[Isocops] IBEX Orbit #495 ATS Approval ( 22 - 31 July 2020 )
Weaver, Carol
Carol.Weaver at unh.edu
Thu Jul 2 13:45:59 EDT 2020
Hi all,
I have looked at the orbit 495 ATS files IBEX_2020_204_o0495a_BUS_v001.scr and IBEX_2020_204_o0495a_INST_v001.scr and I approve.
There is no overlap with orbit 494 commands by manual inspection or by checking at http://ibex.unh.edu/cgi-bin/ats.cgi<https://nam12.safelinks.protection.outlook.com/?url=http%3A%2F%2Fibex.unh.edu%2Fcgi-bin%2Fats.cgi&data=02%7C01%7Ccarol.weaver%40unh.edu%7Ce88fc1e213c7452e674408d8191a4cbc%7Cd6241893512d46dc8d2bbe47e25f5666%7C0%7C0%7C637286949243649702&sdata=Sk1kOcbJlFgobNRQ2%2BKW3qUFDZ5qi%2FssI132IY4a3Gw%3D&reserved=0>, but the commands were difficult to read on the website.
The only constraint violations in IBEX_2020_204_o0495a_INST_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands (2); the violations are expected.
The PL commands in IBEX_2020_204_o0495a_INST_v001.scr match those in the IBEX_2020_204_o0495a_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_2020_204_o0495a_BUS_v001.oef and as verified with ibex_orbit.
There is one star tracker outage this orbit. It starts about 15 minutes before perigee and runs for about 7 hours.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit495_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 494 left us pointing in a safe direction for the orbit 495 arc A ascending and descending sequences:
ibex_rotate -o -u -0.458951,0.818679,0.345151 -w ibex-sun -t 2020/07:22:14:55:56
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.458951,+0.818679,+0.345151
which is R.A. +119.275 Decl. +20.191
missing R.A. +122.132 Decl. +20.137 (ibex-sun)
error is R.A. +2.857 Decl. +0.054
for a total 2.682 deg
ibex_rotate -o -u -0.458951,0.818679,0.345151 -w ibex-sun -t 2020/07:26:07:20:54
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.458951,+0.818679,+0.345151
which is R.A. +119.275 Decl. +20.191
missing R.A. +125.748 Decl. +19.389 (ibex-sun)
error is R.A. +6.473 Decl. +0.802
for a total 6.143 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 -0.523944,0.785413,0.329559 -w ibex-sun -t 2020/07:26:09:04:02
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.523944,+0.785413,+0.329559
which is R.A. +123.707 Decl. +19.242
missing R.A. +125.820 Decl. +19.374 (ibex-sun)
error is R.A. +2.113 Decl. +0.132
for a total 1.998 deg
ibex_rotate -o -u -0.523944,0.785413,0.329559 -w ibex-sun -t 2020/07:26:10:39:08
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.523944,+0.785413,+0.329559
which is R.A. +123.707 Decl. +19.242
missing R.A. +125.886 Decl. +19.360 (ibex-sun)
error is R.A. +2.179 Decl. +0.118
for a total 2.060 deg
ibex_rotate -o -u -0.523944,0.785413,0.329559 -w ibex-sun -t 2020/07:30:23:35:55
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.523944,+0.785413,+0.329559
which is R.A. +123.707 Decl. +19.242
missing R.A. +130.418 Decl. +18.280 (ibex-sun)
error is R.A. +6.711 Decl. +0.962
for a total 6.426 deg
The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 496 apogee:
ibex_rotate -o -u -0.588573,0.745263,0.313313 -w ibex-sun -t 2020/07:31:03:10:52
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.588573,+0.745263,+0.313313
which is R.A. +128.300 Decl. +18.259
missing R.A. +130.556 Decl. +18.238 (ibex-sun)
error is R.A. +2.256 Decl. +0.021
for a total 2.142 deg
ibex_rotate -o -u -0.588573,0.745263,0.313313 -w ibex-sun -t 2020-08-04T23:24:43
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.588573,+0.745263,+0.313313
which is R.A. +128.300 Decl. +18.259
missing R.A. +135.150 Decl. +17.013 (ibex-sun)
error is R.A. +6.850 Decl. +1.246
for a total 6.645 deg
Lo Background mode for the entire orbit.
Command approval checklist is attached.
Thanks,
Carol
--
Carol Weaver
University of New Hampshire
503.902.8492
From: "Perry, Timothy E [US] (IS)" <Timothy.Perry at ngc.com>
Date: Wednesday, 1 July 2020 at 17:22
To: "Weaver, Carol" <Carol.Weaver at unh.edu>, "Chubin, Eric [US] (IS)" <Eric.Chubin at ngc.com>, "Heirtzler, David" <David.Heirtzler at unh.edu>, IBEX FDG <IBEX at applieddefense.info>, IBEXOPS <IBEXOPS at gmail.com>, ISOC <isocops at lists.sr.unh.edu>, Ken Fairchild <fair-play at comcast.net>, "Ken Fairchild (kwfairchild at gmail.com)" <kwfairchild at gmail.com>, Nigel Angold <nigel.angold at nasa.gov>, Nigel Angold <angoldconsulting at earthlink.net>, Paul Janzen <paul.janzen at umontana.edu>, "Perry, Timothy E [US] (IS)" <Timothy.Perry at ngc.com>, "Tyler, Ryan S [US] (IS)" <Ryan.Tyler at ngc.com>, "Wesley, Sheral R [US] (IS)" <Sheral.Wesley at ngc.com>, "Wynn, Reese [US] (IS)" <Reese.Wynn at ngc.com>
Subject: IBEX Orbit #495 ATS Approval ( 22 - 31 July 2020 )
Caution - External Email
All,
Attached are the planning files for Orbit #495
Please respond to this thread with comments and approvals.
Approvals are required by 1600 on 03 July 2020
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. Battery Balancing
# Orbit 495 Battery Balancing
# 2020-07-31T08:59:58.888Z,Perigee,orbit:495
@ECT_SetLongEclipseFlag TRUE $TIME=2020/07:31:08:00:00
@ECT_SetLongEclipseFlag FALSE $TIME=2020/07:31:09:30:00
1. Reset Master Timer Orbit #493
# Orbit# 493 Reset Master Timer
@EMR_StrobeMReset $TIME=2020/07:13:00:15:00
1. Command Load Constraint Violation Report (CCVR)
IBEX_2020_204_o0495a_v001.ccvr
==========================
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 2020/07/22 12:19:16 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2020/07/26 10:09:08 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 01D6506E.BC43E880]
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