[Isocops] IBEX Orbit #552 ATS Approval (22 Dec 2021 - 01 Jan 2022)
Carol Weaver
Carol.Weaver at unh.edu
Fri Dec 10 11:01:05 EST 2021
Hi all,
The angle at descending after the apogee Sun Maneuver is 4.195 deg.
I have looked at the orbit 0552 ATS file, IBEX_2021_356_o0552a_v001.scr and I approve.
The constraint violations in IBEX_2021_356_o0552a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands and 2 planned transmissions that amount to greater than the maximum transmission time. The violations are acceptable.
The PL commands in IBEX_2021_356_o0552a_v001.scr match those in the STF, IBEX_2021_356_o0552a_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_356_o0552a_v001.oef and as verified with ibex_orbit.
There is 1 star tracker outage this orbit lasting ~77 hours and overlaps with the apogee maneuver.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit552_Contacts.txt for all contacts (4).
Battery Balancing is 90 minutes long, more than 2 hours away from payload descending macros, and more than 1 hour away from maneuver.
The inertial maneuver at perigee of orbit 0551 left us pointing in safe directions for the orbit 0552 arc A ascending and descending sequences:
ibex_rotate -o -u 0.032647,-0.912948,-0.406769 -w ibex-sun -t 2021/12:23:01:18:47
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.032647,-0.912948,-0.406769
which is R.A. +272.048 Decl. -24.002
missing R.A. +271.244 Decl. -23.451 (ibex-sun)
error is R.A. +0.804 Decl. +0.551
for a total 0.920 deg
ibex_rotate -o -u 0.032647,-0.912948,-0.406769 -w ibex-sun -t 2021/12:27:03:41:53
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.032647,-0.912948,-0.406769
which is R.A. +272.048 Decl. -24.002
missing R.A. +275.792 Decl. -23.317 (ibex-sun)
error is R.A. +3.744 Decl. +0.685
for a total 3.497 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 +275.874 -d -23.312 -w ibex-sun -t 2021/12:27:05:30:01
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.093986,-0.913542,-0.395738
which is R.A. +275.874 Decl. -23.312
missing R.A. +275.874 Decl. -23.312 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
bex_rotate -o -r +275.874 -d -23.312 -w ibex-sun -t 2021/12:27:07:00:07
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.093986,-0.913542,-0.395738
which is R.A. +275.874 Decl. -23.312
missing R.A. +275.942 Decl. -23.309 (ibex-sun)
error is R.A. +0.068 Decl. +0.003
for a total 0.062 deg
ibex_rotate -o -r +275.874 -d -23.312 -w ibex-sun -t 2021/12:31:09:38:25
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.093986,-0.913542,-0.395738
which is R.A. +275.874 Decl. -23.312
missing R.A. +280.431 Decl. -23.076 (ibex-sun)
error is R.A. +4.557 Decl. +0.236
for a total 4.195 deg
The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0553 apogee:
ibex_rotate -o -u 0.194222,-0.895965,-0.399405 -w ibex-sun -t 2021/12:31:13:04:57
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.194222,-0.895965,-0.399405
which is R.A. +282.231 Decl. -23.541
missing R.A. +280.597 Decl. -23.071 (ibex-sun)
error is R.A. +1.634 Decl. +0.470
for a total 1.572 deg
ibex_rotate -o -u 0.194222,-0.895965,-0.399405 -w ibex-sun -t 2022-01-05T09:12:22
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.194222,-0.895965,-0.399405
which is R.A. +282.231 Decl. -23.541
missing R.A. +286.001 Decl. -22.608 (ibex-sun)
error is R.A. +3.770 Decl. +0.933
for a total 3.592 deg
There is no overlap with orbit 0551 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: Thursday, 2021-December-9 at 13:47
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>, fair-play at comcast.net <fair-play at comcast.net>, 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 #552 ATS Approval (22 Dec 2021 - 01 Jan 2022)
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 #552. Please respond to this thread with comments and approvals.
Approvals are required by COB, 12 Dec 2021
Please note the following:
1. Apogee Sun Maneuver - 12/27/2021 05:15:01
1. Battery Balancing this orbit
Begin 12/31/2021 19:00:00– End 12/31/2021 20:30:00
1. Command Load Constraint Violation Report (CCVR)
# Filename: IBEX_2021_356_o0552a_v001.ccvr
# File type: Command Load Constraint Violation Report (CCVR)
#
# Create time: 2021/343.164915
# Plan period start: 2021/356.220000
# Plan period stop: 2022/001.023000
# Default time format: UTC
#
# Input files: 1
# IBEX_2021_35_o0552a_v001.scr
==========================
HARD CONSTRAINT VIOLATIONS
==========================
NO VIOLATIONS.
==========================
SOFT CONSTRAINT VIOLATIONS
==========================
These IBX-CLC-006 soft constraint violations areacceptable
IBX-CLC-006: Planned transmission at 2021/12/22 22:28:00 UTC - 2021/12/22
23:32:00 UTC is followed by one or more additional transmissions
which, when combined, exceed the maximum transmission time of 5400
seconds within a 18000-second window (total planned transmission
time this window is 7680.000 seconds)
IBX-CLC-006: Planned transmission at 2021/12/23 01:58:00 UTC - 2021/12/23
03:02:00 UTC is preceded by one or more additional transmissions
which, when combined, exceed the maximum transmission time of 5400
seconds within a 18000-second window (total planned transmission
time this window is 7680.000 seconds)
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2021/12/22 22:45:03 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2021/12/27 06:30:07 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 01D7EDB5.38A5C350]
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