[Isocops] IBEX Orbit #660 ATS Approval (August 31 – September 9, 2024)

Fri Aug 23 13:23:33 EDT 2024

Hi all,
I have looked at the orbit 0660 ATS file, IBEX_2024_244_o0660a_v002.scr and I approve.

The constraint violations in IBEX_2024_244_o0660a_v002.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2024_244_o0660a_v002.scr match those in the STF, IBEX_2024_244_o0660a_v004.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_244_o0660a_v002.oef and as verified with ibex_orbit.

There is 1 star tracker outage this orbit. Outage begins at 2024-08-31 11:54:32 and lasts for 11.4 hours.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit660_Contacts.txt for all contacts (2).

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 0659 left us pointing in safe directions for the orbit 0660 arc A ascending and descending sequences:

 ibex_rotate -o -u -0.908941,0.38601,0.157555 -w ibex-sun -t 2024/08:31:12:07:53
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. +159.885 Decl.  +8.460 (ibex-sun)
error is     R.A.   +2.895 Decl.  +0.605
for a total  2.925 deg

ibex_rotate -o -u -0.908941,0.38601,0.157555 -w ibex-sun -t 2024/09:04:02:30:56
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. +163.050 Decl.  +7.221 (ibex-sun)
error is     R.A.   +6.060 Decl.  +1.844
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 -0.938467,0.320614,0.128398 -w ibex-sun -t 2024/09:04:04:14:04
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.938467,+0.320614,+0.128398
which is     R.A. +161.138 Decl.  +7.377
missing      R.A. +163.115 Decl.  +7.196 (ibex-sun)
error is     R.A.   +1.977 Decl.  +0.181
for a total  1.969 deg

ibex_rotate -o -u -0.938467,0.320614,0.128398 -w ibex-sun -t 2024/09:04:05:49:10
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.938467,+0.320614,+0.128398
which is     R.A. +161.138 Decl.  +7.377
missing      R.A. +163.174 Decl.  +7.172 (ibex-sun)
error is     R.A.   +2.036 Decl.  +0.205
for a total  2.030 deg

ibex_rotate -o -u -0.938467,0.320614,0.128398 -w ibex-sun -t 2024/09:08:15:22:59
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.938467,+0.320614,+0.128398
which is     R.A. +161.138 Decl.  +7.377
missing      R.A. +167.234 Decl.  +5.489 (ibex-sun)
error is     R.A.   +6.096 Decl.  +1.888
for a total  6.344 deg

The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0661 apogee:

ibex_rotate -o -u -0.962119,0.253574,0.100136 -w ibex-sun -t 2024/09:08:17:32:00
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.962119,+0.253574,+0.100136
which is     R.A. +165.235 Decl.  +5.747
missing      R.A. +167.319 Decl.  +5.450 (ibex-sun)
error is     R.A.   +2.084 Decl.  +0.297
for a total  2.095 deg

ibex_rotate -o -u -0.962119,0.253574,0.100136 -w ibex-sun -t 2024-09-13T17:06:08
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.962119,+0.253574,+0.100136
which is     R.A. +165.235 Decl.  +5.747
missing      R.A. +171.698 Decl.  +3.606 (ibex-sun)
error is     R.A.   +6.463 Decl.  +2.141
for a total  6.787 deg

There is no overlap with orbit 0659 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, August 21, 2024 at 16:24
To: 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>, 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 #660 ATS Approval (August 31 – September 9, 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 #660. Please respond to this thread with comments and approvals. Approvals for the Orbit 660 ATS are required by COB, 25 August 2024.

Please note the following:

Battery Balancing
Eclipse Flag True: 2024/09/09 03:30:00
Eclipse Flag False: 2024/09/09 05:00:00

Command Load Constraint Violation Report (CCVR)
IBEX_2024_244_o0660a_v002.ccvr
# Input files:         1
#   IBEX_2024_244_o0660a_v002.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 2024/08/31 10:36:39 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
             transition to science mode at 2024/09/04 05:19:10 UTC

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

Timothy E.Perry
CRS IBEX OCO-2
Mission Operations
timothy.perry at ngc.com<mailto:timothy.perry at ngc.com>
Office (703) 406-5976
IBEX MOC (703)404-7470
Cell (301) 606-1430

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