[Isocops] IBEX Orbit #589 ATS Approval (26 Nov – 05 Dec 2022)

Mon Nov 14 15:15:02 EST 2022

Hi all,

This ATS includes the new Lo MCP voltage commands.
I have looked at the orbit 0589 ATS file, IBEX_2022_329_o0589a_v001.scr and I approve.

The constraint violations in IBEX_2022_329_o0589a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2022_329_o0589a_v001.scr match those in the STF, IBEX_2022_329_o0589a_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_329_o0589a_v001.oef and as verified with ibex_orbit.

There is 1 star tracker outage this orbit.  It lasts for ~92 hours and occurs over apogee, resulting in a sun maneuver.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit589_Contacts.txt for all contacts (3).

No Battery Balancing this orbit.

The Inertial maneuver at perigee of orbit 0588 left us pointing in safe directions for the orbit 0589 arc A ascending and descending sequences:

ibex_rotate -o -u -0.491824,-0.795244,-0.354536 -w ibex-sun -t 2022/11:26:02:21:46
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.491824,-0.795244,-0.354536
which is     R.A. +238.265 Decl. -20.765
missing      R.A. +241.491 Decl. -20.874 (ibex-sun)
error is     R.A.   +3.226 Decl.  +0.109
for a total  3.017 deg

ibex_rotate -o -u -0.491824,-0.795244,-0.354536 -w ibex-sun -t 2022/11:30:02:22:26
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.491824,-0.795244,-0.354536
which is     R.A. +238.265 Decl. -20.765
missing      R.A. +245.736 Decl. -21.551 (ibex-sun)
error is     R.A.   +7.471 Decl.  +0.786
for a total  7.011 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 +245.815 -d -21.563 -w ibex-sun -t 2022/11:30:04:10:34
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.381012,-0.848384,-0.367524
which is     R.A. +245.815 Decl. -21.563
missing      R.A. +245.815 Decl. -21.563 (ibex-sun)
error is     R.A.   +0.000 Decl.  +0.000
for a total  0.001 deg

ibex_rotate -o -r +245.815 -d -21.563 -w ibex-sun -t 2022/11:30:05:40:40
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.381012,-0.848384,-0.367524
which is     R.A. +245.815 Decl. -21.563
missing      R.A. +245.881 Decl. -21.572 (ibex-sun)
error is     R.A.   +0.066 Decl.  +0.009
for a total  0.062 deg

ibex_rotate -o -r +245.815 -d -21.563 -w ibex-sun -t 2022/12:04:04:52:09
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.381012,-0.848384,-0.367524
which is     R.A. +245.815 Decl. -21.563
missing      R.A. +250.138 Decl. -22.163 (ibex-sun)
error is     R.A.   +4.323 Decl.  +0.600
for a total  4.056 deg

The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0590 apogee:

ibex_rotate -o -u -0.317035,-0.866481,-0.385616 -w ibex-sun -t 2022/12:04:07:29:35
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.317035,-0.866481,-0.385616
which is     R.A. +249.903 Decl. -22.682
missing      R.A. +250.262 Decl. -22.183 (ibex-sun)
error is     R.A.   +0.359 Decl.  +0.499
for a total  0.599 deg

ibex_rotate -o -u -0.317035,-0.866481,-0.385616 -w ibex-sun -t 2022-12-09T05:57:52
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.317035,-0.866481,-0.385616
which is     R.A. +249.903 Decl. -22.682
missing      R.A. +255.687 Decl. -22.769 (ibex-sun)
error is     R.A.   +5.784 Decl.  +0.087
for a total  5.335 deg

There is an overlap with orbit 0588 commands to turn off the transmitter from the last contact in 0588. This is acceptable.

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, 2022-November-13 at 20:41
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 #589 ATS Approval (26 Nov – 05 Dec 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 #589. Please respond to this thread with comments and approvals.
Approvals are required by COB, 15 Nov 2022

Please note the following:

  1.  Apogee Sun Maneuver – 2022/11:30:03:55:34

2.       No Battery Balancing this orbit

3.       Command Load Constraint Violation Report (CCVR)
IBEX_2022_329_o0589a_v001.ccvr
# Input files:         1
#   IBEX_2022_329_o0589a_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 2022/11/26 00:23:15 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
             transition to science mode at 2022/11/30 05:10:40 UTC

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

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