Note: Angle at descending after the apogee sun precession maneuver: 3.900 deg

IBEX_2023_018_o0595a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2023_018_o0595a_v001.ccvr

are from the removal of the

ACT_SetSpinPulseProtectEnable Enable

commands (2); the violations are expected.

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_2023_018_o0595a_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_Orbit595_Contacts.txt,

for all contacts (4).

We are doing battery cell balancing (bonus for this orbit) and the balancing commands are correct and offset by enough time from other commands.

The inertial precession maneuver at perigee of orbit 594 leaves us pointing in safe directions for the orbit 595 arc A ascending and descending sequences:

ibex_rotate -o -u 0.486197,-0.797708,-0.356754 -w ibex-sun -t 2023/01:19:02:14:53

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  +0.486197,-0.797708,-0.356754

 which is     R.A. +301.362 Decl. -20.901

 missing      R.A. +300.534 Decl. -20.496 (ibex-sun)

 error is     R.A.   +0.828 Decl.  +0.405

 for a total  0.874 deg

ibex_rotate -o -u 0.486197,-0.797708,-0.356754 -w ibex-sun -t 2023/01:22:23:11:46

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  +0.486197,-0.797708,-0.356754

 which is     R.A. +301.362 Decl. -20.901

 missing      R.A. +304.701 Decl. -19.601 (ibex-sun)

 error is     R.A.   +3.339 Decl.  +1.300

 for a total  3.391 deg

The sun precession maneuver at apogee leaves us pointing in safe directions at the time of the maneuver and for the arc B ascending and descending sequences:

ibex_rotate -o -r +304.779 -d -19.583 -w ibex-sun -t 2023/01:23:00:59:54

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  +0.537418,-0.773848,-0.335172

 which is     R.A. +304.779 Decl. -19.583

 missing      R.A. +304.779 Decl. -19.583 (ibex-sun)

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

 for a total  0.001 deg

ibex_rotate -o -r +304.779 -d -19.583 -w ibex-sun -t 2023/01:23:02:30:00

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  +0.537418,-0.773848,-0.335172

 which is     R.A. +304.779 Decl. -19.583

 missing      R.A. +304.843 Decl. -19.568 (ibex-sun)

 error is     R.A.   +0.064 Decl.  +0.015

 for a total  0.062 deg

ibex_rotate -o -r +304.779 -d -19.583 -w ibex-sun -t 2023/01:26:23:47:40

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  +0.537418,-0.773848,-0.335172

 which is     R.A. +304.779 Decl. -19.583

 missing      R.A. +308.788 Decl. -18.653 (ibex-sun)

 error is     R.A.   +4.009 Decl.  +0.930

 for a total  3.900 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 596 apogee:

ibex_rotate -o -u 0.616646,-0.718234,-0.322315 -w ibex-sun -t 2023/01:27:02:31:32

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  +0.616646,-0.718234,-0.322315

 which is     R.A. +310.648 Decl. -18.803

 missing      R.A. +308.906 Decl. -18.629 (ibex-sun)

 error is     R.A.   +1.742 Decl.  +0.174

 for a total  1.659 deg

ibex_rotate -o -u 0.616646,-0.718234,-0.322315 -w ibex-sun -t 2023-01-31T22:39:45.542Z

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  +0.616646,-0.718234,-0.322315

 which is     R.A. +310.648 Decl. -18.803

 missing      R.A. +314.021 Decl. -17.297 (ibex-sun)

 error is     R.A.   +3.373 Decl.  +1.506

 for a total  3.543 deg

Lo Normal mode for the entire orbit.

There is no overlap with orbit 594 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken