Hi all,
I have looked at the orbit 0602 ATS file, IBEX_2023_081_o0602a_v001.scr and I approve.
The constraint violations in IBEX_2023_081_o0602a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.
The PL commands in IBEX_2023_081_o0602a_v001.scr match those in the STF, IBEX_2023_081_o0602a_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_081_o0602a_v001.oef and as verified
with ibex_orbit.
There is 1 star tracker outage this orbit lasting for ~7.5 hours and ending ~1.2 hours before the perigee maneuver.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit602_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 0601 left us pointing in safe directions for the orbit 0602 arc A ascending and descending sequences:
ibex_rotate -o -u 0.999941,0.009023,-0.006126 -w ibex-sun -t 2023/03:22:13:28:02
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.999941,+0.009023,-0.006126
which is R.A. +0.517 Decl. -0.351
missing R.A. +1.213 Decl. +0.505 (ibex-sun)
error is R.A. +0.696 Decl. +0.856
for a total 1.103 deg
ibex_rotate -o -u 0.999941,0.009023,-0.006126 -w ibex-sun -t 2023/03:26:06:46:51
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.999941,+0.009023,-0.006126
which is R.A. +0.517 Decl. -0.351
missing R.A. +4.701 Decl. +2.042 (ibex-sun)
error is R.A. +4.184 Decl. +2.393
for a total 4.819 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 0.998419,0.054719,0.01288 -w ibex-sun -t 2023/03:26:08:29:59
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.998419,+0.054719,+0.012880
which is R.A. +3.137 Decl. +0.738
missing R.A. +4.767 Decl. +2.071 (ibex-sun)
error is R.A. +1.630 Decl. +1.333
for a total 2.105 deg
ibex_rotate -o -u 0.998419,0.054719,0.01288 -w ibex-sun -t 2023/03:26:10:05:05
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.998419,+0.054719,+0.012880
which is R.A. +3.137 Decl. +0.738
missing R.A. +4.827 Decl. +2.098 (ibex-sun)
error is R.A. +1.690 Decl. +1.360
for a total 2.169 deg
ibex_rotate -o -u 0.998419,0.054719,0.01288 -w ibex-sun -t 2023/03:30:22:12:51
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.998419,+0.054719,+0.012880
which is R.A. +3.137 Decl. +0.738
missing R.A. +8.840 Decl. +3.827 (ibex-sun)
error is R.A. +5.703 Decl. +3.089
for a total 6.482 deg
The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0603 apogee:
ibex_rotate -o -u 0.990755,0.12778,0.045572 -w ibex-sun -t 2023/03:31:03:09:26
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.990755,+0.127780,+0.045572
which is R.A. +7.349 Decl. +2.612
missing R.A. +9.019 Decl. +3.894 (ibex-sun)
error is R.A. +1.670 Decl. +1.282
for a total 2.103 deg
ibex_rotate -o -u 0.990755,0.12778,0.045572 -w ibex-sun -t 2023-04-04T21:57:43
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.990755,+0.127780,+0.045572
which is R.A. +7.349 Decl. +2.612
missing R.A. +13.468 Decl. +5.779 (ibex-sun)
error is R.A. +6.119 Decl. +3.167
for a total 6.875 deg
There is no overlap with orbit 0601 commands.
Command Approval Checklist is attached.
Carol
--
Carol Weaver
University of New Hampshire
503-902-8492
From:
NIgel Angold <nangold@princeton.edu>
Date: Sunday, March 12, 2023 at 18:15
To: Perry, Timothy E [US] (SP) <Timothy.Perry@ngc.com>
Cc: Carol Weaver <carol.weaver@unh.edu>, Chubin, Eric [US] (SP) <Eric.Chubin@ngc.com>, David Heirtzler <David.Heirtzler@unh.edu>, IBEX FDG Group <ADS-IBEX@l3harris.com>, IBEXOPS <ibexops@gmail.com>, ISOC <isocops@lists.sr.unh.edu>, Ken Fairchild <fair-play@comcast.net>,
Ken Fairchild (kwfairchild@gmail.com) <kwfairchild@gmail.com>, Kenneth Fairchild <Ken.Fairchild@unh.edu>, angoldconsulting <angoldconsulting@earthlink.net>, Paul Janzen <paul.janzen@mso.umt.edu>, Tyler, Ryan S [US] (SP) <Ryan.Tyler@ngc.com>, Wesley, Sheral
R [US] (SP) <Sheral.Wesley@ngc.com>, Wynn, Reese [US] (SP) <Reese.Wynn@ngc.com>
Subject: Re: [Isocops] IBEX Orbit #602 ATS Approval (22 - 31 Mar 2023)
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I approve IBEX_2023_081_o0602a_v001.scr
Nigel