[Isocops] [Not Virus Scanned] IBEX Orbit #537 ATS Approval (09 - 18 Aug, 2021)
Carol Weaver
Carol.Weaver at unh.edu
Thu Jul 29 13:54:54 EDT 2021
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 at princeton.edu>
Date: Wednesday, 2021-July-28 at 22:32
To: Perry, Timothy E [US] (SP) <Timothy.Perry at ngc.com>
Cc: Carol Weaver <carol.weaver at unh.edu>, Chubin, Eric [US] (SP) <Eric.Chubin at ngc.com>, David Heirtzler <David.Heirtzler at unh.edu>, ADS-IBEX at l3harris.com <ADS-IBEX at l3harris.com>, IBEXOPS at gmail.com <IBEXOPS at gmail.com>, isocops at lists.sr.unh.edu <isocops at lists.sr.unh.edu>, fair-play at comcast.net <fair-play at comcast.net>, kwfairchild at gmail.com <kwfairchild at gmail.com>, Kenneth Fairchild <Ken.Fairchild at unh.edu>, angoldconsulting at earthlink.net <angoldconsulting at earthlink.net>, Paul.Janzen at mso.umt.edu <Paul.Janzen at mso.umt.edu>, Tyler, Ryan S [US] (SP) <Ryan.Tyler at ngc.com>, Wesley, Sheral R [US] (SP) <Sheral.Wesley at ngc.com>, Wynn, Reese [US] (SP) <Reese.Wynn at 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:
1. Battery Balancing this orbit
Begin 2021/08:18:11:00:00– End 2021/08:18:12:30:00
1. 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 at ngc.com<mailto:timothy.perry at ngc.com>
Office (703) 406-5976
Cell (301) 606-1430
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