[Isocops] Update IBEX Orbit #631 ATS Approval ( Dec 11 - 20, 2023)

Fri Dec 1 05:13:01 EST 2023

Hi all,

The angle at descending after the apogee sun maneuver is 4.059 deg
I have looked at the orbit 0631 ATS file, IBEX_2023_345_o0631a_v001.scr and I approve.

The constraint violations in IBEX_2023_345_o0631a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2023_345_o0631a_v001.scr match those in the STF, IBEX_2023_345_o0631a_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_2023_345_o0631a_v001.oef and as verified with ibex_orbit.

There is 1 star tracker outage this orbit. Outage begins at 2023-12-14 17:53:53 and lasts for 85.7 hours.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit631_Contacts.txt for all contacts (2).

No Battery Balancing this orbit.

The Inertial maneuver at perigee of orbit 0630 left us pointing in safe directions for the orbit 0631 arc A ascending and descending sequences:

ibex_rotate -o -u -0.17728,-0.898951,-0.400573 -w ibex-sun -t 2023/12:11:18:30:36
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.177280,-0.898951,-0.400573
which is     R.A. +258.844 Decl. -23.614
missing      R.A. +258.198 Decl. -23.013 (ibex-sun)
error is     R.A.   +0.646 Decl.  +0.601
for a total  0.845 deg

ibex_rotate -o -u -0.17728,-0.898951,-0.400573 -w ibex-sun -t 2023/12:15:17:52:09
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.177280,-0.898951,-0.400573
which is     R.A. +258.844 Decl. -23.614
missing      R.A. +262.595 Decl. -23.243 (ibex-sun)
error is     R.A.   +3.751 Decl.  +0.371
for a total  3.461 deg

The Sun 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 -r  +262.676 -d -23.246   -w ibex-sun -t 2023/12:15:19:40:17
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.117131,-0.911322,-0.394680
which is     R.A. +262.676 Decl. -23.246
missing      R.A. +262.676 Decl. -23.246 (ibex-sun)
error is     R.A.   +0.000 Decl.  +0.000
for a total  0.000 deg

ibex_rotate -o -r +262.676 -d -23.246  -w ibex-sun -t 2023/12:15:21:10:23
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.117131,-0.911322,-0.394680
which is     R.A. +262.676 Decl. -23.246
missing      R.A. +262.744 Decl. -23.249 (ibex-sun)
error is     R.A.   +0.068 Decl.  +0.003
for a total  0.063 deg

ibex_rotate -o -r +262.676 -d -23.246  -w ibex-sun -t 2023/12:19:21:07:42
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.117131,-0.911322,-0.394680
which is     R.A. +262.676 Decl. -23.246
missing      R.A. +267.093 Decl. -23.392 (ibex-sun)
error is     R.A.   +4.417 Decl.  +0.146
for a total  4.059 deg

The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0632 apogee:

ibex_rotate -o -u -0.01682,-0.913355,-0.406816 -w ibex-sun -t 2023/12:19:23:27:54
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.016820,-0.913355,-0.406816
which is     R.A. +268.945 Decl. -24.005
missing      R.A. +267.204 Decl. -23.397 (ibex-sun)
error is     R.A.   +1.741 Decl.  +0.608
for a total  1.706 deg

ibex_rotate -o -u -0.01682,-0.913355,-0.406816 -w ibex-sun -t 2023-12-25T00:18:13
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.016820,-0.913355,-0.406816
which is     R.A. +268.945 Decl. -24.005
missing      R.A. +272.887 Decl. -23.390 (ibex-sun)
error is     R.A.   +3.942 Decl.  +0.615
for a total  3.662 deg

There is no overlap with orbit 0630 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, November 29, 2023 at 14:45
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: FW: Update IBEX Orbit #631 ATS Approval ( Dec 11 - 20, 2023)
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,
   There is no battery balancing this orbit. I have updated the email to reflect that.
      Tim

From: Perry, Timothy E [US] (SP) <Timothy.Perry at ngc.com>
Sent: Wednesday, November 29, 2023 2:24 PM
To: carol.weaver at unh.edu; Chubin, Eric [US] (SP) <Eric.Chubin at ngc.com>; David.Heirtzler at unh.edu; ADS-IBEX at l3harris.com; IBEXOPS at gmail.com; isocops at lists.sr.unh.edu; kwfairchild at gmail.com; Ken.Fairchild at unh.edu; angoldconsulting at earthlink.net; 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 #631 ATS Approval ( Dec 11 - 20, 2023)

All,

   Attached are the planning files for Orbit #631. Please respond to this thread with comments and approvals. Approvals are required by COB 01 Dec 2023

Please note the following:

1.        No Battery Balancing

2.        Command Load Constraint Violation Report (CCVR)

IBEX_2023_345_o0631a_v001.ccvr

# Input files:         1

#   IBEX_2023_345_o0631a_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 2023/12/11 16:58:12 UTC

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

             transition to science mode at 2023/12/15 20:40:23 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
Cell (301) 606-1430

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