[Isocops] IBEX Orbit #655 ATS Approval (July 16 - 25, 2024)

Fri Jul 5 14:17:01 EDT 2024

Hi all,
I have looked at the orbit 0655 ATS file, IBEX_2024_198_o0655a_v001.scr and I approve.

The constraint violations in IBEX_2024_198_o0655a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2024_198_o0655a_v001.scr match those in the STF, IBEX_2024_198_o0655a_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_198_o0655a_v001.oef and as verified with ibex_orbit.

There are 2 star tracker outages this orbit. Outage begins at 2024-07-17 19:39:02 and lasts for 33.5 hours. Outage begins at 2024-07-25 17:45:05 and lasts for 3.4 hours.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit655_Contacts.txt for all contacts (3).

No Battery Balancing this orbit.

The Inertial maneuver at perigee of orbit 0654 left us pointing in safe directions for the orbit 0655 arc A ascending and descending sequences:

 ibex_rotate -o -u -0.372876,0.854863,0.360795 -w ibex-sun -t 2024/07:17:02:48:36
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.372876,+0.854863,+0.360795
which is     R.A. +113.566 Decl. +21.149
missing      R.A. +116.594 Decl. +21.170 (ibex-sun)
error is     R.A.   +3.028 Decl.  +0.021
for a total  2.824 deg

ibex_rotate -o -u -0.372876,0.854863,0.360795 -w ibex-sun -t 2024/07:20:13:57:01
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.372876,+0.854863,+0.360795
which is     R.A. +113.566 Decl. +21.149
missing      R.A. +119.996 Decl. +20.596 (ibex-sun)
error is     R.A.   +6.430 Decl.  +0.553
for a total  6.033 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 -0.439761,0.827836,0.348278 -w ibex-sun -t 2024/07:20:15:40:09
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.439761,+0.827836,+0.348278
which is     R.A. +117.978 Decl. +20.382
missing      R.A. +120.068 Decl. +20.583 (ibex-sun)
error is     R.A.   +2.090 Decl.  +0.201
for a total  1.968 deg

ibex_rotate -o -u -0.439761,0.827836,0.348278 -w ibex-sun -t 2024/07:20:17:15:15
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.439761,+0.827836,+0.348278
which is     R.A. +117.978 Decl. +20.382
missing      R.A. +120.134 Decl. +20.571 (ibex-sun)
error is     R.A.   +2.156 Decl.  +0.189
for a total  2.029 deg

ibex_rotate -o -u -0.439761,0.827836,0.348278 -w ibex-sun -t 2024/07:25:01:10:02
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.439761,+0.827836,+0.348278
which is     R.A. +117.978 Decl. +20.382
missing      R.A. +124.557 Decl. +19.664 (ibex-sun)
error is     R.A.   +6.579 Decl.  +0.718
for a total  6.223 deg

The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0656 apogee:

 ibex_rotate -o -u -0.506032,0.794893,0.334777 -w ibex-sun -t 2024/07:25:03:18:44
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. +124.648 Decl. +19.641 (ibex-sun)
error is     R.A.   +2.167 Decl.  +0.082
for a total  2.043 deg

ibex_rotate -o -u -0.506032,0.794893,0.334777 -w ibex-sun -t 2024-07-30T02:47:47
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. +129.408 Decl. +18.541 (ibex-sun)
error is     R.A.   +6.927 Decl.  +1.018
for a total  6.625 deg

There is no overlap with orbit 0654 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, July 2, 2024 at 23:42
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 #655 ATS Approval (July 16 - 25, 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 #655. Please respond to this thread with comments and approvals. Approvals for the Orbit 655 ATS are required by COB, 06 July 2024.

Please note the following:

NO Battery Balancing

Command Load Constraint Violation Report (CCVR)

IBEX_2024_198_o0655a_v001.ccvr

# Input files:         1

#   IBEX_2024_198_o0655a_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 2024/07/17 01:27:35 UTC

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

             transition to science mode at 2024/07/20 16:45:15 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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