[Isocops] IBEX Orbit #519 ATS Approval (25 Feb – 06 Mar 21)
Weaver, Carol
Carol.Weaver at unh.edu
Mon Feb 15 17:17:31 EST 2021
All,
Note: Angle at orbit 519 arc B descending after the apogee sun precession maneuver: 4.018 deg
I have looked at the orbit 519 ATS files,
IBEX_2021_056_o0519a_INST_v002.scr, IBEX_2021_056_o0519a_BUS_v001.scr
and I approve.
The only constraint violations in
IBEX_2021_056_o0519a_BUS_v001.ccvr
and
IBEX_2021_056_o0519a_INST_v001.ccvr
are from the removal of the
ACT_SetSpinPulseProtectEnable Enable
commands (2); the violations are expected.
The PL commands in
IBEX_2021_056_o0519a_INST_v002.scr
match those in the v002 STF,
IBEX_2021_056_o0519a_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_056_o0519a_BUS_v001.oef
and as verified with ibex_orbit.
There are two star tracker outages. The first outage overlaps with Orbit 518 and ends around 16Re ascending. The second outage begins two days before Apogee and runs for 3 days.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file,
IBEX_Orbit519_Contacts.txt,
for all contacts (3) and reset master timer in Orbit 517.
We are doing battery cell balancing this orbit and the balancing commands are correct and offset by enough time from other commands.
The sun precession maneuver at perigee of orbit 518 left us pointing in safe directions for the orbit 519 arc A ascending and descending sequences:
ibex_rotate -o -r +338.390 -d -9.066 -w ibex-sun -t 2021/02:25:22:52:48
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. +338.976 Decl. -8.861 (ibex-sun)
error is R.A. +0.586 Decl. +0.205
for a total 0.614 deg
ibex_rotate -o -r +338.390 -d -9.066 -w ibex-sun -t 2021/03:02:00:43:01
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. +342.896 Decl. -7.251 (ibex-sun)
error is R.A. +4.506 Decl. +1.815
for a total 4.815 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 +342.942 -d -7.231 -w ibex-sun -t 2021/03:02:01:56:18
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.948405,-0.291007,-0.125870
which is R.A. +342.942 Decl. -7.231
missing R.A. +342.942 Decl. -7.231 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +342.942 -d -7.231 -w ibex-sun -t 2021/03:02:03:28:05
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.948405,-0.291007,-0.125870
which is R.A. +342.942 Decl. -7.231
missing R.A. +343.001 Decl. -7.206 (ibex-sun)
error is R.A. +0.059 Decl. +0.025
for a total 0.064 deg
ibex_rotate -o -r +342.942 -d -7.231 -w ibex-sun -t 2021/03:06:05:20:59
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.948405,-0.291007,-0.125870
which is R.A. +342.942 Decl. -7.231
missing R.A. +346.678 Decl. -5.692 (ibex-sun)
error is R.A. +3.736 Decl. +1.539
for a total 4.018 deg
The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 520 apogee:
ibex_rotate -o -u 0.974523,-0.201548,-0.098399 -w ibex-sun -t 2021/03:06:09:33:55
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. +346.842 Decl. -5.632 (ibex-sun)
error is R.A. +1.473 Decl. +0.015
for a total 1.465 deg
ibex_rotate -o -u 0.974523,-0.201548,-0.098399 -w ibex-sun -t 2021-03-11T02:25:33
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. +351.312 Decl. -3.732 (ibex-sun)
error is R.A. +2.997 Decl. +1.915
for a total 3.548 deg
Lo Normal mode for the entire orbit.
There is no overlap with orbit 518 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-10 at 16:21
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 #519 ATS Approval (25 Feb – 06 Mar 21)
Caution - External Email
All,
Attached are the planning files for Orbit #519
Please respond to this thread with comments and approvals.
Approvals are required by COB on 15 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 - 2021/03:02:01:41:18
1. Battery Balancing this orbit
Begin 2021/03:06:14:00:00– End 2021/03:06:15:30:00
1. # Orbit# 517 Reset Master Timer - 2021/02:16:16:15:00
1. Command Load Constraint Violation Report (CCVR)
IBEX_2021_056_o0519a_v001.ccvr
# Input files: 1
# IBEX_2021_056o0519a_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 2021/02/25 19:45:58 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2021/03/02 02:58:05 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 01D703BE.70346330]
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