Hi all,

I have looked at the orbit 0543 ATS file, IBEX_2021_275_o0543a_v001.scr and I approve.

The constraint violations in IBEX_2021_275_o0543a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2021_275_o0543a_v001.scr match those in the STF, IBEX_2021_275_o0543a_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_275_o0543a_v001.oef and as verified with ibex_orbit.

No star tracker outage this orbit.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit543_Contacts.txt for all contacts (3).

Battery Balancing is 90 minutes long, more than 2 hours away from payload descending macros, and more than 1 hour away from maneuver.

The Inertial maneuver at perigee of orbit 0542 left us pointing in safe directions for the orbit 0543 arc A ascending and descending sequences:

ibex_rotate -o -u -0.993511,-0.100444,-0.053347 -w ibex-sun -t 2021/10:02:14:52:37

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.993511,-0.100444,-0.053347

which is R.A. +185.773 Decl. -3.058

missing R.A. +188.595 Decl. -3.727 (ibex-sun)

error is R.A. +2.822 Decl. +0.669

for a total 2.895 deg

ibex_rotate -o -u -0.993511,-0.100444,-0.053347 -w ibex-sun -t 2021/10:06:04:24:48

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.993511,-0.100444,-0.053347

which is R.A. +185.773 Decl. -3.058

missing R.A. +191.733 Decl. -5.033 (ibex-sun)

error is R.A. +5.960 Decl. +1.975

for a total 6.264 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 -0.98186,-0.169738,-0.084495 -w ibex-sun -t 2021/10:06:06:07:56

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.981860,-0.169738,-0.084495

which is R.A. +189.808 Decl. -4.847

missing R.A. +191.797 Decl. -5.059 (ibex-sun)

error is R.A. +1.989 Decl. +0.212

for a total 1.993 deg

ibex_rotate -o -u -0.98186,-0.169738,-0.084495 -w ibex-sun -t 2021/10:06:07:43:02

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.981860,-0.169738,-0.084495

which is R.A. +189.808 Decl. -4.847

missing R.A. +191.857 Decl. -5.083 (ibex-sun)

error is R.A. +2.049 Decl. +0.236

for a total 2.055 deg

ibex_rotate -o -u -0.98186,-0.169738,-0.084495 -w ibex-sun -t 2021/10:10:16:17:37

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.981860,-0.169738,-0.084495

which is R.A. +189.808 Decl. -4.847

missing R.A. +195.950 Decl. -6.777 (ibex-sun)

error is R.A. +6.142 Decl. +1.930

for a total 6.407 deg

The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0544 apogee:

ibex_rotate -o -u -0.964813,-0.237517,-0.112787 -w ibex-sun -t 2021/10:10:19:40:35

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.964813,-0.237517,-0.112787

which is R.A. +193.830 Decl. -6.476

missing R.A. +196.085 Decl. -6.839 (ibex-sun)

error is R.A. +2.255 Decl. +0.363

for a total 2.269 deg

ibex_rotate -o -u -0.964813,-0.237517,-0.112787 -w ibex-sun -t 2021-10-15T12:57:52

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.964813,-0.237517,-0.112787

which is R.A. +193.830 Decl. -6.476

missing R.A. +200.349 Decl. -8.561 (ibex-sun)

error is R.A. +6.519 Decl. +2.085

for a total 6.791 deg

There is no overlap with orbit 0542 commands.

Command Approval Checklist is attached.

Carol

--

Carol Weaver

University of New Hampshire

503.902.8492

From: NIgel Angold <nangold@princeton.edu>
Date: Tuesday, 2021-September-21 at 22:04
To: Perry, Timothy E [US] (SP) <Timothy.Perry@ngc.com>
Cc: 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>, 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: Re: [Not Virus Scanned] [Isocops] IBEX Orbit #543 ATS Approval (02 - 11 Oct, 2021)

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.

I approve IBEX_2021_275_o0543a_v001.scr

Nigel

All,

   Attached are the planning files for Orbit #543. Please respond to this thread with comments and approvals.

Approvals are required by 16:00, 22 Sept 2021

Please note the following:

Battery Balancing this orbit

Begin 2021/10/11 02:00:00– End 2021/10/11 03:30:00

Command Load Constraint Violation Report (CCVR)

IBEX_2021_275_o0543a_v001.ccvr

# Input files:         1

#   IBEX_2021_275_o0543a_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 2021/10/02 12:05:17 UTC

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

             transition to science mode at 2021/10/06 07:13:02 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
 
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