[Isocops] IBEX Orbit #520 ATS Approval (06 – 15 Mar 21)
Weaver, Carol
Carol.Weaver at unh.edu
Thu Feb 25 11:45:37 EST 2021
Hi all,
I have looked at the orbit 520 ATS files,
'IBEX_2021_065_o0520a_INST_v002.scr', 'IBEX_2021_065_o0520a_BUS_v002.scr'
and I approve.
The constraint violations in
IBEX_2021_065_o0520a_INST_v002.ccvr and IBEX_2021_065_o0520a_BUS_v002.ccvr
are from the removal of the
ACT_SetSpinPulseProtectEnable Enable
commands (2); and having transmissions closer than the 18000 second window. The violations are acceptable.
The PL commands in IBEX_2021_065_o0520a_INST_v002.scr
match those in the v004 STF, IBEX_2021_065_o0520a_v004.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_065_o0520a_BUS_v002.oef
and as verified with ibex_orbit.
There are no star tracker outages.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file,
IBEX_Orbit520_Contacts.txt,
for all contacts (3) and reset master timer in Orbit 518.
We are not doing battery cell balancing this orbit.
The intertial precession maneuver at perigee of orbit 519 left us pointing in safe directions for the orbit 519 arc A ascending and descending sequences:
ibex_rotate -o -u 0.974523,-0.201548,-0.098399 -w ibex-sun -t 2021/03:07:01:04:02
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.974523,-0.201548,-0.098399
which is R.A. +348.315 Decl. -5.647
missing R.A. +347.474 Decl. -5.394 (ibex-sun)
error is R.A. +0.841 Decl. +0.253
for a total 0.874 deg
ibex_rotate -o -u 0.974523,-0.201548,-0.098399 -w ibex-sun -t 2021/03:10:14:52:00
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.974523,-0.201548,-0.098399
which is R.A. +348.315 Decl. -5.647
missing R.A. +350.873 Decl. -3.927 (ibex-sun)
error is R.A. +2.558 Decl. +1.720
for a total 3.075 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 0.984615,-0.156282,-0.078163 -w ibex-sun -t 2021/03:10:16:35:08
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.984615,-0.156282,-0.078163
which is R.A. +350.981 Decl. -4.483
missing R.A. +350.938 Decl. -3.898 (ibex-sun)
error is R.A. +0.043 Decl. +0.585
for a total 0.586 deg
ibex_rotate -o -u 0.984615,-0.156282,-0.078163 -w ibex-sun -t 2021/03:10:18:10:14
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.984615,-0.156282,-0.078163
which is R.A. +350.981 Decl. -4.483
missing R.A. +350.999 Decl. -3.871 (ibex-sun)
error is R.A. +0.018 Decl. +0.612
for a total 0.612 deg
ibex_rotate -o -u 0.984615,-0.156282,-0.078163 -w ibex-sun -t 2021/03:15:05:33:07
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.984615,-0.156282,-0.078163
which is R.A. +350.981 Decl. -4.483
missing R.A. +354.980 Decl. -2.157 (ibex-sun)
error is R.A. +3.999 Decl. +2.326
for a total 4.620 deg
The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 521 apogee:
ibex_rotate -o -u 0.991781,-0.113543,-0.058975 -w ibex-sun -t 2021/03:15:15:17:24
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.991781,-0.113543,-0.058975
which is R.A. +353.469 Decl. -3.381
missing R.A. +355.354 Decl. -2.015 (ibex-sun)
error is R.A. +1.885 Decl. +1.366
for a total 2.326 deg
ibex_rotate -o -u 0.991781,-0.113543,-0.058975 -w ibex-sun -t 2021-03-20T07:02:12
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.991781,-0.113543,-0.058975
which is R.A. +353.469 Decl. -3.381
missing R.A. +359.731 Decl. -0.103 (ibex-sun)
error is R.A. +6.262 Decl. +3.278
for a total 7.065 deg
Lo Normal mode for the entire orbit.
There is no overlap with orbit 519 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: Wednesday, 2021-February-24 at 17:26
To: Weaver, Carol <Carol.Weaver at unh.edu>, Chubin, Eric [US] (SP) <Eric.Chubin at ngc.com>, Heirtzler, David <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>, 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 #520 ATS Approval (06 – 15 Mar 21)
Caution - External Email
All,
Attached are the planning files for Orbit #520
Please respond to this thread with comments and approvals.
Approvals are required by 1700 on 25 February 2021
Please note the following:
1. Please note that these products are a version #2 set.
1. I generated 3 separate ATS files BUS, INST and a complete file. The BUS and INST will be the files to be uplinked. The complete ATS, I used as a sanity check to see how the commands lined up. Since we are in a new phase of ATS generation. IF you have any ideas of doing this differently, let me know.
1. The 3 ATS files have been changed to word files and encrypted. I will send out another email with the password. The files that have been transferred via MFT have not been encrypted and are still text files.
1. I moved the 2 House Keeping commands from the INST ATS to the BUS ATS. I commented out the 2 commands in the INST ATS. If for some reason we were unable to uplink the INST Commands for this orbit, we would have been in the wrong spacecraft state for executing the maneuver commands.
1. No Battery Balancing this orbit
1. # Orbit# 518 Reset Master Timer - 2021/02:25:19:45:00
1. APL Contact
* Just a reminder for the APL contact. We start off at 2k D\L, after 5 minutes we switch to 320k D\L, Then 5 minutes later we start the SSR Dump with Dump New command
1. Command Load Constraint Violation Report (CCVR)
# IBEX_2021_065_o0520a_v002.scr
==========================
HARD CONSTRAINT VIOLATIONS
==========================
NO VIOLATIONS.
==========================
SOFT CONSTRAINT VIOLATIONS
==========================
These 2 IBX-CLC-006 errors are acceptable.
IBX-CLC-006: Planned transmission at 2021/03/15 11:58:00 UTC - 2021/03/15
13:02:00 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 5880.000 seconds)
IBX-CLC-006: Planned transmission at 2021/03/15 17:28:00 UTC - 2021/03/15
18:32:00 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 5880.000 seconds)
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2021/03/06 22:24:25 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2021/03/10 17:40:14 UTC
==============
OTHER MESSAGES
==============
NO MESSAGES.
1.
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 01D70B6B.BAACEC20]
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