[Isocops] IBEX Orbit #576 ATS Approval (28 July - 6 Aug 2022) V002
Carol Weaver
Carol.Weaver at unh.edu
Tue Jul 19 07:22:37 EDT 2022
Hi all,
I have looked at the orbit 0576 ATS file, IBEX_2022_209_o0576a_v002.scr and I approve.
The constraint violations in IBEX_2022_209_o0576a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands and transmissions being close together. The violations are acceptable.
The PL commands in IBEX_2022_209_o0576a_v001.scr match those in the STF, IBEX_2022_209_o0576a_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_2022_209_o0576a_v001.oef and as verified with ibex_orbit.
No star tracker outages this orbit.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit576_Contacts_v002.txt for all contacts (4). The timing for one contact was changed in the ATS and the correct timing is in the ATS.
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 0575 left us pointing in safe directions for the orbit 0576 arc A ascending and descending sequences:
ibex_rotate -o -u -0.544948,0.772828,0.325222 -w ibex-sun -t 2022/07:29:03:55:51
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.544948,+0.772828,+0.325222
which is R.A. +125.189 Decl. +18.979
missing R.A. +128.096 Decl. +18.817 (ibex-sun)
error is R.A. +2.907 Decl. +0.162
for a total 2.755 deg
ibex_rotate -o -u -0.544948,0.772828,0.325222 -w ibex-sun -t 2022/08:01:18:08:00
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.544948,+0.772828,+0.325222
which is R.A. +125.189 Decl. +18.979
missing R.A. +131.519 Decl. +17.990 (ibex-sun)
error is R.A. +6.330 Decl. +0.989
for a total 6.084 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 -0.605461,0.734117,0.30739 -w ibex-sun -t 2022/08:01:19:51:08
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.605461,+0.734117,+0.307390
which is R.A. +129.514 Decl. +17.902
missing R.A. +131.590 Decl. +17.973 (ibex-sun)
error is R.A. +2.076 Decl. +0.071
for a total 1.976 deg
ibex_rotate -o -u -0.605461,0.734117,0.30739 -w ibex-sun -t 2022/08:01:21:26:14
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.605461,+0.734117,+0.307390
which is R.A. +129.514 Decl. +17.902
missing R.A. +131.655 Decl. +17.957 (ibex-sun)
error is R.A. +2.141 Decl. +0.055
for a total 2.038 deg
ibex_rotate -o -u -0.605461,0.734117,0.30739 -w ibex-sun -t 2022/08:06:08:08:53
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.605461,+0.734117,+0.307390
which is R.A. +129.514 Decl. +17.902
missing R.A. +136.067 Decl. +16.753 (ibex-sun)
error is R.A. +6.553 Decl. +1.149
for a total 6.359 deg
The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0577 apogee:
ibex_rotate -o -u -0.664328,0.689303,0.289015 -w ibex-sun -t 2022/08:06:11:29:52
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.664328,+0.689303,+0.289015
which is R.A. +133.943 Decl. +16.799
missing R.A. +136.199 Decl. +16.710 (ibex-sun)
error is R.A. +2.256 Decl. +0.089
for a total 2.162 deg
ibex_rotate -o -u -0.664328,0.689303,0.289015 -w ibex-sun -t 2022-08-11T06:30:01
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.664328,+0.689303,+0.289015
which is R.A. +133.943 Decl. +16.799
missing R.A. +140.636 Decl. +15.388 (ibex-sun)
error is R.A. +6.693 Decl. +1.411
for a total 6.583 deg
There is no overlap with orbit 0575 commands.
Command Approval Checklist is attached.
Carol
--
Carol Weaver
University of New Hampshire
503.902.8492
From: NIgel Angold <nangold at princeton.edu>
Date: Monday, 2022-July-18 at 19:58
To: Perry, Timothy E [US] (SP) <Timothy.Perry at ngc.com>
Cc: Carol Weaver <carol.weaver at unh.edu>, Chubin, Eric [US] (SP) <Eric.Chubin at ngc.com>, David Heirtzler <David.Heirtzler at unh.edu>, IBEX FDG Group <ADS-IBEX at l3harris.com>, IBEXOPS <IBEXOPS at gmail.com>, ISOC <isocops at lists.sr.unh.edu>, Ken Fairchild <fair-play at comcast.net>, Ken Fairchild (kwfairchild at gmail.com) <kwfairchild at gmail.com>, Kenneth Fairchild <Ken.Fairchild at unh.edu>, Nigel Angold <angoldconsulting at earthlink.net>, Paul Janzen <Paul.Janzen at mso.umt.edu>, 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: Re: [Isocops] IBEX Orbit #576 ATS Approval (28 July - 6 Aug 2022) V002
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.
I approve IBEX_2022_209_o0576a_v002.scr
Nigel
Perry, Timothy E [US] (SP)<mailto:Timothy.Perry at ngc.com>
July 18, 2022 at 16:03
All,
Attached are 2 updated files for Orbit #576
1. IBEX_2022_209_o0576a_v002.scr - this ATS I made 2 changes
a. APL contact - I changed the first D/L data rate from 40K to 2K
b. Battery Balancing - I changed the Long eclipse times to a 90 minute duration 18:00 - 19:30
2. IBEX_Orbit576_Contacts_v002.txt
a. The APL contact times have been updated to 08/06/22 13:30:00 - 14:30:00
We can uplink the revised ATS on the tomorrow afternoon USHI01 contact @19:30.
IBEX,USHI01,ADD,07/19/22,200,19:30:00,07/19/22,200,20:30:00,LAHO 40K IBEX-2 Orbit# 574 Tracking Contact 13.5re Asc
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