[Isocops] IBEX Orbit #539 ATS Approval (27 Aug – 05 Sept, 2021)
Carol Weaver
Carol.Weaver at unh.edu
Tue Aug 17 12:18:00 EDT 2021
Hi all,
I have looked at the orbit 0539 ATS file, IBEX_2021_239_o0539a_v001.scr and I approve.
The constraint violations in IBEX_2021_239_o0539a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.
The PL commands in IBEX_2021_239_o0539a_v001.scr match those in the STF, IBEX_2021_239_o0539a_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_239_o0539a_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_Orbit539_Contacts.txt for all contacts (3).
We are doing Battery Balancing and it is appropriate length and placed away from instrument macros and maneuvers.
The Inertial maneuver at perigee of orbit 0538 left us pointing in safe directions for the orbit 0539 arc A ascending and descending sequences:
ibex_rotate -o -u -0.880372,0.43865,0.180365 -w ibex-sun -t 2021/08:27:19:06:12
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.880372,+0.438650,+0.180365
which is R.A. +153.515 Decl. +10.391
missing R.A. +156.301 Decl. +9.864 (ibex-sun)
error is R.A. +2.786 Decl. +0.527
for a total 2.793 deg
ibex_rotate -o -u -0.880372,0.43865,0.180365 -w ibex-sun -t 2021/08:31:10:44:53
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.880372,+0.438650,+0.180365
which is R.A. +153.515 Decl. +10.391
missing R.A. +159.528 Decl. +8.628 (ibex-sun)
error is R.A. +6.013 Decl. +1.763
for a total 6.186 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 -0.913727,0.376667,0.152399 -w ibex-sun -t 2021/08:31:12:28:01
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.913727,+0.376667,+0.152399
which is R.A. +157.597 Decl. +8.766
missing R.A. +159.593 Decl. +8.603 (ibex-sun)
error is R.A. +1.996 Decl. +0.163
for a total 1.980 deg
ibex_rotate -o -u -0.913727,0.376667,0.152399 -w ibex-sun -t 2021/08:31:14:03:07
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.913727,+0.376667,+0.152399
which is R.A. +157.597 Decl. +8.766
missing R.A. +159.654 Decl. +8.580 (ibex-sun)
error is R.A. +2.057 Decl. +0.186
for a total 2.042 deg
ibex_rotate -o -u -0.913727,0.376667,0.152399 -w ibex-sun -t 2021/09:05:01:46:04
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.913727,+0.376667,+0.152399
which is R.A. +157.597 Decl. +8.766
missing R.A. +163.842 Decl. +6.892 (ibex-sun)
error is R.A. +6.245 Decl. +1.874
for a total 6.464 deg
The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0540 apogee:
ibex_rotate -o -u -0.942244,0.31076,0.124918 -w ibex-sun -t 2021/09:05:05:25:10
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.942244,+0.310760,+0.124918
which is R.A. +161.747 Decl. +7.176
missing R.A. +163.980 Decl. +6.829 (ibex-sun)
error is R.A. +2.233 Decl. +0.347
for a total 2.243 deg
ibex_rotate -o -u -0.942244,0.31076,0.124918 -w ibex-sun -t 2021-09-09T21:37:34
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.942244,+0.310760,+0.124918
which is R.A. +161.747 Decl. +7.176
missing R.A. +168.066 Decl. +5.136 (ibex-sun)
error is R.A. +6.319 Decl. +2.040
for a total 6.605 deg
There is no overlap with orbit 0538 commands.
Command Approval Checklist is attached.
Carol
--
Carol Weaver
University of New Hampshire
503.902.8492
From: Perry, Timothy E [US] (SP) <Timothy.Perry at ngc.com>
Date: Friday, 2021-August-13 at 11:41
To: 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>, Perry, Timothy E [US] (SP) <Timothy.Perry at ngc.com>, 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: IBEX Orbit #539 ATS Approval (27 Aug – 05 Sept, 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.
All,
Attached are the planning files for Orbit #538. Please respond to this thread with comments and approvals.
Approvals are required by COB 17 Aug 2021
Please note the following:
1. Battery Balancing this orbit
Begin 09/05/202111:00:00 – End 09/05/2021 12:30:00
1. Command Load Constraint Violation Report (CCVR)
IBEX_2021_239_o0539a_v001.ccvr
# Input files: 1
# IBEX_2021_239_o0539a_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 2021/08/27 16:16:33 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2021/08/31 13:33:07 UTC
==============
OTHER MESSAGES
==============
NO MESSAGES..
Timothy E.Perry
CRS IBEX OCO-2
Mission Operations
timothy.perry at ngc.com
Office (703) 406-5976
Cell (301) 606-1430
[cid:image001.png at 01D79361.EA8D2B70]
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