All,

I have looked at the orbit 613 ATS,

IBEX_2023_182_o0613a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2023_182_o0613a_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_182_o0613a_v001.oef,

and as verified with ibex_orbit.

There are two star tracker outages. The first starts at orbit 612 perigee and runs for 1- days. The second starts 2+ hours after perigee and runs for about 4.5 hours. Some despinning may be required due to the first outage.

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

IBEX_Orbit613_Contacts.txt,

for all contacts (4).

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 612 leaves us pointing in safe directions for the orbit 613 arc A ascending and descending sequences:

ibex_rotate -o -u -0.122107,0.914177,0.386486 -w ibex-sun -t 2023/07:02:04:01:30

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.122107,+0.914176,+0.386486

which is R.A. +97.608 Decl. +22.736

missing R.A. +100.569 Decl. +23.061 (ibex-sun)

error is R.A. +2.961 Decl. +0.325

for a total 2.747 deg

ibex_rotate -o -u -0.122107,0.914177,0.386486 -w ibex-sun -t 2023/07:05:18:21:54

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.122107,+0.914176,+0.386486

which is R.A. +97.608 Decl. +22.736

missing R.A. +104.225 Decl. +22.802 (ibex-sun)

error is R.A. +6.617 Decl. +0.066

for a total 6.101 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 -0.195323,0.903712,0.38099 -w ibex-sun -t 2023/07:05:20:05:02

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.195323,+0.903712,+0.380990

which is R.A. +102.196 Decl. +22.395

missing R.A. +104.299 Decl. +22.796 (ibex-sun)

error is R.A. +2.103 Decl. +0.401

for a total 1.983 deg

ibex_rotate -o -u -0.195323,0.903712,0.38099 -w ibex-sun -t 2023/07:05:21:40:08

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.195323,+0.903712,+0.380990

which is R.A. +102.196 Decl. +22.395

missing R.A. +104.368 Decl. +22.791 (ibex-sun)

error is R.A. +2.172 Decl. +0.396

for a total 2.044 deg

ibex_rotate -o -u -0.195323,0.903712,0.38099 -w ibex-sun -t 2023/07:10:08:04:12

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.195323,+0.903712,+0.380990

which is R.A. +102.196 Decl. +22.395

missing R.A. +109.027 Decl. +22.300 (ibex-sun)

error is R.A. +6.831 Decl. +0.095

for a total 6.318 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 614 apogee:

ibex_rotate -o -u -0.270005,0.886965,0.374688 -w ibex-sun -t 2023/07:10:10:41:34

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.270005,+0.886965,+0.374688

which is R.A. +106.931 Decl. +22.005

missing R.A. +109.137 Decl. +22.282 (ibex-sun)

error is R.A. +2.206 Decl. +0.277

for a total 2.062 deg

ibex_rotate -o -u -0.270005,0.886965,0.374688 -w ibex-sun -t 2023-07-15T09:55:17.018Z

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.270005,+0.886965,+0.374688

which is R.A. +106.931 Decl. +22.005

missing R.A. +114.074 Decl. +21.610 (ibex-sun)

error is R.A. +7.143 Decl. +0.395

for a total 6.643 deg

Lo Normal mode for the entire orbit.

There is no overlap with orbit 612 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken

On Mon, Jun 19, 2023 at 12:01 PM Perry, Timothy E [US] (SP) <Timothy.Perry@ngc.com> wrote:

All,

   Attached are the planning files for Orbit #613. Please respond to this thread with comments and approvals. Approvals are required by 1700, 21 June 2023

Please note the following:

1.        Battery Balancing this Orbit.

Begin 2023/07/10 19:00:00 – End 2023/07/10 20:30:00

2.        Command Load Constraint Violation Report (CCVR)

IBEX_2023_182_o0613a_v001.ccvr

# Input files:         1

#   IBEX_2023_182_o0613a_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 2023/07/02 02:08:26 UTC

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

             transition to science mode at 2023/07/05 21:10:08 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