[Isocops] IBEX Orbit #657 ATS Approval (August 04 - 13, 2024)

Mon Jul 22 17:57:48 EDT 2024

Hi all,
I have looked at the orbit 0657 ATS file, IBEX_2024_216_o0657a_v001.scr and I approve.

The constraint violations in IBEX_2024_216_o0657a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2024_216_o0657a_v001.scr match those in the STF, IBEX_2024_216_o0657a_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_216_o0657a_v001.oef and as verified with ibex_orbit.

There is 1 star tracker outage this orbit. Outage begins at 2024-08-13 00:01:32 and lasts for 2.6 hours.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit657_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 0656 left us pointing in safe directions for the orbit 0657 arc A ascending and descending sequences:

 ibex_rotate -o -u -0.631176,0.715173,0.30024 -w ibex-sun -t 2024/08:04:04:39:29
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. +134.413 Decl. +17.187 (ibex-sun)
error is     R.A.   +2.983 Decl.  +0.285
for a total  2.861 deg

ibex_rotate -o -u -0.631176,0.715173,0.30024 -w ibex-sun -t 2024/08:07:16:54:14
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. +137.690 Decl. +16.286 (ibex-sun)
error is     R.A.   +6.260 Decl.  +1.186
for a total  6.106 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 -0.687203,0.670332,0.280013 -w ibex-sun -t 2024/08:07:18:37:22
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.687203,+0.670332,+0.280013
which is     R.A. +135.712 Decl. +16.261
missing      R.A. +137.758 Decl. +16.267 (ibex-sun)
error is     R.A.   +2.046 Decl.  +0.006
for a total  1.964 deg

ibex_rotate -o -u -0.687203,0.670332,0.280013 -w ibex-sun -t 2024/08:07:20:12:28
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.687203,+0.670332,+0.280013
which is     R.A. +135.712 Decl. +16.261
missing      R.A. +137.822 Decl. +16.249 (ibex-sun)
error is     R.A.   +2.110 Decl.  +0.012
for a total  2.025 deg

ibex_rotate -o -u -0.687203,0.670332,0.280013 -w ibex-sun -t 2024/08:12:04:14:58
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.687203,+0.670332,+0.280013
which is     R.A. +135.712 Decl. +16.261
missing      R.A. +142.053 Decl. +14.943 (ibex-sun)
error is     R.A.   +6.341 Decl.  +1.318
for a total  6.248 deg
The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0658 apogee:

 ibex_rotate -o -u -0.739924,0.620716,0.259274 -w ibex-sun -t 2024/08:12:06:24:27
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.739924,+0.620716,+0.259274
which is     R.A. +140.007 Decl. +15.027
missing      R.A. +142.141 Decl. +14.912 (ibex-sun)
error is     R.A.   +2.134 Decl.  +0.115
for a total  2.065 deg

ibex_rotate -o -u -0.739924,0.620716,0.259274 -w ibex-sun -t 2024-08-17T04:18:12
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.739924,+0.620716,+0.259274
which is     R.A. +140.007 Decl. +15.027
missing      R.A. +146.625 Decl. +13.437 (ibex-sun)
error is     R.A.   +6.618 Decl.  +1.590
for a total  6.609 deg

There is no overlap with orbit 0656 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: Monday, July 22, 2024 at 14:16
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 #657 ATS Approval (August 04 - 13, 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 #657. Please respond to this thread with comments and approvals. Approvals for the Orbit 657 ATS are required by COB, 24 July 2024.

Please note the following:

Battery Balancing

Eclipse Flag True: 2024/08/12 16:00:00

Eclipse Flag False: 2024/08/12 17:30:00

Command Load Constraint Violation Report (CCVR)

IBEX_2024_216_o0657a_v001.ccvr

# Input files:         1

#   IBEX_2024_216_o0657a_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 2024/08/04 03:12:53 UTC

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

             transition to science mode at 2024/08/07 19:42:28 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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