All,

I have looked at the orbit 607 ATS,

IBEX_2023_127_o0607a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2023_127_o0607a_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_127_o0607a_v001.oef,

and as verified with ibex_orbit.

There is one star tracker outage. The outage starts about 6.5 hours before perigee and runs for about 8.5 hours. No despinning should 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_Orbit607_Contacts.txt,

for all contacts (3).

We are not doing battery cell balancing; we'll do it again in the next orbit.

The inertial precession maneuver at perigee of orbit 606 leaves us pointing in safe directions for the orbit 607 arc A ascending and descending sequences:

ibex_rotate -o -u 0.722412,0.637946,0.266734 -w ibex-sun -t 2023/05:07:13:50:57

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.722412,+0.637946,+0.266734

which is R.A. +41.447 Decl. +15.470

missing R.A. +43.946 Decl. +16.722 (ibex-sun)

error is R.A. +2.499 Decl. +1.252

for a total 2.708 deg

ibex_rotate -o -u 0.722412,0.637946,0.266734 -w ibex-sun -t 2023/05:11:05:53:16

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.722412,+0.637946,+0.266734

which is R.A. +41.447 Decl. +15.470

missing R.A. +47.558 Decl. +17.747 (ibex-sun)

error is R.A. +6.111 Decl. +2.277

for a total 6.283 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 0.667656,0.686949,0.286943 -w ibex-sun -t 2023/05:11:07:36:24

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.667656,+0.686949,+0.286943

which is R.A. +45.816 Decl. +16.675

missing R.A. +47.630 Decl. +17.767 (ibex-sun)

error is R.A. +1.814 Decl. +1.092

for a total 2.048 deg

ibex_rotate -o -u 0.667656,0.686949,0.286943 -w ibex-sun -t 2023/05:11:09:11:30

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.667656,+0.686949,+0.286943

which is R.A. +45.816 Decl. +16.675

missing R.A. +47.695 Decl. +17.785 (ibex-sun)

error is R.A. +1.879 Decl. +1.110

for a total 2.110 deg

ibex_rotate -o -u 0.667656,0.686949,0.286943 -w ibex-sun -t 2023/05:15:20:49:48

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.667656,+0.686949,+0.286943

which is R.A. +45.816 Decl. +16.675

missing R.A. +52.108 Decl. +18.902 (ibex-sun)

error is R.A. +6.292 Decl. +2.227

for a total 6.391 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 608 apogee:

ibex_rotate -o -u 0.606895,0.732751,0.307822 -w ibex-sun -t 2023/05:15:23:34:22

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.606895,+0.732751,+0.307822

which is R.A. +50.367 Decl. +17.928

missing R.A. +52.215 Decl. +18.923 (ibex-sun)

error is R.A. +1.848 Decl. +0.995

for a total 2.016 deg

ibex_rotate -o -u 0.606895,0.732751,0.307822 -w ibex-sun -t 2023-05-21T00:51:39.504Z

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.606895,+0.732751,+0.307822

which is R.A. +50.367 Decl. +17.928

missing R.A. +57.235 Decl. +20.043 (ibex-sun)

error is R.A. +6.868 Decl. +2.115

for a total 6.829 deg

Lo Normal mode for the entire orbit.

There is no overlap with orbit 606 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken

On Mon, Apr 24, 2023 at 11:22 AM Perry, Timothy E [US] (SP) <Timothy.Perry@ngc.com> wrote:

All,

   Attached are the planning files for Orbit #607 Please respond to this thread with comments and approvals.

Approvals are required by COB, 26 Apr 2023



Please note the following:

1.       No Battery Balancing this orbit

2.       Command Load Constraint Violation Report (CCVR)

IBEX_2023_127_o0607a_v001.ccvr

# Input files:         1

#   IBEX_2023_127_o0607a_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 2023/05/07 11:52:02 UTC

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

             transition to science mode at 2023/05/11 08:41:30 UTC

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

OTHER MESSAGES

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

NO MESSAGES.