[Isocops] IBEX Orbit #656 ATS Approval (July 25 – August 04, 2024)

Mon Jul 15 19:33:42 EDT 2024

Hi all,
I have looked at the orbit 0656 ATS file, IBEX_2024_207_o0656a_v001.scr and I approve.

The constraint violations in IBEX_2024_207_o0656a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2024_207_o0656a_v001.scr match those in the STF, IBEX_2024_207_o0656a_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_207_o0656a_v001.oef and as verified with ibex_orbit.

There is 1 star tracker outage this orbit. Outage begins at 2024-08-03 22:59:33 and lasts for 3.6 hours.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit656_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 0655 left us pointing in safe directions for the orbit 0656 arc A ascending and descending sequences:

ibex_rotate -o -u -0.506032,0.794893,0.334777 -w ibex-sun -t 2024/07:26:00:59:09
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.506032,+0.794893,+0.334777
which is     R.A. +122.481 Decl. +19.559
missing      R.A. +125.490 Decl. +19.423 (ibex-sun)
error is     R.A.   +3.009 Decl.  +0.136
for a total  2.840 deg

ibex_rotate -o -u -0.506032,0.794893,0.334777 -w ibex-sun -t 2024/07:29:15:14:47
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.506032,+0.794893,+0.334777
which is     R.A. +122.481 Decl. +19.559
missing      R.A. +128.933 Decl. +18.653 (ibex-sun)
error is     R.A.   +6.452 Decl.  +0.906
for a total  6.163 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 -0.569686,0.757869,0.31795 -w ibex-sun -t 2024/07:29:16:57:55
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.569686,+0.757869,+0.317950
which is     R.A. +126.932 Decl. +18.539
missing      R.A. +129.004 Decl. +18.637 (ibex-sun)
error is     R.A.   +2.072 Decl.  +0.098
for a total  1.966 deg

ibex_rotate -o -u -0.569686,0.757869,0.31795 -w ibex-sun -t 2024/07:29:18:33:01
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.569686,+0.757869,+0.317950
which is     R.A. +126.932 Decl. +18.539
missing      R.A. +129.069 Decl. +18.621 (ibex-sun)
error is     R.A.   +2.137 Decl.  +0.082
for a total  2.027 deg

ibex_rotate -o -u -0.569686,0.757869,0.31795 -w ibex-sun -t 2024/08:03:04:51:15
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.569686,+0.757869,+0.317950
which is     R.A. +126.932 Decl. +18.539
missing      R.A. +133.495 Decl. +17.474 (ibex-sun)
error is     R.A.   +6.563 Decl.  +1.065
for a total  6.331 deg

The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0657 apogee:

 ibex_rotate -o -u -0.631176,0.715173,0.30024 -w ibex-sun -t 2024/08:03:07:02:27
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.631176,+0.715173,+0.300240
which is     R.A. +131.430 Decl. +17.472
missing      R.A. +133.585 Decl. +17.446 (ibex-sun)
error is     R.A.   +2.155 Decl.  +0.026
for a total  2.056 deg

ibex_rotate -o -u -0.631176,0.715173,0.30024 -w ibex-sun -t 2024-08-08T04:27:19
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.631176,+0.715173,+0.300240
which is     R.A. +131.430 Decl. +17.472
missing      R.A. +138.152 Decl. +16.154 (ibex-sun)
error is     R.A.   +6.722 Decl.  +1.318
for a total  6.568 deg

There is no overlap with orbit 0655 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, July 11, 2024 at 16:03
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 #656 ATS Approval (July 25 – August 04, 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 #656. Please respond to this thread with comments and approvals. Approvals for the Orbit 656 ATS are required by COB, 15 July 2024.

Please note the following:

Battery Balancing

Eclipse Flag True: 2024/08/03 16:00:00

Eclipse Flag False: 2024/08/03 17:30:00

Command Load Constraint Violation Report (CCVR)

IBEX_2024_207_o0656a_v001.ccvr

# Input files:         1

#   IBEX_2024_207_o0656a_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 2024/07/25 23:33:39 UTC

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

             transition to science mode at 2024/07/29 18:03:01 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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