[Isocops] IBEX Orbit #604 ATS Approval (09 - 18 Apr 2023)

Tue Mar 28 11:13:30 EDT 2023

Hi all,
I have looked at the orbit 0604 ATS file, IBEX_2023_099_o0604a_v001.scr and I approve.

The constraint violations in IBEX_2023_099_o0604a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2023_099_o0604a_v001.scr match those in the STF, IBEX_2023_099_o0604a_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_099_o0604a_v001.oef and as verified with ibex_orbit.

There is 1 star tracker outage this orbit. It lasts for ~8.8 hours and ends ~.8 hours before the perigee maneuver.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit604_Contacts.txt for all contacts (3).

No Battery Balancing this orbit.

The Inertial maneuver at perigee of orbit 0603 left us pointing in safe directions for the orbit 0604 arc A ascending and descending sequences:

ibex_rotate -o -u 0.957653,0.267634,0.106177 -w ibex-sun -t 2023/04:09:21:11:42
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.957653,+0.267634,+0.106177
which is     R.A.  +15.614 Decl.  +6.095
missing      R.A.  +17.918 Decl.  +7.575 (ibex-sun)
error is     R.A.   +2.304 Decl.  +1.480
for a total  2.724 deg

ibex_rotate -o -u 0.957653,0.267634,0.106177 -w ibex-sun -t 2023/04:13:12:29:17
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.957653,+0.267634,+0.106177
which is     R.A.  +15.614 Decl.  +6.095
missing      R.A.  +21.343 Decl.  +8.972 (ibex-sun)
error is     R.A.   +5.729 Decl.  +2.877
for a total  6.366 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 0.932664,0.334824,0.13428 -w ibex-sun -t 2023/04:13:14:12:25
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.932664,+0.334824,+0.134280
which is     R.A.  +19.748 Decl.  +7.717
missing      R.A.  +21.409 Decl.  +8.999 (ibex-sun)
error is     R.A.   +1.661 Decl.  +1.282
for a total  2.085 deg

ibex_rotate -o -u 0.932664,0.334824,0.13428 -w ibex-sun -t 2023/04:13:15:47:31
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.932664,+0.334824,+0.134280
which is     R.A.  +19.748 Decl.  +7.717
missing      R.A.  +21.471 Decl.  +9.025 (ibex-sun)
error is     R.A.   +1.723 Decl.  +1.308
for a total  2.148 deg

ibex_rotate -o -u 0.932664,0.334824,0.13428 -w ibex-sun -t 2023/04:18:02:50:06
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.932664,+0.334824,+0.134280
which is     R.A.  +19.748 Decl.  +7.717
missing      R.A.  +25.543 Decl. +10.604 (ibex-sun)
error is     R.A.   +5.795 Decl.  +2.887
for a total  6.408 deg

The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0605 apogee:

ibex_rotate -o -u 0.901235,0.401086,0.164032 -w ibex-sun -t 2023/04:18:11:51:40
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.901235,+0.401086,+0.164032
which is     R.A.  +23.991 Decl.  +9.441
missing      R.A.  +25.874 Decl. +10.711 (ibex-sun)
error is     R.A.   +1.883 Decl.  +1.270
for a total  2.247 deg

ibex_rotate -o -u 0.901235,0.401086,0.164032 -w ibex-sun -t 2023-04-23T06:06:26
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.901235,+0.401086,+0.164032
which is     R.A.  +23.991 Decl.  +9.441
missing      R.A.  +30.384 Decl. +12.381 (ibex-sun)
error is     R.A.   +6.393 Decl.  +2.940
for a total  6.931 deg

There is no overlap with orbit 0603 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: Sunday, March 26, 2023 at 09:59
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 #604 ATS Approval (09 - 18 Apr 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 #604.  Please respond to this thread with comments and approvals.
Approvals are required by COB, 29 Mar 2023

Please note the following:

1.       No Battery Balancing this orbit

2.       Command Load Constraint Violation Report (CCVR)
IBEX_2023_099_o0604a_v001.ccvr
# Input files:         1
#   IBEX_2023_099_o0604a_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 2023/04/09 19:05:24 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
             transition to science mode at 2023/04/13 15:17:31 UTC

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

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.sr.unh.edu/pipermail/isocops/attachments/20230328/a9fb7be8/attachment-0001.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: IBEX-Command-Approval-Checklist-Rev17_0604_CEW.docx
Type: application/vnd.openxmlformats-officedocument.wordprocessingml.document
Size: 47333 bytes
Desc: IBEX-Command-Approval-Checklist-Rev17_0604_CEW.docx
URL: <https://lists.sr.unh.edu/pipermail/isocops/attachments/20230328/a9fb7be8/IBEX-Command-Approval-Checklist-Rev17_0604_CEW-0001.docx>