I have looked at the orbit 488 ATS files,

IBEX_2020_140_o0488a_BUS_v001.scr

and

IBEX_2020_140_o0488a_INST_v001.scr,

and I approve.

The only constraint violations in

IBEX_2020_140_o0488a_BUS_v001.ccvr

and

IBEX_2020_140_o0488a_INST_v001.ccvr

are from the removal of the

ACT_SetSpinPulseProtectEnable Enable

commands (2); the violations are expected.

The PL commands in

IBEX_2020_140_o0488a_INST_v001.scr

match those in the v002 STF,

IBEX_2020_140_o0488a_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_140_o0488a_BUS_v001.oef,

and as verified with ibex_orbit.

There is one star tracker outage. The outage starts ~1.5 hours after 15 Re descending (delaying the maneuver) and runs for about 8 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_Orbit488_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 inertial pointing maneuver at perigee of orbit 487 left us pointing in safe directions for the orbit 488 arc A ascending and descending sequences:

ibex_rotate -o -u 0.551173,0.769104,0.323554 -w ibex-sun -t 2020/05:20:00:43:10

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.551173,+0.769104,+0.323554

which is R.A. +54.373 Decl. +18.878

missing R.A. +56.959 Decl. +19.949 (ibex-sun)

error is R.A. +2.586 Decl. +1.071

for a total 2.664 deg

ibex_rotate -o -u 0.551173,0.769104,0.323554 -w ibex-sun -t 2020/05:23:15:28:52

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.551173,+0.769104,+0.323554

which is R.A. +54.373 Decl. +18.878

missing R.A. +60.671 Decl. +20.703 (ibex-sun)

error is R.A. +6.298 Decl. +1.825

for a total 6.200 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 0.487235,0.805187,0.338048 -w ibex-sun -t 2020/05:23:17:12:00

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.487235,+0.805187,+0.338048

which is R.A. +58.821 Decl. +19.758

missing R.A. +60.744 Decl. +20.718 (ibex-sun)

error is R.A. +1.923 Decl. +0.960

for a total 2.044 deg

ibex_rotate -o -u 0.487235,0.805187,0.338048 -w ibex-sun -t 2020/05:23:18:47:06

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.487235,+0.805187,+0.338048

which is R.A. +58.821 Decl. +19.758

missing R.A. +60.812 Decl. +20.732 (ibex-sun)

error is R.A. +1.991 Decl. +0.974

for a total 2.106 deg

ibex_rotate -o -u 0.487235,0.805187,0.338048 -w ibex-sun -t 2020/05:28:04:12:52

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.487235,+0.805187,+0.338048

which is R.A. +58.821 Decl. +19.758

missing R.A. +65.217 Decl. +21.503 (ibex-sun)

error is R.A. +6.396 Decl. +1.745

for a total 6.234 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 489 apogee:

ibex_rotate -o -u 0.418853,0.836686,0.352871 -w ibex-sun -t 2020/05:28:14:38:40

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.418853,+0.836686,+0.352871

which is R.A. +63.407 Decl. +20.663

missing R.A. +65.632 Decl. +21.546 (ibex-sun)

error is R.A. +2.225 Decl. +0.883

for a total 2.255 deg

ibex_rotate -o -u 0.418853,0.836686,0.352871 -w ibex-sun -t 2020-06-02T01:52:33.827Z

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.418853,+0.836686,+0.352871

which is R.A. +63.407 Decl. +20.663

missing R.A. +70.258 Decl. +22.205 (ibex-sun)

error is R.A. +6.851 Decl. +1.542

for a total 6.560 deg

No Lo O-mode.

There is no overlap with orbit 487 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken

All,

Attached are the planning files for Orbit #488

Please respond to this thread with comments and approvals.

Approvals are required by COB on 22 April 2020

Please note the following:

I generated 3 separate ATS files BUS, INST and a complete file. The BUS and INST will be the files to be uplinked. The complete ATS, I used as a sanity check to see how the commands lined up. Since we are in a new phase of ATS generation. IF you have any ideas of doing this differently, let me know.

The 3 ATS files have been changed to word docx files and encrypted. I will send out another email with the password. The files that have been transferred via MFT have not been encrypted and are still text files.

I moved the 2 House Keeping commands from the INST ATS to the BUS ATS. I commented out the 2 commands in the INST ATS. If for some reason we were unable to uplink the INST Commands for this orbit, we would have been in the wrong spacecraft state for executing the maneuver commands.

The contact list has both Orbit# 486 and 488 contacts listed to help with checking the ATS.

Master Timer Command for Orbit #486

# Orbit# 486 Reset Master Timer

@EMR_StrobeMReset $TIME=2020/05:11:01:15:00

Battery Balancing

The perigee Inertial maneuver executed @ 2020/05:28:14:28:40 and commands were finished @ 2020/05:28:14:54:40. The battery balancing was moved 16:00gmt.

# Orbit 488 Battery Balancing

# 2020-05-28T15:03:11.459Z,Perigee,orbit:488

@ECT_SetLongEclipseFlag TRUE $TIME=2020/05:28:16:00:00

@ECT_SetLongEclipseFlag FALSE $TIME=2020/05:28:17:30:00

7. Command Load Constraint Violation Report (CCVR)

IBEX_2020_140_o0488a_v001.ccvr

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

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 2020/05/19 22:27:28 UTC

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

transition to science mode at 2020/05/23 18:17:06 UTC

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

OTHER MESSAGES

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

NO MESSAGES.

Timothy E.Perry

CRS IBEX OCO-2

Mission Operations

timothy.perry@ngc.com

Office (703) 406-5976

Cell (301) 606-1430