All,

I have looked at the orbit 419 ATS,

IBEX_2018_244_o0419a_v002.scr,

and I approve.

The only constraint violations in

IBEX_2018_244_o0419a_v002_.ccvr

are from a long contact and the removal of the

ACT_SetSpinPulseProtectEnable Enable

commands (2); the violations are expected.

The PL commands in the v002 ATS match those in the v004 STF,

IBEX_2018_244_o0419a_v004.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_2018_244_o0419a_v002.oef,

and as verified with ibex_orbit.

There are no star tracker outages.

There is one moon in Lo FOV session in arc A.  The ATS start time is 6+ hours after that in the OEF and the ATS end time is 3+ hours after that in the OEF.  Differences in timings are not unusual.

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

IBEX_Orbit419_Contacts.txt,

for all contacts (4).

We are not doing battery cell balancing this orbit; we'll do it again in the next orbit.

The inertial maneuver at perigee of orbit 418 left us pointing in safe directions for the orbit 419 arc A ascending and descending sequences:

ibex_rotate -o -u -0.917956,0.367509,0.149311 -w ibex-sun -t 2018/09:02:05:08:33

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. +160.997 Decl. +8.010 (ibex-sun)

error is R.A. +2.816 Decl. +0.577

for a total 2.845 deg

ibex_rotate -o -u -0.917956,0.367509,0.149311 -w ibex-sun -t 2018/09:05:20:13:47

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. +164.202 Decl. +6.717 (ibex-sun)

error is R.A. +6.021 Decl. +1.870

for a total 6.253 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:

for a total 1.996 deg

ibex_rotate -o -u -0.945612,0.302383,0.119929 -w ibex-sun -t 2018/09:05:23:32:01

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.945612,+0.302383,+0.119929

which is R.A. +162.267 Decl. +6.888

missing R.A. +164.327 Decl. +6.667 (ibex-sun)

error is R.A. +2.060 Decl. +0.221

for a total 2.058 deg

ibex_rotate -o -u -0.945612,0.302383,0.119929 -w ibex-sun -t 2018/09:10:11:06:25

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.945612,+0.302383,+0.119929

which is R.A. +162.267 Decl. +6.888

missing R.A. +168.485 Decl. +4.972 (ibex-sun)

error is R.A. +6.218 Decl. +1.916

for a total 6.474 deg

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 420 apogee:

ibex_rotate -o -u -0.968216,0.232967,0.091015 -w ibex-sun -t 2018/09:10:13:41:32

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.968216,+0.232967,+0.091015

which is R.A. +166.471 Decl. +5.222

missing R.A. +168.582 Decl. +4.927 (ibex-sun)

error is R.A. +2.111 Decl. +0.295

for a total 2.124 deg

ibex_rotate -o -u -0.968216,0.232967,0.091015 -w ibex-sun -t 2018-09-15T10:11:49.610Z

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.968216,+0.232967,+0.091015

which is R.A. +166.471 Decl. +5.222

missing R.A. +172.814 Decl. +3.098 (ibex-sun)

error is R.A. +6.343 Decl. +2.124

for a total 6.673 deg

No Lo O-mode.

There is no overlap with orbit 418 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken

On August 21, 2018 at 6:30 PM "Wesley, Sheral" <Sheral.Wesley@OrbitalATK.com> wrote:

Here is v002 of the Orbit# 419 ATS

The OEF and ATS were generated with v004 Orbit# 419 STF

 

1.       Command Load Constraint Violation Report

IBEX_2018_244_o0419a_v002.scr

 

==========================

HARD CONSTRAINT VIOLATIONS

==========================

NO VIOLATIONS.

 

==========================

SOFT CONSTRAINT VIOLATIONS

==========================

IBX-CLC-006: Planned transmission at 2018/09/10 09:43:00 UTC - 2018/09/10

             11:17:00 UTC exceeds the maximum contiguous transmission time of

             5400 seconds

** IBEX,USHI02,ADD,09/10/18,253,09:45:00,09/10/18,253,11:15:00,,LAHO 160K IBEX-2 Orbit# 419 Hi_Background Test Contact**

IBX-CLC-016: No command to enable spin pulse protection was found after

             transition to science mode at 2018/09/02 03:20:47 UTC

IBX-CLC-016: No command to enable spin pulse protection was found after

             transition to science mode at 2018/09/05 23:02:01 UTC

 

==============

OTHER MESSAGES

==============

NO MESSAGES.

 

 

Sheral  R. Wesley

Sr Systems Engineer

ICESat-2,IBEX , OCO2 Mission OPS

CRS/CYGNUS Mission Planning

Northrop Grumman Innovation Systems

Bldg. 2   Room 1337

Office (703) 406-5641

Cell (202) 236-0802

 

 

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