[Isocops] IBEX Orbit #650 ATS Approval (June 02 - 10, 2024)
Carol Weaver
Carol.Weaver at unh.edu
Thu May 23 14:31:29 EDT 2024
Hi all,
I have looked at the orbit 0650 ATS file, IBEX_2024_153_o0650a_v001.scr and I approve.
The constraint violations in IBEX_2024_153_o0650a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands and a battery drop contraint that is likely due to a model error. The violations are acceptable.
The PL commands in IBEX_2024_153_o0650a_v001.scr match those in the STF, IBEX_2024_153_o0650a_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_2024_153_o0650a_v001.oef and as verified with ibex_orbit.
There is 1 star tracker outage this orbit. Outage begins at 2024-06-10 20:25:10 and lasts for 4.9 hours.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit650_Contacts.txt for all contacts (3).
Battery Balancing is 90 minutes long, more than 2 hours away from payload descending macros, and more than 15 minutes away from a maneuver.
The Inertial maneuver at perigee of orbit 0649 left us pointing in safe directions for the orbit 0650 arc A ascending and descending sequences:
ibex_rotate -o -u 0.355024,0.861268,0.36356 -w ibex-sun -t 2024/06:02:08:19:08
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.355024,+0.861268,+0.363560
which is R.A. +67.598 Decl. +21.319
missing R.A. +70.420 Decl. +22.198 (ibex-sun)
error is R.A. +2.822 Decl. +0.879
for a total 2.764 deg
ibex_rotate -o -u 0.355024,0.861268,0.36356 -w ibex-sun -t 2024/06:05:21:29:44
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.355024,+0.861268,+0.363560
which is R.A. +67.598 Decl. +21.319
missing R.A. +74.062 Decl. +22.644 (ibex-sun)
error is R.A. +6.464 Decl. +1.325
for a total 6.138 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 0.284549,0.883406,0.372324 -w ibex-sun -t 2024/06:05:23:12:52
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.284549,+0.883406,+0.372324
which is R.A. +72.146 Decl. +21.859
missing R.A. +74.137 Decl. +22.653 (ibex-sun)
error is R.A. +1.991 Decl. +0.794
for a total 2.006 deg
ibex_rotate -o -u 0.284549,0.883406,0.372324 -w ibex-sun -t 2024/06:06:00:47:58
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.284549,+0.883406,+0.372324
which is R.A. +72.146 Decl. +21.859
missing R.A. +74.206 Decl. +22.660 (ibex-sun)
error is R.A. +2.060 Decl. +0.801
for a total 2.068 deg
ibex_rotate -o -u 0.284549,0.883406,0.372324 -w ibex-sun -t 2024/06:10:09:57:07
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.284549,+0.883406,+0.372324
which is R.A. +72.146 Decl. +21.859
missing R.A. +78.810 Decl. +23.056 (ibex-sun)
error is R.A. +6.664 Decl. +1.197
for a total 6.273 deg
The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0651 apogee:
ibex_rotate -o -u 0.210033,0.900571,0.380602 -w ibex-sun -t 2024/06:10:11:58:50
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.210033,+0.900571,+0.380602
which is R.A. +76.872 Decl. +22.371
missing R.A. +78.896 Decl. +23.059 (ibex-sun)
error is R.A. +2.024 Decl. +0.688
for a total 1.990 deg
ibex_rotate -o -u 0.210033,0.900571,0.380602 -w ibex-sun -t 2024-06-15T08:42:24
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.210033,+0.900571,+0.380602
which is R.A. +76.872 Decl. +22.371
missing R.A. +83.860 Decl. +23.338 (ibex-sun)
error is R.A. +6.988 Decl. +0.967
for a total 6.511 deg
There is no overlap with orbit 0649 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: Monday, May 20, 2024 at 15:28
To: Carol Weaver <carol.weaver at unh.edu>, Chubin, Eric [US] (SP) <Eric.Chubin at ngc.com>, David Heirtzler <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>, kwfairchild at gmail.com <kwfairchild at gmail.com>, Kenneth Fairchild <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 #650 ATS Approval (June 02 - 10, 2024)
CAUTION: This email originated from outside of the University System. Do not click links or open attachments unless you recognize the sender and know the content is safe.
All,
Attached are the planning files for Orbit #650. Please respond to this thread with comments and approvals. Approvals for the Orbit 650 ATS are required by 1700 , 23 May 2024.
Please note the following:
Battery Balancing
Eclipse Flag True: 2024/06/10 21:00:00
Eclipse Flag False: 2024/06/10 22:30:00
Command Load Constraint Violation Report (CCVR)
IBEX_2024_153_o0650a_v001.ccvr
# Input files: 1
# IBEX_2024_153_o0650a_v001.scr
==========================
HARD CONSTRAINT VIOLATIONS
==========================
NO VIOLATIONS.
==========================
SOFT CONSTRAINT VIOLATION
==========================
I saw this violation IBX-CLC-015. I looked for any small eclipses or close transmitter times. We never drop to zero. I can’t explain why this is flagging other than maybe an MPS miscalculation.
IBX-CLC-015: Battery charge falls below minimum from 2024/06/02 04:43:00 UTC -
2024/06/02 14:04:00 UTC. Lowest charge level is 3736.960000
watt-minutes during this interval.
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2024/06/02 07:01:28 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2024/06/06 00:17:58 UTC
==============
OTHER MESSAGES
==============
NO MESSAGES.
Timothy E.Perry
CRS IBEX OCO-2
Mission Operations
timothy.perry at ngc.com<mailto:timothy.perry at ngc.com>
Office (703) 406-5976
IBEX MOC (703)404-7470
Cell (301) 606-1430
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