All,

I have looked at the orbit 411 ATS,

IBEX_2018_171_o0411a_v002.scr,

and I approve.

The only constraint violations in

IBEX_2018_171_o0411a_v001_.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 v002 STF,

IBEX_2018_171_o0411a_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_2018_171_o0411a_v001.oef,

and as verified with ibex_orbit.

There are two star tracker outages; they overlap. The first starts 15 1/2 hours before 15 Re descending and runs for 1+ days.  The second outage ends about 20 minutes after the first one ends.  Some despinning may be required due to the first outage.

There are two moon in Lo FOV sessions in the ATS; there is only one in the OEF.  The first session is in arc A; the second starts in arc A and ends in arc B.  The ATS start time for the first session is the same as that in the OEF and the end time of the second session is about 4 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_Orbit411_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 maneuver at perigee of orbit 410 left us pointing in safe directions for the orbit 411 arc A ascending and descending sequences:

ibex_rotate -o -u 0.066062,0.919133,0.388368 -w ibex-sun -t 2018/06:20:12:06:42

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  +0.066062,+0.919133,+0.388368

 which is     R.A.  +85.889 Decl. +22.853

 missing      R.A.  +88.741 Decl. +23.411 (ibex-sun)

 error is     R.A.   +2.852 Decl.  +0.558

 for a total  2.681 deg

ibex_rotate -o -u 0.066062,0.919133,0.388368 -w ibex-sun -t 2018/06:24:04:19:25

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  +0.066062,+0.919133,+0.388368

 which is     R.A.  +85.889 Decl. +22.853

 missing      R.A.  +92.620 Decl. +23.396 (ibex-sun)

 error is     R.A.   +6.731 Decl.  +0.544

 for a total  6.213 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 -0.009425,0.921504,0.388256 -w ibex-sun -t 2018/06:24:06:02:33

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.009425,+0.921503,+0.388256

 which is     R.A.  +90.586 Decl. +22.846

 missing      R.A.  +92.696 Decl. +23.396 (ibex-sun)

 error is     R.A.   +2.110 Decl.  +0.550

 for a total  2.017 deg

ibex_rotate -o -u -0.009425,0.921504,0.388256 -w ibex-sun -t 2018/06:24:07:37:39

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.009425,+0.921503,+0.388256

 which is     R.A.  +90.586 Decl. +22.846

 missing      R.A.  +92.766 Decl. +23.396 (ibex-sun)

 error is     R.A.   +2.180 Decl.  +0.550

 for a total  2.079 deg

ibex_rotate -o -u -0.009425,0.921504,0.388256 -w ibex-sun -t 2018/06:28:18:34:55

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.009425,+0.921503,+0.388256

 which is     R.A.  +90.586 Decl. +22.846

 missing      R.A.  +97.395 Decl. +23.287 (ibex-sun)

 error is     R.A.   +6.809 Decl.  +0.441

 for a total  6.279 deg

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 412 apogee:

ibex_rotate -o -u -0.087068,0.917661,0.387709 -w ibex-sun -t 2018/06:29:11:30:46

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.087068,+0.917661,+0.387709

 which is     R.A.  +95.420 Decl. +22.812

 missing      R.A.  +98.073 Decl. +23.219 (ibex-sun)

 error is     R.A.   +2.653 Decl.  +0.407

 for a total  2.475 deg

ibex_rotate -o -u -0.087068,0.917661,0.387709 -w ibex-sun -t 2018-07-03T20:29:02.780Z

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.087068,+0.917661,+0.387709

 which is     R.A.  +95.420 Decl. +22.812

 missing      R.A. +102.630 Decl. +22.918 (ibex-sun)

 error is     R.A.   +7.210 Decl.  +0.106

 for a total  6.644 deg

No Lo O-mode.

There is no overlap with orbit 410 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken

On June 7, 2018 at 1:41 PM "Wesley, Sheral" <Sheral.Wesley@OrbitalATK.com> wrote:

Guys,

Here are the planning files and ATS for Orbit# 411. 

Please respond to this email thread with your comments and approvals

Approvals are required before 9 Jun 18 @1300 UTC

 

Note the following:

1.       We are now Northrup Grumman!!!!!!!

Our new email accounts with be  firstname.lastname@ngc.com

The old orbitalatk email addresses will remain in effect for up to a year

 

2.       Moon in Lo FOV Commands

# 2018-06-20T13:49:58.504Z,MoonInLoFovStart,orbit:411

# 2018-06-24T19:58:59.420Z,MoonInLoFovStop,orbit:411

 

3.       PERIGEE Battery Balancing

# Orbit# 411 PERIGEE Battery Balancing

# 2018-06-29T06:05:44.540Z,Perigee,orbit:411

SetLongEclipseFlag TRUE $TIME=2018/06:29:06:00:00

SetLongEclipseFlag FALSE $TIME=2018/06:29:07:30:00 

 

4.       Command Load Constraint Violation Report

IBEX_2018_171_o0411a_v001.scr

 

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

HARD CONSTRAINT VIOLATIONS

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

NO VIOLATIONS.

 

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

SOFT CONSTRAINT VIOLATIONS

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

IBX-CLC-006: Planned transmission at 2018/06/20 12:43:00 UTC - 2018/06/20

             14:17:00 UTC exceeds the maximum contiguous transmission time of

             5400 seconds

**IBEX,USAK01,ADD,06/29/18,180,18:30:00,06/29/18,180,20:00:00,,LAHO 40K IBEX-2 Hi-Background/Magneto Tail Table Uploads * *

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

             transition to science mode at 2018/06/20 10:18:15 UTC

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

             transition to science mode at 2018/06/24 07:07:39 UTC

 

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

OTHER MESSAGES

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

NO MESSAGES.

 

 

Sheral  R. Wesley

Sr Systems Engineer

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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