Hi all,

I have looked at the orbit 0645 ATS file, IBEX_2024_108_o0645a_v001.scr and I approve.

The constraint violations in IBEX_2024_108_o0645a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands, having continuous transmitter on during the eclipse rehersal, and the battery wattage dropping for the eclipse rehersal. The violations are acceptable.

The PL commands in IBEX_2024_108_o0645a_v001.scr match those in the STF, IBEX_2024_108_o0645a_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_2024_108_o0645a_v001.oef and as verified with ibex_orbit.

There are 2 star tracker outages this orbit. Outage begins at 2024-04-24 22:34:32 and lasts for 35.3 hours. Outage begins at 2024-04-26 16:19:57 and lasts for 6.6 hours.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit645_Contacts.txt for all contacts (6).

No Battery Balancing this orbit.

The Inertial maneuver at perigee of orbit 0644 left us pointing in safe directions for the orbit 0645 arc A ascending and descending sequences:

ibex_rotate -o -u 0.900853,0.401802,0.164376 -w ibex-sun -t 2024/04:18:08:37:32

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.900853,+0.401802,+0.164376

which is R.A. +24.038 Decl. +9.461

missing R.A. +26.433 Decl. +10.901 (ibex-sun)

error is R.A. +2.395 Decl. +1.440

for a total 2.762 deg

ibex_rotate -o -u 0.900853,0.401802,0.164376 -w ibex-sun -t 2024/04:21:22:52:45

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.900853,+0.401802,+0.164376

which is R.A. +24.038 Decl. +9.461

missing R.A. +29.843 Decl. +12.187 (ibex-sun)

error is R.A. +5.805 Decl. +2.726

for a total 6.319 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 0.865027,0.464154,0.190501 -w ibex-sun -t 2024/04:22:00:35:53

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.865026,+0.464154,+0.190501

which is R.A. +28.217 Decl. +10.982

missing R.A. +29.911 Decl. +12.212 (ibex-sun)

error is R.A. +1.694 Decl. +1.230

for a total 2.065 deg

ibex_rotate -o -u 0.865027,0.464154,0.190501 -w ibex-sun -t 2024/04:22:02:10:59

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.865026,+0.464154,+0.190501

which is R.A. +28.217 Decl. +10.982

missing R.A. +29.973 Decl. +12.235 (ibex-sun)

error is R.A. +1.756 Decl. +1.253

for a total 2.128 deg

ibex_rotate -o -u 0.865027,0.464154,0.190501 -w ibex-sun -t 2024/04:26:10:21:31

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.865026,+0.464154,+0.190501

which is R.A. +28.217 Decl. +10.982

missing R.A. +34.042 Decl. +13.660 (ibex-sun)

error is R.A. +5.825 Decl. +2.678

for a total 6.289 deg

The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0646 apogee:

ibex_rotate -o -u 0.823456,0.524094,0.21736 -w ibex-sun -t 2024/04:26:13:48:09

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.823456,+0.524094,+0.217360

which is R.A. +32.475 Decl. +12.554

missing R.A. +34.170 Decl. +13.698 (ibex-sun)

error is R.A. +1.695 Decl. +1.144

for a total 2.009 deg

ibex_rotate -o -u 0.823456,0.524094,0.21736 -w ibex-sun -t 2024-05-01T09:55:22

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.823456,+0.524094,+0.217360

which is R.A. +32.475 Decl. +12.554

missing R.A. +38.781 Decl. +15.210 (ibex-sun)

error is R.A. +6.306 Decl. +2.656

for a total 6.673 deg

There is no overlap with orbit 0644 commands.

Command Approval Checklist is attached.

