[Isocops] IBEX Orbit #579 ATS Approval (25 Aug – 03 Sept 2022)

Fri Aug 12 14:53:28 EDT 2022

Hi all,
I have looked at the orbit 0579 ATS file, IBEX_2022_237_o0579a_v001.scr and I approve.

The constraint violations in IBEX_2022_237_o0579a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2022_237_o0579a_v001.scr match those in the STF, IBEX_2022_237_o0579a_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_2022_237_o0579a_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_Orbit579_Contacts.txt for all contacts (4).

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 0578 left us pointing in safe directions for the orbit 0579 arc A ascending and descending sequences:

ibex_rotate -o -u -0.859636,0.472257,0.194936 -w ibex-sun -t 2022/08:25:12:20:47
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.859636,+0.472257,+0.194936
which is     R.A. +151.217 Decl. +11.241
missing      R.A. +153.993 Decl. +10.744 (ibex-sun)
error is     R.A.   +2.776 Decl.  +0.497
for a total  2.770 deg

ibex_rotate -o -u -0.859636,0.472257,0.194936 -w ibex-sun -t 2022/08:29:06:00:54
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.859636,+0.472257,+0.194936
which is     R.A. +151.217 Decl. +11.241
missing      R.A. +157.301 Decl.  +9.504 (ibex-sun)
error is     R.A.   +6.084 Decl.  +1.737
for a total  6.231 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 -0.896243,0.410824,0.167251 -w ibex-sun -t 2022/08:29:07:44:02
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.896243,+0.410824,+0.167251
which is     R.A. +155.374 Decl.  +9.628
missing      R.A. +157.366 Decl.  +9.480 (ibex-sun)
error is     R.A.   +1.992 Decl.  +0.148
for a total  1.970 deg

ibex_rotate -o -u -0.896243,0.410824,0.167251 -w ibex-sun -t 2022/08:29:09:19:08
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.896243,+0.410824,+0.167251
which is     R.A. +155.374 Decl.  +9.628
missing      R.A. +157.427 Decl.  +9.457 (ibex-sun)
error is     R.A.   +2.053 Decl.  +0.171
for a total  2.032 deg

ibex_rotate -o -u -0.896243,0.410824,0.167251 -w ibex-sun -t 2022/09:02:22:58:11
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.896243,+0.410824,+0.167251
which is     R.A. +155.374 Decl.  +9.628
missing      R.A. +161.702 Decl.  +7.761 (ibex-sun)
error is     R.A.   +6.328 Decl.  +1.867
for a total  6.528 deg

The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0580 apogee:

 ibex_rotate -o -u -0.927839,0.345687,0.140055 -w ibex-sun -t 2022/09:03:03:11:35
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.927839,+0.345687,+0.140055
which is     R.A. +159.566 Decl.  +8.051
missing      R.A. +161.863 Decl.  +7.689 (ibex-sun)
error is     R.A.   +2.297 Decl.  +0.362
for a total  2.304 deg

ibex_rotate -o -u -0.927839,0.345687,0.140055 -w ibex-sun -t 2022-09-07T21:29:09
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.927839,+0.345687,+0.140055
which is     R.A. +159.566 Decl.  +8.051
missing      R.A. +166.033 Decl.  +5.987 (ibex-sun)
error is     R.A.   +6.467 Decl.  +2.064
for a total  6.741 deg

There is no overlap with orbit 0578 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, 2022-August-11 at 12:24
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>, Nigel Angold <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 #579 ATS Approval (25 Aug – 03 Sept 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 #579. Please respond to this thread with comments and approvals.
Approvals are required by COB, 14 Aug 2022

Please note the following:

  1.  Battery Balancing this orbit
  2.  Begin 2022/09/03 06:00:00– End 2022/09/03 07:30:00

  1.  Command Load Constraint Violation Report (CCVR)
  2.  IBEX_2022_237_o0579a_v001.ccvr
# Input files:         1
#   IBEX_2022_237_o0579a_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 2022/08/25 08:57:18 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
             transition to science mode at 2022/08/29 08:49:08 UTC

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

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