IBEX_2020_069_o0480a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2020_069_o0480a_v001.scr

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_2020_069_o0480a_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_2020_069_o0480a_v001.oef,

and as verified with ibex_orbit.

There is one star tracker outage. The outage starts a day before orbit 479 15 Re descending and runs for 6+ 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_Orbit480_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 sun precession maneuver at perigee of orbit 479 left us pointing in safe directions for the orbit 480 arc A ascending and descending sequences:

ibex_rotate -o -r +349.649 -d -4.445 -w ibex-sun -t 2020/03:09:19:15:38

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.980767,-0.179137,-0.077502

which is R.A. +349.649 Decl. -4.445

missing R.A. +350.263 Decl. -4.215 (ibex-sun)

error is R.A. +0.614 Decl. +0.230

for a total 0.654 deg

ibex_rotate -o -r +349.649 -d -4.445 -w ibex-sun -t 2020/03:14:05:48:50

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.980767,-0.179137,-0.077502

which is R.A. +349.649 Decl. -4.445

missing R.A. +354.427 Decl. -2.394 (ibex-sun)

error is R.A. +4.778 Decl. +2.051

for a total 5.192 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 0.992482,-0.108116,-0.057355 -w ibex-sun -t 2020/03:14:07:31:46

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.992482,-0.108116,-0.057355

which is R.A. +353.783 Decl. -3.288

missing R.A. +354.492 Decl. -2.365 (ibex-sun)

error is R.A. +0.709 Decl. +0.923

for a total 1.163 deg

ibex_rotate -o -u 0.992482,-0.108116,-0.057355 -w ibex-sun -t 2020/03:14:09:07:04

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.992482,-0.108116,-0.057355

which is R.A. +353.783 Decl. -3.288

missing R.A. +354.551 Decl. -2.338 (ibex-sun)

error is R.A. +0.768 Decl. +0.950

for a total 1.221 deg

ibex_rotate -o -u 0.992482,-0.108116,-0.057355 -w ibex-sun -t 2020/03:17:22:17:16

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.992482,-0.108116,-0.057355

which is R.A. +353.783 Decl. -3.288

missing R.A. +357.682 Decl. -0.986 (ibex-sun)

error is R.A. +3.899 Decl. +2.302

for a total 4.525 deg

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 481 apogee:

ibex_rotate -o -u 0.997014,-0.066798,-0.038754 -w ibex-sun -t 2020/03:18:01:30:20

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.997014,-0.066798,-0.038754

which is R.A. +356.167 Decl. -2.221

missing R.A. +357.803 Decl. -0.940 (ibex-sun)

error is R.A. +1.636 Decl. +1.281

for a total 2.078 deg

ibex_rotate -o -u 0.997014,-0.066798,-0.038754 -w ibex-sun -t 2020-03-22T18:56:43.047Z

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.997014,-0.066798,-0.038754

which is R.A. +356.167 Decl. -2.221

missing R.A. +2.240 Decl. +0.980 (ibex-sun)

error is R.A. +353.927 Decl. +3.201

for a total 6.864 deg

No Lo O-mode.

There is no overlap with orbit 479 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken