[Isocops] IBEX Orbit #578 ATS Appoval (15 – 25 Aug 2022)

Fri Aug 5 11:59:04 EDT 2022

Hi all,
I have looked at the orbit 0578 ATS file, IBEX_2022_227_o0578a_v001.scr and I approve.

The constraint violations in IBEX_2022_227_o0578a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2022_227_o0578a_v001.scr match those in the STF, IBEX_2022_227_o0578a_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_227_o0578a_v001.oef and as verified with ibex_orbit.

No star tracker outages this orbit.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit578_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 0577 left us pointing in safe directions for the orbit 0578 arc A ascending and descending sequences:

ibex_rotate -o -u -0.769676,0.589292,0.245629 -w ibex-sun -t 2022/08:16:04:47:23
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.769676,+0.589292,+0.245629
which is     R.A. +142.561 Decl. +14.219
missing      R.A. +145.366 Decl. +13.822 (ibex-sun)
error is     R.A.   +2.805 Decl.  +0.397
for a total  2.750 deg

ibex_rotate -o -u -0.769676,0.589292,0.245629 -w ibex-sun -t 2022/08:20:00:19:57
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.769676,+0.589292,+0.245629
which is     R.A. +142.561 Decl. +14.219
missing      R.A. +148.812 Decl. +12.660 (ibex-sun)
error is     R.A.   +6.251 Decl.  +1.559
for a total  6.276 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 -0.816774,0.533241,0.220306 -w ibex-sun -t 2022/08:20:02:03:05
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.816774,+0.533241,+0.220306
which is     R.A. +146.861 Decl. +12.727
missing      R.A. +148.879 Decl. +12.637 (ibex-sun)
error is     R.A.   +2.018 Decl.  +0.090
for a total  1.971 deg

ibex_rotate -o -u -0.816774,0.533241,0.220306 -w ibex-sun -t 2022/08:20:03:38:11
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.816774,+0.533241,+0.220306
which is     R.A. +146.861 Decl. +12.727
missing      R.A. +148.941 Decl. +12.617 (ibex-sun)
error is     R.A.   +2.080 Decl.  +0.110
for a total  2.032 deg

ibex_rotate -o -u -0.816774,0.533241,0.220306 -w ibex-sun -t 2022/08:24:19:12:40
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.816774,+0.533241,+0.220306
which is     R.A. +146.861 Decl. +12.727
missing      R.A. +153.362 Decl. +11.010 (ibex-sun)
error is     R.A.   +6.501 Decl.  +1.717
for a total  6.589 deg

The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0579 apogee:

 ibex_rotate -o -u -0.859636,0.472257,0.194936 -w ibex-sun -t 2022/08:24:23:21:06
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. +153.519 Decl. +10.944 (ibex-sun)
error is     R.A.   +2.302 Decl.  +0.297
for a total  2.279 deg

ibex_rotate -o -u -0.859636,0.472257,0.194936 -w ibex-sun -t 2022-08-29T17:32:07
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. +157.741 Decl.  +9.340 (ibex-sun)
error is     R.A.   +6.524 Decl.  +1.901
for a total  6.695 deg

There is no overlap with orbit 0577 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: Wednesday, 2022-August-3 at 12:29
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>, 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 #578 ATS Appoval (15 – 25 Aug 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 #578. Please respond to this thread with comments and approvals.
Approvals are required by COB, 05 Aug 2022

Please note the following:

  1.  No Battery Balancing this orbit

Begin 2022/08/25 03:00:00– End 2022/08/25 04:30:00

  1.  Command Load Constraint Violation Report (CCVR)

IBEX_2022_227_o0578a_v001.ccvr
# Input files:         1
#   IBEX_2022_227_o0578a_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 2022/08/16 01:29:02 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
             transition to science mode at 2022/08/20 03:08:11 UTC

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

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