Hi all,

I have looked at the orbit 0537 ATS file, IBEX_2021_221_o0537a_v001.scr and I approve.

The constraint violations in IBEX_2021_221_o0537a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2021_221_o0537a_v001.scr match those in the STF, IBEX_2021_221_o0537a_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_221_o0537a_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_Orbit537_Contacts.txt for all contacts (3).

We are doing battery balancing this orbit and it is of the required length and appropriately placed from maneuvers and macro execution.

The Inertial maneuver at perigee of orbit 0536 left us pointing in safe directions for the orbit 0537 arc A ascending and descending sequences:

ibex_rotate -o -u -0.701673,0.657234,0.275134 -w ibex-sun -t 2021/08:09:22:43:02

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. +139.698 Decl. +15.643 (ibex-sun)

error is R.A. +2.825 Decl. +0.327

for a total 2.738 deg

ibex_rotate -o -u -0.701673,0.657234,0.275134 -w ibex-sun -t 2021/08:13:12:58:01

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. +143.017 Decl. +14.624 (ibex-sun)

error is R.A. +6.144 Decl. +1.346

for a total 6.077 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 -0.752283,0.608383,0.252863 -w ibex-sun -t 2021/08:13:14:41:09

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.752283,+0.608383,+0.252863

which is R.A. +141.037 Decl. +14.647

missing R.A. +143.085 Decl. +14.603 (ibex-sun)

error is R.A. +2.048 Decl. +0.044

for a total 1.982 deg

ibex_rotate -o -u -0.752283,0.608383,0.252863 -w ibex-sun -t 2021/08:13:16:16:15

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.752283,+0.608383,+0.252863

which is R.A. +141.037 Decl. +14.647

missing R.A. +143.148 Decl. +14.583 (ibex-sun)

error is R.A. +2.111 Decl. +0.064

for a total 2.044 deg

ibex_rotate -o -u -0.752283,0.608383,0.252863 -w ibex-sun -t 2021/08:18:02:01:39

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.752283,+0.608383,+0.252863

which is R.A. +141.037 Decl. +14.647

missing R.A. +147.392 Decl. +13.163 (ibex-sun)

error is R.A. +6.355 Decl. +1.484

for a total 6.344 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0538 apogee:

ibex_rotate -o -u -0.79994,0.554091,0.230389 -w ibex-sun -t 2021/08:18:05:25:41

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.799940,+0.554091,+0.230389

which is R.A. +145.291 Decl. +13.320

missing R.A. +147.521 Decl. +13.112 (ibex-sun)

error is R.A. +2.230 Decl. +0.208

for a total 2.181 deg

ibex_rotate -o -u -0.79994,0.554091,0.230389 -w ibex-sun -t 2021-08-22T22:30:07

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.799940,+0.554091,+0.230389

which is R.A. +145.291 Decl. +13.320

missing R.A. +151.761 Decl. +11.605 (ibex-sun)

error is R.A. +6.470 Decl. +1.715

for a total 6.545 deg

There is an overlap with orbit 536 commands where the ending of the prior contact and setting the science state overlap. This is acceptable.

Command Approval Checklist is attached.

Carol

--

Carol Weaver

University of New Hampshire

503.902.8492

From: NIgel Angold <nangold@princeton.edu>
Date: Wednesday, 2021-July-28 at 22:32
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 #537 ATS Approval (09 - 18 Aug, 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_221_o0537a_v001.scr

Nigel

All,

   Attached are the planning files for Orbit #537. Please respond to this thread with comments and approvals.

Approvals are required by COB 29 July 2021

Please note the following:

Battery Balancing this orbit

Begin 2021/08:18:11:00:00– End 2021/08:18:12:30:00

Command Load Constraint Violation Report (CCVR)

IBEX_2021_221_o0537a_v001.ccvr

# Input files:         1

#   IBEX_2021_221_o0537a_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 2021/08/09 19:56:27 UTC

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

             transition to science mode at 2021/08/13 15:46:15 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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