[Isocops] IBEX Orbit# 418 ATS V002 Approval - v002 approval

Mon Aug 13 23:58:48 EDT 2018

All,

I have looked at the orbit 418 ATS,

IBEX_2018_235_o0418a_v002.scr,

and I approve.

The only constraint violations in

IBEX_2018_235_o0418a_v002.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_2018_235_o0418a_v002.stf,

except the ATS has an SSR_DUMP_NEW command.  This is expected as APL is being used for the dump pass.

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_2018_235_o0418a_v002.oef,

and as verified with ibex_orbit.

There are two star tracker outages.  The first starts 1.5+ hours before 15 Re ascending and runs for 1+ days.  The second starts about 3.5 hours after perigee and runs for 4+ hours.  Some despinning may be required due to the first outage.

There is one moon in Lo FOV session in arc B.  The ATS start time is about 3.5 hours after that in the OEF and the ATS end time is 2 hours before that in the OEF.  These differences are not unusual.

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

IBEX_Orbit418_v002_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 417 left us pointing in safe directions for the orbit 418 arc A ascending and descending sequences:

ibex_rotate -o -u -0.847595,0.490445,0.202599 -w ibex-sun -t 2018/08:24:04:57:12

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.847595,+0.490445,+0.202599

which is R.A. +149.945 Decl. +11.689

missing R.A. +152.778 Decl. +11.192 (ibex-sun)

error is R.A. +2.833 Decl. +0.497

for a total 2.821 deg

ibex_rotate -o -u -0.847595,0.490445,0.202599 -w ibex-sun -t 2018/08:27:17:50:37

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.847595,+0.490445,+0.202599

which is R.A. +149.945 Decl. +11.689

missing R.A. +155.957 Decl. +10.001 (ibex-sun)

error is R.A. +6.013 Decl. +1.688

for a total 6.141 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 -0.884831,0.431446,0.175865 -w ibex-sun -t 2018/08:27:19:33:45

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.884831,+0.431446,+0.175865

which is R.A. +154.006 Decl. +10.129

missing R.A. +156.024 Decl. +9.977 (ibex-sun)

error is R.A. +2.018 Decl. +0.152

for a total 1.993 deg

ibex_rotate -o -u -0.884831,0.431446,0.175865 -w ibex-sun -t 2018/08:27:21:08:51

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.884831,+0.431446,+0.175865

which is R.A. +154.006 Decl. +10.129

missing R.A. +156.085 Decl. +9.955 (ibex-sun)

error is R.A. +2.079 Decl. +0.174

for a total 2.055 deg

ibex_rotate -o -u -0.884831,0.431446,0.175865 -w ibex-sun -t 2018/09:01:06:23:02

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.884831,+0.431446,+0.175865

which is R.A. +154.006 Decl. +10.129

missing R.A. +160.188 Decl. +8.385 (ibex-sun)

error is R.A. +6.182 Decl. +1.744

for a total 6.345 deg

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 419 apogee:

ibex_rotate -o -u -0.917956,0.367509,0.149311 -w ibex-sun -t 2018/09:01:08:59:08

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.917956,+0.367509,+0.149311

which is R.A. +158.181 Decl. +8.587

missing R.A. +160.286 Decl. +8.342 (ibex-sun)

error is R.A. +2.105 Decl. +0.245

for a total 2.096 deg

ibex_rotate -o -u -0.917956,0.367509,0.149311 -w ibex-sun -t 2018-09-06T07:46:56.431Z

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.917956,+0.367509,+0.149311

which is R.A. +158.181 Decl. +8.587

missing R.A. +164.642 Decl. +6.543 (ibex-sun)

error is R.A. +6.461 Decl. +2.044

for a total 6.722 deg

No Lo O-mode.

There is no overlap with orbit 417 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken 

> On August 13, 2018 at 4:03 PM "Wesley, Sheral" <Sheral.Wesley at OrbitalATK.com> wrote:
> 
> 
>     Guys,
> 
>     Here is v002 of the Orbit# 418 ATS.
> 
>     All of the files were regenerated and the APL-18 contact added again
> 
>      
> 
> 
> 
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