[Isocops] IBEX Orbit #659 ATS Approval (August 22 - 31, 2024)

Mon Aug 12 13:17:57 EDT 2024

Hi all,
I have looked at the orbit 0659 ATS file, IBEX_2024_234_o0659a_v001.scr and I approve.

The constraint violations in IBEX_2024_234_o0659a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2024_234_o0659a_v001.scr match those in the STF, IBEX_2024_234_o0659a_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_2024_234_o0659a_v001.oef and as verified with ibex_orbit.

There is 1 star tracker outage this orbit. Outage begins at 2024-08-22 03:11:54 and lasts for 7.4 hours.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit659_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 0658 left us pointing in safe directions for the orbit 0659 arc A ascending and descending sequences:

ibex_rotate -o -u -0.832924,0.511237,0.211837 -w ibex-sun -t 2024/08:22:04:50:59
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.832924,+0.511237,+0.211837
which is     R.A. +148.459 Decl. +12.230
missing      R.A. +151.376 Decl. +11.713 (ibex-sun)
error is     R.A.   +2.917 Decl.  +0.517
for a total  2.900 deg

ibex_rotate -o -u -0.832924,0.511237,0.211837 -w ibex-sun -t 2024/08:25:21:19:20
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.832924,+0.511237,+0.211837
which is     R.A. +148.459 Decl. +12.230
missing      R.A. +154.666 Decl. +10.528 (ibex-sun)
error is     R.A.   +6.207 Decl.  +1.703
for a total  6.318 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 -0.873628,0.450218,0.184603 -w ibex-sun -t 2024/08:25:23:02:28
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.873628,+0.450218,+0.184603
which is     R.A. +152.736 Decl. +10.638
missing      R.A. +154.731 Decl. +10.504 (ibex-sun)
error is     R.A.   +1.995 Decl.  +0.134
for a total  1.966 deg

ibex_rotate -o -u -0.873628,0.450218,0.184603 -w ibex-sun -t 2024/08:26:00:37:34
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.873628,+0.450218,+0.184603
which is     R.A. +152.736 Decl. +10.638
missing      R.A. +154.792 Decl. +10.481 (ibex-sun)
error is     R.A.   +2.056 Decl.  +0.157
for a total  2.027 deg

ibex_rotate -o -u -0.873628,0.450218,0.184603 -w ibex-sun -t 2024/08:30:12:33:13
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.873628,+0.450218,+0.184603
which is     R.A. +152.736 Decl. +10.638
missing      R.A. +159.001 Decl.  +8.847 (ibex-sun)
error is     R.A.   +6.265 Decl.  +1.791
for a total  6.429 deg

The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0660 apogee:

ibex_rotate -o -u -0.908941,0.38601,0.157555 -w ibex-sun -t 2024/08:30:14:52:39
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.908941,+0.386010,+0.157555
which is     R.A. +156.990 Decl.  +9.065
missing      R.A. +159.093 Decl.  +8.807 (ibex-sun)
error is     R.A.   +2.103 Decl.  +0.258
for a total  2.094 deg

ibex_rotate -o -u -0.908941,0.38601,0.157555 -w ibex-sun -t 2024-09-04T14:04:02
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.908941,+0.386010,+0.157555
which is     R.A. +156.990 Decl.  +9.065
missing      R.A. +163.485 Decl.  +7.049 (ibex-sun)
error is     R.A.   +6.495 Decl.  +2.016
for a total  6.739 deg

There is no overlap with orbit 0658 commands.

Command Approval Checklist is attached.

Carol

--
Carol Weaver
University of New Hampshire
503-902-8492

From: Coca Gonzales, Andrea [US] (SP) <Andrea.CocaGonzales at ngc.com>
Date: Friday, August 9, 2024 at 15:06
To: Perry, Timothy E [US] (SP) <Timothy.Perry at ngc.com>, Carol Weaver <carol.weaver at unh.edu>, Chubin, Eric [US] (SP) <Eric.Chubin at ngc.com>, Coca Gonzales, Andrea [US] (SP) <Andrea.CocaGonzales at ngc.com>, David Heirtzler <David.Heirtzler at unh.edu>, ADS-IBEX at l3harris.com <ADS-IBEX at l3harris.com>, IBEXOPS at gmail.com <IBEXOPS at gmail.com>, isocops at lists.sr.unh.edu <isocops at lists.sr.unh.edu>, kwfairchild at gmail.com <kwfairchild at gmail.com>, Kenneth Fairchild <Ken.Fairchild at unh.edu>, angoldconsulting at earthlink.net <angoldconsulting at earthlink.net>, Paul.Janzen at mso.umt.edu <Paul.Janzen at mso.umt.edu>, Tyler, Ryan S [US] (SP) <Ryan.Tyler at ngc.com>, Wynn, Reese [US] (SP) <Reese.Wynn at ngc.com>, Wesley, Sheral R [US] (SP) <Sheral.Wesley at ngc.com>
Subject: IBEX Orbit #659 ATS Approval (August 22 - 31, 2024)
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 #659. Please respond to this thread with comments and approvals. Approvals for the Orbit 659 ATS are required by COB, 11 August 2024.

Please note the following:

Battery Balancing
Eclipse Flag True: 2024/08:31:00:30:00
Eclipse Flag False: 2024/08:31:02:00:00

Command Load Constraint Violation Report (CCVR)
IBEX_2024_234_o0659a_v001.ccvr
# Input files:         1
#   IBEX_2024_234_o0659a_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 2024/08/22 03:19:28 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
             transition to science mode at 2024/08/26 00:07:34 UTC

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

Andrea Coca Gonzales | Associate Engineer Satellite Systems | MEV | ICESat-2 | TESS | IBEX
Northrop Grumman Corporation  |  Adelante Member Engagement Lead  |  Space Systems
Andrea.CocaGonzales at ngc.com<mailto:Andrea.CocaGonzales at ngc.com>

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