Carol

Carol Weaver

University of New Hampshire

503-902-8492

From: Perry, Timothy E [US] (SP) <Timothy.Perry@ngc.com>
Date: Wednesday, April 3, 2024 at 15:17
To: Carol Weaver <carol.weaver@unh.edu>, Chubin, Eric [US] (SP) <Eric.Chubin@ngc.com>, David Heirtzler <David.Heirtzler@unh.edu>, ADS-IBEX@l3harris.com <ADS-IBEX@l3harris.com>, IBEXOPS@gmail.com <IBEXOPS@gmail.com>, isocops@lists.sr.unh.edu <isocops@lists.sr.unh.edu>, kwfairchild@gmail.com <kwfairchild@gmail.com>, Kenneth Fairchild <Ken.Fairchild@unh.edu>, angoldconsulting@earthlink.net <angoldconsulting@earthlink.net>, Paul.Janzen@mso.umt.edu <Paul.Janzen@mso.umt.edu>, Perry, Timothy E [US] (SP) <Timothy.Perry@ngc.com>, Tyler, Ryan S [US] (SP) <Ryan.Tyler@ngc.com>, Wesley, Sheral R [US] (SP) <Sheral.Wesley@ngc.com>, Wynn, Reese [US] (SP) <Reese.Wynn@ngc.com>
Subject: IBEX Orbit #645 ATS Approval (April 18 - 27, 2024) Both Orbit 645 and Pre-Eclipse

CAUTION: This email originated from outside of the University System. Do not click links or open attachments unless you recognize the sender and know the content is safe.

All,

Attached are the planning files for Orbit #645. Please respond to this thread with comments and approvals. Approvals for the Orbit 645 ATS are required by COB, 07 April 2024.

Approvals for the Pre-Eclipse ATS are required by COB 16 April 2024.

Please note the following:

Battery Balancing

Since we are setting the eclipse Flag for the upcoming eclipse rehearsal, I didn’t see the need to add balancing commands at perigee.

Eclipse Flag True: 2024/04/17 20:00:00

Eclipse Flag False: 2024/04/17 21:30:00

Command Load Constraint Violation Report (CCVR)

IBEX_2024_108_o0645a_v001.ccvr

# Input files: 1

# IBEX_2024_108_o0645a_v001.scr

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

HARD CONSTRAINT VIOLATIONS

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

NO VIOLATIONS.

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

SOFT CONSTRAINT VIOLATIONS

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

The IBX-CLC-006 violations are expected since we have the long duration contacts planned on the 19^th and 20^th.

The IBX-CLC-015 Violation is flagging due to the long transmitter times. Why it starts so early and ends on the 22^nd I’m not sure. I think the long transmitter durations are throwing off the power model. I checked the MPS timeline, and it does show valid power after 2024/04/22 05:48:11. But, from past experience we should be power positive for the duration.

IBX-CLC-006: Planned transmission at 2024/04/19 11:58:00 UTC - 2024/04/19

14:58:00 UTC exceeds the maximum contiguous transmission time of

5400 seconds

IBX-CLC-006: Planned transmission at 2024/04/19 14:58:00 UTC - 2024/04/19

15:02:00 UTC is preceded by one or more additional transmissions

which, when combined, exceed the maximum transmission time of 5400

seconds within a 18000-second window (total planned transmission

time this window is 11040.000 seconds)

IBX-CLC-006: Planned transmission at 2024/04/20 05:28:00 UTC - 2024/04/20

15:02:00 UTC exceeds the maximum contiguous transmission time of

5400 seconds

IBX-CLC-015: Battery charge falls below minimum from 2024/04/17 13:48:39 UTC -

2024/04/22 05:48:11 UTC. Lowest charge level is 0.000000

watt-minutes during this interval.

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

transition to science mode at 2024/04/18 07:08:06 UTC

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

transition to science mode at 2024/04/22 01:40:59 UTC

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

OTHER MESSAGES

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

NO MESSAGES.

Timothy E.Perry

CRS IBEX OCO-2

Mission Operations

timothy.perry@ngc.com

Office (703) 406-5976

IBEX MOC (703)404-7470

Cell (301) 606-1430