All,

Note: Angle at orbit 434 arc B descending after the apogee sun precession maneuver: 4.177 deg

I have looked at the orbit 434 ATS,

IBEX_2019_014_o0434a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2019_014_o0434a_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_2019_014_o0434a_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_2019_014_o0434a_v001.oef,

and as verified with ibex_orbit.

There are two star tracker outages; they overlap. The first outage starts 1.5 days before apogee. The total outage time is about 4.5 days. Some despinning may be required due to the outages.

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

IBEX_Orbit434_Contacts.txt,

for all contacts (3).

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 433 left us pointing in safe directions for the orbit 434 arc A ascending and descending sequences:

ibex_rotate -o -u 0.417363,-0.829655,-0.370784 -w ibex-sun -t 2019/01:14:17:15:32

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.417363,-0.829655,-0.370784

which is R.A. +296.705 Decl. -21.764

missing R.A. +295.904 Decl. -21.327 (ibex-sun)

error is R.A. +0.801 Decl. +0.437

for a total 0.864 deg

ibex_rotate -o -u 0.417363,-0.829655,-0.370784 -w ibex-sun -t 2019/01:18:19:48:53

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.417363,-0.829655,-0.370784

which is R.A. +296.705 Decl. -21.764

missing R.A. +300.291 Decl. -20.525 (ibex-sun)

error is R.A. +3.586 Decl. +1.239

for a total 3.567 deg

The sun 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 -r +300.369 -d -20.508 -w ibex-sun -t 2019/01:18:21:37:01

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.473526,-0.808107,-0.350338

which is R.A. +300.369 Decl. -20.508

missing R.A. +300.369 Decl. -20.508 (ibex-sun)

error is R.A. +0.000 Decl. +0.000

for a total 0.000 deg

ibex_rotate -o -r +300.369 -d -20.508 -w ibex-sun -t 2019/01:18:23:07:07

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.473526,-0.808107,-0.350338

which is R.A. +300.369 Decl. -20.508

missing R.A. +300.435 Decl. -20.495 (ibex-sun)

error is R.A. +0.066 Decl. +0.013

for a total 0.063 deg

ibex_rotate -o -r +300.369 -d -20.508 -w ibex-sun -t 2019/01:23:01:21:23

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.473526,-0.808107,-0.350338

which is R.A. +300.369 Decl. -20.508

missing R.A. +304.707 Decl. -19.589 (ibex-sun)

error is R.A. +4.338 Decl. +0.919

for a total 4.177 deg

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 435 apogee:

ibex_rotate -o -u 0.560826,-0.755511,-0.338639 -w ibex-sun -t 2019/01:23:03:51:16

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.560826,-0.755511,-0.338639

which is R.A. +306.587 Decl. -19.794

missing R.A. +304.821 Decl. -19.569 (ibex-sun)

error is R.A. +1.766 Decl. +0.225

for a total 1.678 deg

ibex_rotate -o -u 0.560826,-0.755511,-0.338639 -w ibex-sun -t 2019-01-28T01:26:20.144Z

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.560826,-0.755511,-0.338639

which is R.A. +306.587 Decl. -19.794

missing R.A. +310.003 Decl. -18.370 (ibex-sun)

error is R.A. +3.416 Decl. +1.424

for a total 3.528 deg

No Lo O-mode.

There is no overlap with orbit 433 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken

On January 2, 2019 at 12:36 PM "Perry, Timothy" <Timothy.Perry@ngc.com> wrote:

All,
   Attached are the planning files for Orbit #434.
Please respond to this thread with comments and approvals.
Approvals are required by 1500 GMT on 04 Jan 2019.

Note the following:
1.    No Battery Balancing

2.    IBEX_2019_014_o0434a_v001_.ccvr
# Input files:         1
#   IBEX_2019_014_o0434a_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 2019/01/14 15:25:15 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
             transition to science mode at 2019/01/18 22:37:07 UTC

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

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

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*********************