[Isocops] IBEX Orbit #571 ATS Approval (13 – 22 June 2022)

Fri Jun 3 11:49:11 EDT 2022

Hi all,
I have looked at the orbit 0571 ATS file, IBEX_2022_164_o0571a_v001.scr and I approve.

The constraint violations in IBEX_2022_164_o0571a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2022_164_o0571a_v001.scr match those in the STF, IBEX_2022_164_o0571a_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_164_o0571a_v001.oef and as verified with ibex_orbit.

There are 2 star tracker outages this orbit. The first one is ~16.8 hours overlapping with perigee for Orbit 570. The second outage overlaps with perigee for Orbit 571 and lasts for ~7.5 hours.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit571_Contacts.txt for all contacts (3).

No Battery Balancing this orbit.

The Sun maneuver at perigee of orbit 0570 left us pointing in safe directions for the orbit 0571 arc A ascending and descending sequences:

ibex_rotate -o -r +81.465 -d +23.218 -w ibex-sun -t 2022/06:14:06:51:40
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.136394,+0.908834,+0.394231
which is     R.A.  +81.465 Decl. +23.218
missing      R.A.  +82.260 Decl. +23.225 (ibex-sun)
error is     R.A.   +0.795 Decl.  +0.007
for a total  0.731 deg

ibex_rotate -o -r +81.465 -d +23.218 -w ibex-sun -t 2022/06:17:18:23:59
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.136394,+0.908834,+0.394231
which is     R.A.  +81.465 Decl. +23.218
missing      R.A.  +85.874 Decl. +23.388 (ibex-sun)
error is     R.A.   +4.409 Decl.  +0.170
for a total  4.053 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 0.09824,0.916981,0.386647 -w ibex-sun -t 2022/06:17:20:07:07
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.098240,+0.916980,+0.386647
which is     R.A.  +83.885 Decl. +22.746
missing      R.A.  +85.950 Decl. +23.391 (ibex-sun)
error is     R.A.   +2.065 Decl.  +0.645
for a total  2.007 deg

ibex_rotate -o -u 0.09824,0.916981,0.386647 -w ibex-sun -t 2022/06:17:21:42:13
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.098240,+0.916980,+0.386647
which is     R.A.  +83.885 Decl. +22.746
missing      R.A.  +86.020 Decl. +23.394 (ibex-sun)
error is     R.A.   +2.135 Decl.  +0.648
for a total  2.068 deg

ibex_rotate -o -u 0.09824,0.916981,0.386647 -w ibex-sun -t 2022/06:22:05:22:28
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.098240,+0.916980,+0.386647
which is     R.A.  +83.885 Decl. +22.746
missing      R.A.  +90.577 Decl. +23.452 (ibex-sun)
error is     R.A.   +6.692 Decl.  +0.706
for a total  6.196 deg

The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0572 apogee:

ibex_rotate -o -u 0.023099,0.920807,0.389333 -w ibex-sun -t 2022/06:22:08:07:42
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.023099,+0.920807,+0.389333
which is     R.A.  +88.563 Decl. +22.913
missing      R.A.  +90.692 Decl. +23.447 (ibex-sun)
error is     R.A.   +2.129 Decl.  +0.534
for a total  2.029 deg

ibex_rotate -o -u 0.023099,0.920807,0.389333 -w ibex-sun -t 2022-06-27T04:53:53
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.023099,+0.920807,+0.389333
which is     R.A.  +88.563 Decl. +22.913
missing      R.A.  +95.680 Decl. +23.347 (ibex-sun)
error is     R.A.   +7.117 Decl.  +0.434
for a total  6.558 deg

There is no overlap with orbit 0570 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, 2022-May-31 at 15:06
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 #571 ATS Approval (13 – 22 June 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 #571. Please respond to this thread with comments and approvals.
Approvals are required by 1800, 04 June 2022

Please note the following:

  1.  No Battery Balancing this orbit
  2.

  3.   Command Load Constraint Violation Report (CCVR)
IBEX_2022_164_o0571a_v001.ccvr
# Input files:         1
#   IBEX_2022_164_o0571a_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 2022/06/14 04:57:21 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
             transition to science mode at 2022/06/17 21:12:13 UTC

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

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