[Isocops] IBEX Orbit #642 ATS Approval (March 21 - 31, 2024)

Fri Mar 8 12:03:51 EST 2024

Hi all,
I have looked at the orbit 0642 ATS file, IBEX_2024_081_o0642a_v001.scr and I approve.

The constraint violations in IBEX_2024_081_o0642a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2024_081_o0642a_v001.scr match those in the STF, IBEX_2024_081_o0642a_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_081_o0642a_v001.oef and as verified with ibex_orbit.

There are 3 star tracker outages this orbit. Outage 1 begins at 2024-03-21 11:10:00 and lasts for 17.8 hours. Outage 2 begins at 2024-03-27 08:03:08 and lasts for 37.2 hours. Outage 3 begins at 2024-03-30 03:24:54 and lasts for 8.1 hours.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit642_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 maneuve.

The Inertial maneuver at perigee of orbit 0641 left us pointing in safe directions for the orbit 0642 arc A ascending and descending sequences:

 ibex_rotate -o -u 0.99993,0.010454,-0.005515 -w ibex-sun -t 2024/03:21:22:34:23
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.999930,+0.010454,-0.005515
which is     R.A.   +0.599 Decl.  -0.316
missing      R.A.   +1.331 Decl.  +0.556 (ibex-sun)
error is     R.A.   +0.732 Decl.  +0.871
for a total  1.138 deg

ibex_rotate -o -u 0.99993,0.010454,-0.005515 -w ibex-sun -t 2024/03:25:14:12:16
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.999930,+0.010454,-0.005515
which is     R.A.   +0.599 Decl.  -0.316
missing      R.A.   +4.741 Decl.  +2.065 (ibex-sun)
error is     R.A.   +4.142 Decl.  +2.381
for a total  4.777 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 0.998372,0.055468,0.013316 -w ibex-sun -t 2024/03:25:15:55:24
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.998372,+0.055468,+0.013316
which is     R.A.   +3.180 Decl.  +0.763
missing      R.A.   +4.807 Decl.  +2.094 (ibex-sun)
error is     R.A.   +1.627 Decl.  +1.331
for a total  2.101 deg

ibex_rotate -o -u 0.998372,0.055468,0.013316 -w ibex-sun -t 2024/03:25:17:30:30
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.998372,+0.055468,+0.013316
which is     R.A.   +3.180 Decl.  +0.763
missing      R.A.   +4.867 Decl.  +2.121 (ibex-sun)
error is     R.A.   +1.687 Decl.  +1.358
for a total  2.165 deg

ibex_rotate -o -u 0.998372,0.055468,0.013316 -w ibex-sun -t 2024/03:30:02:42:47
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.998372,+0.055468,+0.013316
which is     R.A.   +3.180 Decl.  +0.763
missing      R.A.   +8.790 Decl.  +3.809 (ibex-sun)
error is     R.A.   +5.610 Decl.  +3.046
for a total  6.378 deg

The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0643 apogee:

ibex_rotate -o -u 0.99079,0.127538,0.045485 -w ibex-sun -t 2024/03:30:12:17:33
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.990790,+0.127538,+0.045485
which is     R.A.   +7.335 Decl.  +2.607
missing      R.A.   +9.133 Decl.  +3.936 (ibex-sun)
error is     R.A.   +1.798 Decl.  +1.329
for a total  2.233 deg

ibex_rotate -o -u 0.99079,0.127538,0.045485 -w ibex-sun -t 2024-04-04T03:16:10
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.990790,+0.127538,+0.045485
which is     R.A.   +7.335 Decl.  +2.607
missing      R.A.  +13.426 Decl.  +5.766 (ibex-sun)
error is     R.A.   +6.091 Decl.  +3.159
for a total  6.847 deg

There is no overlap with orbit 0641 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: Thursday, March 7, 2024 at 14:39
To: Carol Weaver <carol.weaver at unh.edu>, Chubin, Eric [US] (SP) <Eric.Chubin 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 #642 ATS Approval (March 21 - 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 #642. Please respond to this thread with comments and approvals. Approvals are required by 16:00,  11 March 2024.

Please note the following:

Battery Balancing

Eclipse Flag True: 2024/03/30 15:00:00

Eclipse Flag False: 2024/03/30 16:30:00

Command Load Constraint Violation Report (CCVR)

IBEX_2024_081_o0642a_v001.ccvr

# Input files:         1

#   IBEX_2024_081_o0642a_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 2024/03/21 20:51:06 UTC

IBX-CLC-016: No command to enable spin pulse protection was found after

             transition to science mode at 2024/03/25 17:00:30 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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