Hi all,

I have looked at the orbit 0536 ATS file, IBEX_2021_212_o0536a_v001.scr and I approve.

The constraint violations in IBEX_2021_212_o0536a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands and the two transmissions on 2021-08-09 position relative to each other. The violations are acceptable.

The PL commands in IBEX_2021_212_o0536a_v001.scr match those in the STF, IBEX_2021_212_o0536a_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_2021_212_o0536a_v001.oef and as verified with ibex_orbit.

There is 1 star tracker outage this orbit. It begins shortly after the perigee maneuver and lasts for ~1 hour.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit536_Contacts.txt for all contacts (4).

There is battery balancing this orbit and it is appropriately placed from instrument commands and maneuvers.

The Inertial maneuver at perigee of orbit 0535 left us pointing in safe directions for the orbit 0536 arc A ascending and descending sequences, although it is a bit high:

ibex_rotate -o -u -0.521706,0.78666,0.330136 -w ibex-sun -t 2021/07:31:19:22:40

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.521706,+0.786660,+0.330136

which is R.A. +123.552 Decl. +19.277

missing R.A. +130.915 Decl. +18.118 (ibex-sun)

error is R.A. +7.363 Decl. +1.159

for a total 7.069 deg

ibex_rotate -o -u -0.521706,0.78666,0.330136 -w ibex-sun -t 2021/08:04:11:44:56

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.521706,+0.786660,+0.330136

which is R.A. +123.552 Decl. +19.277

missing R.A. +134.410 Decl. +17.214 (ibex-sun)

error is R.A. +10.858 Decl. +2.063

for a total 10.514 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 -0.644305,0.705579,0.295008 -w ibex-sun -t 2021/08:04:13:28:04

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.644305,+0.705579,+0.295008

which is R.A. +132.401 Decl. +17.158

missing R.A. +134.480 Decl. +17.195 (ibex-sun)

error is R.A. +2.079 Decl. +0.037

for a total 1.986 deg

ibex_rotate -o -u -0.644305,0.705579,0.295008 -w ibex-sun -t 2021/08:04:15:03:10

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.644305,+0.705579,+0.295008

which is R.A. +132.401 Decl. +17.158

missing R.A. +134.544 Decl. +17.178 (ibex-sun)

error is R.A. +2.143 Decl. +0.020

for a total 2.048 deg

ibex_rotate -o -u -0.644305,0.705579,0.295008 -w ibex-sun -t 2021/08:09:03:42:37

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.644305,+0.705579,+0.295008

which is R.A. +132.401 Decl. +17.158

missing R.A. +138.993 Decl. +15.891 (ibex-sun)

error is R.A. +6.592 Decl. +1.267

for a total 6.445 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0537 apogee:

ibex_rotate -o -u -0.701673,0.657234,0.275134 -w ibex-sun -t 2021/08:09:07:17:43

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.701673,+0.657234,+0.275134

which is R.A. +136.873 Decl. +15.970

missing R.A. +139.131 Decl. +15.843 (ibex-sun)

error is R.A. +2.258 Decl. +0.127

for a total 2.175 deg

ibex_rotate -o -u -0.701673,0.657234,0.275134 -w ibex-sun -t 2021-08-14T00:31:06

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.701673,+0.657234,+0.275134

which is R.A. +136.873 Decl. +15.970

missing R.A. +143.477 Decl. +14.481 (ibex-sun)

error is R.A. +6.604 Decl. +1.489

for a total 6.543 deg

The set science state commands overlap with a contact in the orbit 0535 commands, but this is acceptable.

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: Tuesday, 2021-July-20 at 16:47
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>, fair-play@comcast.net <fair-play@comcast.net>, 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 #536 ATS Approval (31 July – 09 Aug, 2021)

Caution - External Email

All,

Attached are the planning files for Orbit #536. Please respond to this thread with comments and approvals. Sorry for the late delivery of the orbit 536 planning products. We had some license issues with our STK. Approvals are requested by 21:00, 21 July 2021.

Note: We do have a couple more contacts before the start of Orbit 536, If you are unable to get the approvals done by tomorrow afternoon.

Please note the following:

Battery Balancing this orbit

Begin 2021/08:09:13:00:00 – End 2021/08:09:14:30:00

APL Contact 2021-08-09 15:00:00 - 2021-08-09 16:00:00

Just a reminder for the APL contact. We start off at 2k D\L, after 5 minutes we switch to 320k D\L, Then 5 minutes later we start the SSR Dump with Dump New command

Command Load Constraint Violation Report (CCVR)

IBEX_2021_212_o0536a_v001.ccvr

# Input files: 1

# IBEX_2021_212_o0536a_v001.scr

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

HARD CONSTRAINT VIOLATIONS

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

NO VIOLATIONS.

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

SOFT CONSTRAINT VIOLATIONS

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

These 2 IBX-CLC-006 Soft Violations are acceptable. The reason for these violations are because of the 2 following contacts:

IBEX,APL-18,ADD,2021-08-09,221,15:00:00,2021-08-09,221,16:00:00,, LAHO 2K-320k APL Orbit# 536 SSR_Dump Contact 14 Per

IBEX,USHI01,ADD,08/09/21,221,19:00:00,08/09/21,221,20:00:00,LAHO 2K IBEX-2 Orbit# 536 Tracking Contact 14 Asc

IBX-CLC-006: Planned transmission at 2021/08/09 14:58:00 UTC - 2021/08/09

16:02:00 UTC is followed 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 7680.000 seconds)

IBX-CLC-006: Planned transmission at 2021/08/09 18:58:00 UTC - 2021/08/09

20:02:00 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 7680.000 seconds.

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

transition to science mode at 2021/07/31 16:43:51 UTC

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

transition to science mode at 2021/08/04 14:33:10 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