[Isocops] IBEX Orbit #541 ATS Approval (14 - 23 Sept, 2021)
Carol Weaver
Carol.Weaver at unh.edu
Wed Sep 8 10:01:15 EDT 2021
Hi all,
The 541 ATS is already on board and this is a retroactive approval before its execution. The one issue found in the ATS has been fixed in the uploaded commands.
The angle at Orbit 542 apogee after the perigee sun precession maneuver is 4.528 degrees.
I have looked at the orbit 0541 ATS file, IBEX_2021_257_o0541a_v001.scr and I approve.
The constraint violations in IBEX_2021_257_o0541a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands and adding the commanding tracks for the end of the Hi background test. The violations are acceptable.
The PL commands in IBEX_2021_257_o0541a_v001.scr match those in the STF, IBEX_2021_257_o0541a_v002.stf, aside from the fixed command in the ATS.
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_257_o0541a_v001.oef and as verified with ibex_orbit.
There are 2 star tracker outages this orbit. First outage lasts for 2 days and 2:08:37 hours and ends 8:41:44 hours before the apogee maneuver. The second star track outage lasts for 1:38:47 hours directly during the perigee maneuver.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit541_Contacts.txt for all contacts (5).
No Battery Balancing this orbit
The Inertial maneuver at perigee of orbit 0540 left us pointing in safe directions for the orbit 0541 arc A ascending and descending sequences:
ibex_rotate -o -u -0.9817,0.178104,0.067406 -w ibex-sun -t 2021/09:14:17:28:18
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.981700,+0.178104,+0.067406
which is R.A. +169.717 Decl. +3.865
missing R.A. +172.500 Decl. +3.218 (ibex-sun)
error is R.A. +2.783 Decl. +0.647
for a total 2.852 deg
ibex_rotate -o -u -0.9817,0.178104,0.067406 -w ibex-sun -t 2021/09:18:22:12:22
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.981700,+0.178104,+0.067406
which is R.A. +169.717 Decl. +3.865
missing R.A. +176.161 Decl. +1.678 (ibex-sun)
error is R.A. +6.444 Decl. +2.187
for a total 6.798 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 -0.993233,0.110145,0.036836 -w ibex-sun -t 2021/09:18:23:55:29
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.993233,+0.110145,+0.036836
which is R.A. +173.672 Decl. +2.111
missing R.A. +176.226 Decl. +1.651 (ibex-sun)
error is R.A. +2.554 Decl. +0.460
for a total 2.594 deg
ibex_rotate -o -u -0.993233,0.110145,0.036836 -w ibex-sun -t 2021/09:19:01:30:36
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.993233,+0.110145,+0.036836
which is R.A. +173.672 Decl. +2.111
missing R.A. +176.286 Decl. +1.626 (ibex-sun)
error is R.A. +2.614 Decl. +0.485
for a total 2.657 deg
ibex_rotate -o -u -0.993233,0.110145,0.036836 -w ibex-sun -t 2021/09:22:19:16:28
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.993233,+0.110145,+0.036836
which is R.A. +173.672 Decl. +2.111
missing R.A. +179.754 Decl. +0.121 (ibex-sun)
error is R.A. +6.082 Decl. +1.990
for a total 6.398 deg
The Sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0542 apogee:
ibex_rotate -o -r +179.897 -d +0.052 -w ibex-sun -t 2021/09:22:23:00:41
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. +179.897 Decl. +0.052 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +179.897 -d +0.052 -w ibex-sun -t 2021-09-27T17:10:45
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. +184.054 Decl. -1.743 (ibex-sun)
error is R.A. +4.157 Decl. +1.795
for a total 4.528 deg
There is no overlap with orbit 0540 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-September-3 at 13:29
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 #541 ATS Approval (14 - 23 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 #541. Please respond to this thread with comments and approvals.
Approvals are required by COB 04 Sept 2021
Please note the following:
1. Perigee Sun Maneuver - 2021/09:22:22:45:41
1. No Battery Balancing this orbit
1. Command Load Constraint Violation Report (CCVR)
The 2 IBX-CLC-006 soft violations are acceptable. The reason is that I added a contact for the end of Hi background test.
IBEX,USHI02,ADD,09/22/21,265,16:30:00,09/22/21,265,17:30:00,LAHO 64K IBEX-2 Orbit# 540 Tracking/End Hi Background Test Contact 16re Desc
IBEX,AUWA01,ADD,09/22/21,265,19:30:00,09/22/21,265,20:30:00,LAHO 160K IBEX-2 Orbit# 541 SSR_Dump/Tracking Contact 15re Desc
IBEX_2021_257_o0541a_v001.ccvr
# Input files: 1
# IBEX_2021_257_o0541a_v001.scr
==========================
HARD CONSTRAINT VIOLATIONS
==========================
NO VIOLATIONS.
==========================
SOFT CONSTRAINT VIOLATIONS
==========================
IBX-CLC-006: Planned transmission at 2021/09/22 16:28:00 UTC - 2021/09/22
17:32:00 UTC is followed by one or more additional transmissions
which, when combined, exceed the maximum transmission time of 5400
seconds within a 18000-second window (total planned transmission
time this window is 7680.000 seconds)
IBX-CLC-006: Planned transmission at 2021/09/22 19:28:00 UTC - 2021/09/22
20:32:00 UTC is preceded by one or more additional transmissions
which, when combined, exceed the maximum transmission time of 5400
seconds within a 18000-second window (total planned transmission
time this window is 7680.000 seconds)
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2021/09/14 14:43:12 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2021/09/19 01:00:36 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 01D7A498.74AE8E60]
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.sr.unh.edu/pipermail/isocops/attachments/20210908/5734ba55/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.png
Type: image/png
Size: 5048 bytes
Desc: image001.png
URL: <https://lists.sr.unh.edu/pipermail/isocops/attachments/20210908/5734ba55/image001-0001.png>
More information about the Isocops
mailing list