[Isocops] IBEX Orbit #598 ATS Approval (14 - 23 Feb 2023)

Sat Feb 4 10:30:46 EST 2023

Hi all,
I have looked at the orbit 0598 ATS file, IBEX_2023_045_o0598a_v001.scr and I approve.

The constraint violations in IBEX_2023_045_o0598a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2023_045_o0598a_v001.scr match those in the STF, IBEX_2023_045_o0598a_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_2023_045_o0598a_v001.oef and as verified with ibex_orbit.

No star tracker outage this orbit.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit598_Contacts.txt for all contacts (3).

No Battery Balancing this orbit

The Inertial maneuver at perigee of orbit 0597 left us pointing in safe directions for the orbit 0598 arc A ascending and descending sequences:

ibex_rotate -o -u 0.830284,-0.507285,-0.230848 -w ibex-sun -t 2023/02:14:17:58:22
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.830284,-0.507285,-0.230848
which is     R.A. +328.576 Decl. -13.347
missing      R.A. +327.720 Decl. -13.056 (ibex-sun)
error is     R.A.   +0.856 Decl.  +0.291
for a total  0.882 deg

ibex_rotate -o -u 0.830284,-0.507285,-0.230848 -w ibex-sun -t 2023/02:18:05:30:25
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.830284,-0.507285,-0.230848
which is     R.A. +328.576 Decl. -13.347
missing      R.A. +331.201 Decl. -11.787 (ibex-sun)
error is     R.A.   +2.625 Decl.  +1.560
for a total  3.000 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 0.871664,-0.445957,-0.203283 -w ibex-sun -t 2023/02:18:07:13:33
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.871664,-0.445957,-0.203283
which is     R.A. +332.905 Decl. -11.729
missing      R.A. +331.270 Decl. -11.761 (ibex-sun)
error is     R.A.   +1.635 Decl.  +0.032
for a total  1.601 deg

ibex_rotate -o -u 0.871664,-0.445957,-0.203283 -w ibex-sun -t 2023/02:18:08:48:39
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.871664,-0.445957,-0.203283
which is     R.A. +332.905 Decl. -11.729
missing      R.A. +331.334 Decl. -11.737 (ibex-sun)
error is     R.A.   +1.571 Decl.  +0.008
for a total  1.538 deg

ibex_rotate -o -u 0.871664,-0.445957,-0.203283 -w ibex-sun -t 2023/02:22:17:00:31
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.871664,-0.445957,-0.203283
which is     R.A. +332.905 Decl. -11.729
missing      R.A. +335.377 Decl. -10.222 (ibex-sun)
error is     R.A.   +2.472 Decl.  +1.507
for a total  2.856 deg

The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0599 apogee:

ibex_rotate -o -u 0.906699,-0.382874,-0.17693 -w ibex-sun -t 2023/02:22:19:56:25
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.906699,-0.382874,-0.176930
which is     R.A. +337.107 Decl. -10.191
missing      R.A. +335.491 Decl. -10.184 (ibex-sun)
error is     R.A.   +1.616 Decl.  +0.007
for a total  1.591 deg

ibex_rotate -o -u 0.906699,-0.382874,-0.17693 -w ibex-sun -t 2023-02-27T16:34:11
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.906699,-0.382874,-0.176930
which is     R.A. +337.107 Decl. -10.191
missing      R.A. +340.224 Decl.  -8.329 (ibex-sun)
error is     R.A.   +3.117 Decl.  +1.862
for a total  3.596 deg

There is no overlap with orbit 0597 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: Tuesday, January 31, 2023 at 14:29
To: Carol Weaver <carol.weaver at unh.edu>, Chubin, Eric [US] (SP) <Eric.Chubin at ngc.com>, David Heirtzler <David.Heirtzler at unh.edu>, IBEX FDG Group <ADS-IBEX at l3harris.com>, 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>, Kenneth Fairchild <Ken.Fairchild at unh.edu>, angoldconsulting <angoldconsulting at earthlink.net>, Paul Janzen <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 #598 ATS Approval (14 - 23 Feb 2023)
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 #598. Please respond to this thread with comments and approvals.
Approvals are required by COB, 04 Feb 2023

Please note the following:

1.       No Battery Balancing this orbit

2.       Command Load Constraint Violation Report (CCVR)
IBEX_2023_045_o0598a_v001.ccvr
# Input files:         1
#   IBEX_2023_045_o0598a_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 2023/02/14 15:56:30 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
             transition to science mode at 2023/02/18 08:18:39 UTC

==============
OTHER MESSAGES
==============
                NO MESSAGES
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