All,

I have looked at the orbit 423 ATS,

IBEX_2018_280_o0423a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2018_280_o0423a_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_2018_280_o0423a_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_280_o0423a_v001.oef,

and as verified with ibex_orbit.

There are no star tracker outages.

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

IBEX_Orbit423_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 422 left us pointing in safe directions for the orbit 423 arc A ascending and descending sequences:

ibex_rotate -o -u -0.978852,-0.183859,-0.089694 -w ibex-sun -t 2018/10:08:07:05:06

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.978852,-0.183859,-0.089694

which is R.A. +190.638 Decl. -5.146

missing R.A. +193.536 Decl. -5.818 (ibex-sun)

error is R.A. +2.898 Decl. +0.672

for a total 2.962 deg

ibex_rotate -o -u -0.978852,-0.183859,-0.089694 -w ibex-sun -t 2018/10:11:18:39:32

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.978852,-0.183859,-0.089694

which is R.A. +190.638 Decl. -5.146

missing R.A. +196.626 Decl. -7.085 (ibex-sun)

error is R.A. +5.988 Decl. +1.939

for a total 6.262 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 -0.960329,-0.251615,-0.120241 -w ibex-sun -t 2018/10:11:20:22:40

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.960329,-0.251615,-0.120241

which is R.A. +194.682 Decl. -6.906

missing R.A. +196.692 Decl. -7.111 (ibex-sun)

error is R.A. +2.010 Decl. +0.205

for a total 2.006 deg

ibex_rotate -o -u -0.960329,-0.251615,-0.120241 -w ibex-sun -t 2018/10:11:21:57:46

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.960329,-0.251615,-0.120241

which is R.A. +194.682 Decl. -6.906

missing R.A. +196.753 Decl. -7.135 (ibex-sun)

error is R.A. +2.071 Decl. +0.229

for a total 2.068 deg

ibex_rotate -o -u -0.960329,-0.251615,-0.120241 -w ibex-sun -t 2018/10:16:04:16:09

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

points axis +1.000000,+0.000000,+0.000000

towards ECI-0.960329,-0.251615,-0.120241

which is R.A. +194.682 Decl. -6.906

missing R.A. +200.824 Decl. -8.734 (ibex-sun)

error is R.A. +6.142 Decl.+1.828

for a total 6.354 deg

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 424 apogee:

ibex_rotate -o -u -0.93651,-0.317939,-0.147861 -w ibex-sun -t 2018/10:16:06:48:45

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.936510,-0.317939,-0.147861

which is R.A. +198.752 Decl. -8.503

missing R.A. +200.928 Decl. -8.779 (ibex-sun)

error is R.A. +2.176 Decl. +0.276

for a total 2.169 deg

ibex_rotate -o -u -0.93651,-0.317939,-0.147861 -w ibex-sun -t 2018-10-21T01:31:17.571Z

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.936510,-0.317939,-0.147861

which is R.A. +198.752 Decl. -8.503

missing R.A. +205.282 Decl. -10.496 (ibex-sun)

error is R.A. +6.530 Decl. +1.993

for a total 6.742 deg

No Lo O-mode.

There is no overlap with orbit 422 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken

On September 25, 2018 at 10:41 AM "Perry, Timothy" <Timothy.Perry@OrbitalATK.com> wrote:

All,
   Attached are the planning files for Orbit #423.
Please respond to this thread with comments and approvals.
Approvals are required by COB 27 Sept 18.

Note the following:
1.    Battery Balancing
# Orbit# 423 PERIGEE Battery Balancing
# 2018-10-16T15:54:21.674Z,Perigee,orbit:423
  @ECT_SetLongEclipseFlag TRUE $TIME=2018/10:16:15:00:00
@ECT_SetLongEclipseFlag FALSE $TIME=2018/10:16:16:30:00

2.    The second LAHO pass will be in the Orbit #424 ATS. The contact is at 17Re @10/17/18 05:00:00z.

3.    IBEX_2018_280_o0423a_v001_.ccvr

#   IBEX_2018_280_o0423a_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 2018/10/08 05:15:27 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
             transition to science mode at 2018/10/11 21:27:46 UTC

==============
OTHER MESSAGES
==============
NO MESSAGES.

Timothy E. Perry
CRS, IBEX, OCO-2 & TESS
Mission Operations
Tim.perry@ngc.com
Office (703) 406-5976
Cell (301) 606-1430

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Thank you.
*********************