[Isocops] IBEX Orbit #526 ATS Approval ( 30 Apr – `10 May 21)
Weaver, Carol
Carol.Weaver at unh.edu
Thu Apr 15 15:53:48 EDT 2021
Hi all,
I have looked at the orbit 0526 ATS files, IBEX_2021_120_o0526a_BUS_v001.scr, IBEX_2021_120_o0526a_INST_v001.scr and I approve.
The constraint violations in IBEX_2021_120_o0526a_BUS_v001.ccvr and IBEX_2021_120_o0526a_INST_v001.ccvr
are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.
The PL commands in IBEX_2021_120_o0526a_INST_v001.scr match those in the STF, IBEX_2021_120_o0526a_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_120_o0526a_BUS_v001.oef and as verified with ibex_orbit.
There is one star tracker outage lasting for ~9.5 hours ending about an hour before the perigee maneuver takes place.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit526_Contacts.txt for all contacts (3).
No Battery Balancing this orbit
The Inertial maneuver at perigee of orbit 0525 left us pointing in safe directions for the orbit 0526 arc A ascending and descending sequences:
ibex_rotate -o -u 0.788422,0.567896,0.236397 -w ibex-sun -t 2021/04:30:23:09:39
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.788423,+0.567896,+0.236397
which is R.A. +35.765 Decl. +13.674
missing R.A. +38.079 Decl. +14.951 (ibex-sun)
error is R.A. +2.314 Decl. +1.277
for a total 2.580 deg
ibex_rotate -o -u 0.788422,0.567896,0.236397 -w ibex-sun -t 2021/05:04:18:09:36
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.788423,+0.567896,+0.236397
which is R.A. +35.765 Decl. +13.674
missing R.A. +41.804 Decl. +16.121 (ibex-sun)
error is R.A. +6.039 Decl. +2.447
for a total 6.327 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 0.738961,0.622087,0.258735 -w ibex-sun -t 2021/05:04:19:52:44
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.738961,+0.622087,+0.258735
which is R.A. +40.092 Decl. +14.995
missing R.A. +41.874 Decl. +16.143 (ibex-sun)
error is R.A. +1.782 Decl. +1.148
for a total 2.065 deg
ibex_rotate -o -u 0.738961,0.622087,0.258735 -w ibex-sun -t 2021/05:04:21:27:50
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.738961,+0.622087,+0.258735
which is R.A. +40.092 Decl. +14.995
missing R.A. +41.939 Decl. +16.163 (ibex-sun)
error is R.A. +1.847 Decl. +1.168
for a total 2.128 deg
ibex_rotate -o -u 0.738961,0.622087,0.258735 -w ibex-sun -t 2021/05:09:11:36:25
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.738961,+0.622087,+0.258735
which is R.A. +40.092 Decl. +14.995
missing R.A. +46.319 Decl. +17.418 (ibex-sun)
error is R.A. +6.227 Decl. +2.423
for a total 6.451 deg
The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0527 apogee:
ibex_rotate -o -u 0.683656,0.673118,0.282007 -w ibex-sun -t 2021/05:09:17:31:42
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.683656,+0.673118,+0.282007
which is R.A. +44.555 Decl. +16.380
missing R.A. +46.547 Decl. +17.469 (ibex-sun)
error is R.A. +1.992 Decl. +1.089
for a total 2.194 deg
ibex_rotate -o -u 0.683656,0.673118,0.282007 -w ibex-sun -t 2021-05-14T12:26:56
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.683656,+0.673118,+0.282007
which is R.A. +44.555 Decl. +16.380
missing R.A. +51.317 Decl. +18.707 (ibex-sun)
error is R.A. +6.762 Decl. +2.327
for a total 6.853 deg
There is an overlap with orbit 0525 commands where the Science command and LO_SCIENCE_MODE are sent before a contact in the 0525 ATS. This is acceptable.
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-April-14 at 12:03
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>, Fairchild, Kenneth <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 #526 ATS Approval ( 30 Apr – `10 May 21)
Caution - External Email
All,
Attached are the planning files for Orbit #526. Please respond to this thread with comments and approvals.
Approvals are required by COB on 19 April 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. No Battery Balancing this orbit
1. # Orbit# 524 Reset Master Timer - 2021/04:21:20:15:00
1. Command Load Constraint Violation Report (CCVR)
IBEX_2021_120_o0526a_v001.ccvr
# Input files: 1
# IBEX_2021_120_1500_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 2021/04/30 19:12:26 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2021/05/04 20:57:50 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 01D7320F.84892E40]
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