[Isocops] IBEX Orbit #521 ATS Approval (15 - 25 Mar 21
Weaver, Carol
Carol.Weaver at unh.edu
Fri Mar 5 15:46:49 EST 2021
Hi all,
I have looked at the orbit 521 ATS files,
IBEX_2021_074_o0521a_INST_v001.scr, IBEX_2021_074_o0521a_BUS_v001.scr
and I approve.
The constraint violations in
IBEX_2021_074_o0521a_BUS_v001.ccvr and IBEX_2021_074_o0521a_INST_v001.ccvr
are from the removal of the
ACT_SetSpinPulseProtectEnable Enable
commands (2). The violations are acceptable.
The PL commands in IBEX_2021_074_o0521a_INST_v001.scr
match those in the v002 STF, IBEX_2021_074_o0521a_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_074_o0521a_BUS_v001.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_Orbit521_Contacts.txt,
for all contacts (5) and reset master timer in Orbit 519.
We are doing battery cell balancing this orbit and it is appropriately placed.
The inertial precession maneuver at perigee of orbit 520 left us pointing in safe directions for the orbit 521 arc A ascending and descending sequences:
ibex_rotate -o -u 0.991781,-0.113543,-0.058975 -w ibex-sun -t 2021/03:16:02:07:13
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. +355.787 Decl. -1.846 (ibex-sun)
error is R.A. +2.318 Decl. +1.535
for a total 2.778 deg
ibex_rotate -o -u 0.991781,-0.113543,-0.058975 -w ibex-sun -t 2021/03:19:19:32:40
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. +359.297 Decl. -0.299 (ibex-sun)
error is R.A. +5.828 Decl. +3.082
for a total 6.590 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 0.99883,-0.039419,-0.028009 -w ibex-sun -t 2021/03:19:21:15:48
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.998830,-0.039419,-0.028009
which is R.A. +357.740 Decl. -1.605
missing R.A. +359.362 Decl. -0.269 (ibex-sun)
error is R.A. +1.622 Decl. +1.336
for a total 2.101 deg
ibex_rotate -o -u 0.99883,-0.039419,-0.028009 -w ibex-sun -t 2021/03:19:22:50:54
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.998830,-0.039419,-0.028009
which is R.A. +357.740 Decl. -1.605
missing R.A. +359.422 Decl. -0.242 (ibex-sun)
error is R.A. +1.682 Decl. +1.363
for a total 2.165 deg
ibex_rotate -o -u 0.99883,-0.039419,-0.028009 -w ibex-sun -t 2021/03:24:11:25:31
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.998830,-0.039419,-0.028009
which is R.A. +357.740 Decl. -1.605
missing R.A. +3.419 Decl. +1.496 (ibex-sun)
error is R.A. +354.321 Decl. +3.101
for a total 6.470 deg
The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 522 apogee:
ibex_rotate -o -u 0.999417,0.033783,0.004869 -w ibex-sun -t 2021/03:24:19:56:06
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.999417,+0.033783,+0.004869
which is R.A. +1.936 Decl. +0.279
missing R.A. +3.739 Decl. +1.618 (ibex-sun)
error is R.A. +1.803 Decl. +1.339
for a total 2.246 deg
ibex_rotate -o -u 0.999417,0.033783,0.004869 -w ibex-sun -t 2021-03-29T11:02:26
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.999417,+0.033783,+0.004869
which is R.A. +1.936 Decl. +0.279
missing R.A. +8.073 Decl. +3.498 (ibex-sun)
error is R.A. +6.137 Decl. +3.219
for a total 6.926 deg
Lo Normal mode for the entire orbit.
There is no overlap with orbit 520 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: Tuesday, 2021-March-2 at 15:09
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 #521 ATS Approval (15 - 25 Mar 21
Caution - External Email
All,
Attached are the planning files for Orbit #521
Please respond to this thread with comments and approvals.
Approvals are required by COB on 05 March 2021
Please note the following:
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.
2. Battery Balancing this orbit
Begin 2021/03:24:23:30:00– End 2021/03:25:01:00:00
1. # Orbit# 519 Reset Master Timer - 2021/03:06:19:45:00
1. APL Contact 2021-03-24,083,22:00:00 - 2021-03-24,083,23:00:00
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_074_o0521a_v001.ccvr
# Input files: 1
# IBEX_2021_074_o0521a_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 2021/03/15 22:57:28 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2021/03/19 22:20:54 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 01D711D6.BD4D6B00]
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