Hi all,

I have looked at the orbit 0542 ATS file, IBEX_2021_266_o0542a_v001.scr and I approve.

The constraint violations in IBEX_2021_266_o0542a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2021_266_o0542a_v001.scr match those in the STF, IBEX_2021_266_o0542a_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_266_o0542a_v001.oef and as verified with ibex_orbit.

There are no star tracker outages this orbit.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit542_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 Sun maneuver at perigee of orbit 0541 left us pointing in safe directions for the orbit 0542 arc A ascending and descending sequences:

ibex_rotate -o -r +179.897 -d +0.052 -w ibex-sun -t 2021/09:23:14:00:22

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.999998,+0.001798,+0.000908

which is R.A. +179.897 Decl. +0.052

missing R.A. +180.445 Decl. -0.213 (ibex-sun)

error is R.A. +0.548 Decl. +0.265

for a total 0.608 deg

ibex_rotate -o -r +179.897 -d +0.052 -w ibex-sun -t 2021/09:27:05:40:43

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.999998,+0.001798,+0.000908

which is R.A. +179.897 Decl. +0.052

missing R.A. +183.623 Decl. -1.564 (ibex-sun)

error is R.A. +3.726 Decl. +1.616

for a total 4.060 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 -0.999269,-0.029867,-0.023874 -w ibex-sun -t 2021/09:27:07:23:51

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.999269,-0.029867,-0.023874

which is R.A. +181.712 Decl. -1.368

missing R.A. +183.687 Decl. -1.590 (ibex-sun)

error is R.A. +1.975 Decl. +0.222

for a total 1.987 deg

ibex_rotate -o -u -0.999269,-0.029867,-0.023874 -w ibex-sun -t 2021/09:27:08:58:57

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.999269,-0.029867,-0.023874

which is R.A. +181.712 Decl. -1.368

missing R.A. +183.746 Decl. -1.615 (ibex-sun)

error is R.A. +2.034 Decl. +0.247

for a total 2.049 deg

ibex_rotate -o -u -0.999269,-0.029867,-0.023874 -w ibex-sun -t 2021/10:01:19:48:51

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.999269,-0.029867,-0.023874

which is R.A. +181.712 Decl. -1.368

missing R.A. +187.878 Decl. -3.385 (ibex-sun)

error is R.A. +6.166 Decl. +2.017

for a total 6.483 deg

The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0543 apogee:

ibex_rotate -o -u -0.993511,-0.100444,-0.053347 -w ibex-sun -t 2021/10:01:23:23:16

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. +188.018 Decl. -3.451 (ibex-sun)

error is R.A. +2.245 Decl. +0.393

for a total 2.275 deg

[carolweav@ena 0542]$

[carolweav@ena 0542]$ ibex_rotate -o -u -0.993511,-0.100444,-0.053347 -w ibex-sun -t 2021-10-06T15:57:53

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. +192.170 Decl. -5.209 (ibex-sun)

error is R.A. +6.397 Decl. +2.151

for a total 6.733 deg

There is no overlap with orbit 0541 commands.

Command Approval Checklist is attached.

Carol

--

Carol Weaver

University of New Hampshire

503.902.8492

From: NIgel Angold <nangold@princeton.edu>
Date: Monday, 2021-September-13 at 14:46
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 #542 ATS Approval (23 Sept – 02 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_266_o0542a_v001.scr

Nigel

All,

   Attached are the planning files for Orbit #542. Please respond to this thread with comments and approvals.

Approvals are required by 20:00, 13 Sept 2021

Please note the following:

Battery Balancing this orbit

Begin 2021/10/02 05:00:00– End 2021/10/02 06:30:00

Command Load Constraint Violation Report (CCVR)

IBEX_2021_266_o0542a_v001.ccvr

# Input files:         1

#   IBEX_2021_266_o0542a_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 2021/09/23 11:06:37 UTC

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

             transition to science mode at 2021/09/27 08:28:57 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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