All,

I have looked at the orbit 672 ATS,

IBEX_2024_354_o0672a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2024_354_o0672a_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_2024_354_o0672a_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_2024_354_o0672a_v001.oef,

and as verified with ibex_orbit.

There is one star tracker outage. The outage starts about 1 1/2 days after apogee and runs for 2- days. Some despinning may be required due to this outage.

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

IBEX_Orbit672_Contacts.txt,

for all contacts (3).

We are doing battery cell balancing and the balancing commands are correct and offset by enough time from other commands.

The inertial precession maneuver at perigee of orbit 671 leaves us pointing in safe directions for the orbit 672 arc A ascending and descending sequences:

ibex_rotate -o -u -0.01443,-0.91346,-0.406673 -w ibex-sun -t 2024/12:20:05:57:49

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.014430,-0.913460,-0.406673

which is R.A. +269.095 Decl. -23.996

missing R.A. +268.399 Decl. -23.443 (ibex-sun)

error is R.A. +0.696 Decl. +0.553

for a total 0.844 deg

ibex_rotate -o -u -0.01443,-0.91346,-0.406673 -w ibex-sun -t 2024/12:23:18:37:47

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.014430,-0.913460,-0.406673

which is R.A. +269.095 Decl. -23.996

missing R.A. +272.354 Decl. -23.395 (ibex-sun)

error is R.A. +3.259 Decl. +0.601

for a total 3.044 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 0.065336,-0.911931,-0.40511 -w ibex-sun -t 2024/12:23:20:20:55

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.065336,-0.911931,-0.405110

which is R.A. +274.098 Decl. -23.898

missing R.A. +272.433 Decl. -23.393 (ibex-sun)

error is R.A. +1.665 Decl. +0.505

for a total 1.607 deg

ibex_rotate -o -u 0.065336,-0.911931,-0.40511 -w ibex-sun -t 2024/12:23:21:56:01

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.065336,-0.911931,-0.405110

which is R.A. +274.098 Decl. -23.898

missing R.A. +272.505 Decl. -23.392 (ibex-sun)

error is R.A. +1.593 Decl. +0.506

for a total 1.544 deg

ibex_rotate -o -u 0.065336,-0.911931,-0.40511 -w ibex-sun -t 2024/12:28:05:42:55

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.065336,-0.911931,-0.405110

which is R.A. +274.098 Decl. -23.898

missing R.A. +277.197 Decl. -23.254 (ibex-sun)

error is R.A. +3.099 Decl. +0.644

for a total 2.912 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 673 apogee:

ibex_rotate -o -u 0.14467,-0.903913,-0.402507 -w ibex-sun -t 2024/12:28:07:37:49

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.144670,-0.903913,-0.402507

which is R.A. +279.093 Decl. -23.735

missing R.A. +277.284 Decl. -23.252 (ibex-sun)

error is R.A. +1.809 Decl. +0.483

for a total 1.728 deg

ibex_rotate -o -u 0.14467,-0.903913,-0.402507 -w ibex-sun -t 2025-01-02T03:26:08.526Z

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.144670,-0.903913,-0.402507

which is R.A. +279.093 Decl. -23.735

missing R.A. +282.733 Decl. -22.892 (ibex-sun)

error is R.A. +3.640 Decl. +0.843

for a total 3.447 deg

Lo Normal mode for the entire orbit.

There is no overlap with orbit 671 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken

On Fri, Dec 6, 2024 at 11:00 AM Perry, Timothy E [US] (SP) <Timothy.Perry@ngc.com> wrote:

All,

   Attached are the planning files for Orbit #672. Please respond to this thread with comments and approvals. Approvals for the Orbit 672 ATS are required by COB, 09 December 2024.

Please note the following:

1.        Battery Balancing

Eclipse Flag True: 2024/12:28:17:00:00

Eclipse Flag False: 2024/12:28:18:30:00

2.        Command Load Constraint Violation Report (CCVR)

IBEX_2024_354_o0672a_v001.ccvr

# Input files:         1

#   IBEX_2024_354_o0672a_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 2024/12/20 04:45:01 UTC

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

             transition to science mode at 2024/12/23 21:26:01 UTC

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

OTHER MESSAGES

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

NO MESSAGES.

Timothy E.Perry

CRS IBEX OCO-2

Mission Operations

timothy.perry@ngc.com

Office (703) 406-5976

IBEX MOC (703)404-7470

Cell (301) 606-1430