.911 Decl. -17.089 (ibex-sun)
error is R.A. +0.918 Decl. +0.326
for a total 0.936 deg

ibex_rotate -o -u 0.684385,-0.664862,-0.299291 -w ibex-sun -t 2020/02:05:21:41:45
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.684385,-0.664862,-0.299291
which is R.A. +315.829 Decl. -17.415
missing R.A. +318.801 Decl. -15.933 (ibex-sun)
error is R.A. +2.972 Decl. +1.482
for a total 3.210 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 0.742163,-0.611226,-0.274949 -w ibex-sun -t 2020/02:05:23:24:53
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.742163,-0.611226,-0.274949
which is R.A. +320.526 Decl. -15.959
missing R.A. +318.872 Decl. -15.911 (ibex-sun)
error is R.A. +1.654 Decl. + 0.048
for a total 1.591 deg

ibex_rotate -o -u 0.742163,-0.611226,-0.274949 -w ibex-sun -t 2020/02:06:00:59:59
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.742163,-0.611226,-0.274949
which is R.A. +320.526 Decl. -15.959
missing R.A. +318.937 Decl. -15.890 (ibex-sun)
error is R.A. +1.589 Decl. +0.069
for a total 1.529 deg

ibex_rotate -o -u 0.742163,-0.611226,-0.274949 -w ibex-sun -t 2020/02:10:16:17:31
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.742163,-0.611226,-0.274949
which is R.A. +320.526 Decl. -15.959
missing R.A. +323.458 Decl. -14.456 (ibex-sun)
error is R.A. +2.932 Decl. +1.503
for a total 3.204 deg

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 477 apogee:

ibex_rotate -o -u 0.795094,-0.552337,-0.250498 -w ibex-sun -t 2020/02:10:19:46:34
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.795094,-0.552337,-0.250498
which is R.A. +325.213 Decl. -14.507
missing R.A. +323.608 Decl. -14.414 (ibex-sun)
error is R.A. +1.606 Decl. +0.093
for a total 1.557 deg

ibex_rotate -o -u 0.795094,-0.552337,-0.250498 -w ibex-sun -t 2020-02-15T14:59:01.965Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.795094,-0.552337,-0.250498
which is R.A. +325.213 Decl. -14.507
missing R.A. +328.425 Decl. -12.777 (ibex-sun)
error is R.A. +3.212 Decl. +1.730
for a total 3.568 deg

No Lo O-mode.

There is no overlap with orbit 475 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken


> On January 20, 2020 at 10:11 AM "Perry, Timothy E [US] (IS)" <Timothy.Perry at ngc.com> wrote:
> 
> 
>     All,
> 
>        Attached are the planning files for Orbit #476
> 
>     Please respond to this thread with comments and approvals.  
> 
>     Approvals are required by COB on 22 Jan 2020
> 
>      
> 
>     Please note the following:
> 
>     1.       Battery Balancing
> 
>     # Orbit 476 Battery Balancing
> 
>     # 2020-02-11T01:47:32.082Z,Perigee,orbit:476
> 
>       @ECT_SetLongEclipseFlag TRUE $TIME=2020/02:11:01:00:00
> 
>       @ECT_SetLongEclipseFlag FALSE $TIME=2020/02:11:02:30:00
> 
>      
> 
>     2.       Command Load Constraint Violation Report (CCVR)
> 
>         IBEX_2020_032_o0476a_v001_.ccvr
> 
>         # Input files:         1
> 
>         #   IBEX_2020_032_o0476a_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 2020/02/01 23:58:34 UTC
> 
>         IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                      transition to science mode at 2020/02/06 00:29:59 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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