[Isocops] IBEX Orbit #518 ATS Approval (16 - 25 Feb 21)
Weaver, Carol
Carol.Weaver at unh.edu
Sat Feb 6 16:53:37 EST 2021
All,
Note: Angle at orbit 518 arc B descending after the apogee sun precession maneuver: 4.101 deg
Angle at Orbit 519 apogee after the perigee sun precession maneuver: 4.856 deg
I have looked at the orbit 518 ATS files,
'IBEX_2021_047_o0518a_INST_v001.scr', 'IBEX_2021_047_o0518a_BUS_v001.scr'
and I approve.
The only constraint violations in
IBEX_2021_047_o0518a_BUS_v001.ccvr
and
IBEX_2021_047_o0518a_INST_v001.ccvr
are from the removal of the
ACT_SetSpinPulseProtectEnable Enable
commands (2); the violations are expected.
The PL commands in
IBEX_2021_047_o0518a_INST_v001.scr
match those in the v002 STF,
IBEX_2021_047_o0518a_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_047_o0518a_BUS_v001.oef
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts 4 days before apogee and runs for ~17 hours. Some despinning may be required due to this outage.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file,
IBEX_Orbit518_Contacts.txt,
for all contacts (3).
We are doing battery cell balancing this orbit and the balancing commands are correct and offset by enough time from other commands.
The inertial precession maneuver at perigee of orbit 517 left us pointing in safe directions for the orbit 518 arc A ascending and descending sequences:
ibex_rotate -o -u 0.855404,-0.471118,-0.215247 -w ibex-sun -t 2021/02:16:18:53:43
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.855404,-0.471118,-0.215247
which is R.A. +331.156 Decl. -12.430
missing R.A. +330.213 Decl. -12.174 (ibex-sun)
error is R.A. +0.943 Decl. +0.256
for a total 0.956 deg
ibex_rotate -o -u 0.855404,-0.471118,-0.215247 -w ibex-sun -t 2021/02:20:22:51:56
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.855404,-0.471118,-0.215247
which is R.A. +331.156 Decl. -12.430
missing R.A. +334.307 Decl. -10.630 (ibex-sun)
error is R.A. +3.151 Decl. +1.800
for a total 3.574 deg
The sun 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 -r +334.355 -d -10.611 -w ibex-sun -t 2021/02:21:00:05:22
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.886077,-0.425393,-0.184140
which is R.A. +334.355 Decl. -10.611
missing R.A. +334.355 Decl. -10.611 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +334.355 -d -10.611 -w ibex-sun -t 2021/02:21:01:37:00
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.886077,-0.425393,-0.184140
which is R.A. +334.355 Decl. -10.611
missing R.A. +334.414 Decl. -10.587 (ibex-sun)
error is R.A. +0.059 Decl. +0.024
for a total 0.063 deg
ibex_rotate -o -r +334.355 -d -10.611 -w ibex-sun -t 2021/02:25:04:56:56
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.886077,-0.425393,-0.184140
which is R.A. +334.355 Decl. -10.611
missing R.A. +338.233 Decl. -9.120 (ibex-sun)
error is R.A. +3.878 Decl. +1.491
for a total 4.101 deg
The sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 519 apogee:
ibex_rotate -o -r +338.390 -d -9.066 -w ibex-sun -t 2021/02:25:08:50:56
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.918098,-0.363686,-0.157572
which is R.A. +338.390 Decl. -9.066
missing R.A. +338.390 Decl. -9.066 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.001 deg
ibex_rotate -o -r +338.390 -d -9.066 -w ibex-sun -t 2021-03-02T01:42:14
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.918098,-0.363686,-0.157572
which is R.A. +338.390 Decl. -9.066
missing R.A. +342.933 Decl. -7.235 (ibex-sun)
error is R.A. +4.543 Decl. +1.831
for a total 4.856 deg
Lo Normal mode for the entire orbit.
There is an overlap with orbit 517 commands with the last transmission and transition to science mode, but this is okay.
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-3 at 14:49
To: Weaver, Carol <Carol.Weaver at unh.edu>, Chubin, Eric [US] (SP) <Eric.Chubin at ngc.com>, Heirtzler, David <David.Heirtzler at unh.edu>, IBEX at applieddefense.info <IBEX at applieddefense.info>, 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 umontana.edu <paul.janzen at umontana.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 #518 ATS Approval (16 - 25 Feb 21)
Caution - External Email
All,
Attached are the planning files for Orbit #518
Please respond to this thread with comments and approvals.
Approvals are required by COB on 06 February 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.
1. Apogee Sun Maneuver - 2021/02:20:23:50:22
1. Perigee Sun Maneuver - 2021/02:25:08:35:56
1. Battery Balancing this orbit
Begin 2021/02:25:13:00:00 – End 2021/02:25:14:30:00
1. # Orbit# 516 Reset Master Timer - 2021/02:07:16:45:00
1. Command Load Constraint Violation Report (CCVR)
IBEX_2021_047_o0518a_v001.ccvr
# Input files: 1
# IBEX_2021_047_o0518a_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 2021/02/16 15:45:27 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2021/02/21 01:07:00 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
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