[Isocops] IBEX Orbit #459 ATS Approval ( 30 Aug - 8 Sept 2019 )
Weaver, Carol
Carol.Weaver at unh.edu
Tue Aug 20 16:48:29 EDT 2019
Hi all,
I’ve looked at the orbit 459 ATS (IBEX_2019_242_o0459a_v001.scr) and I approve.
The only constraint violations in IBEX_2019_242_o0459a_v001.ccvr are the removal of the spin pulse protection commands (2); the violations are expected.
The PL commands in the v001 ATS match those in the v002 STF: IBEX_2019_242_o0459a_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_2019_242_o0459a_v001.oef) and as verified with ibex_orbit.
There are no star tracker outages during orbit 459.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file (IBEX_Orbit459_Contacts.txt) for all contacts (3).
We are doing battery cell balancing this orbit and the balancing commands are correct and offset by enough time from other commands.
The inertial precession maneuver at perigee of orbit 458 left us pointing in safe directions for the orbit 459 arc A ascending and descending sequences:
ibex_rotate -o -u -0.898875,0.405555,0.165977 -w ibex-sun -t 2019/08:30:17:48:48
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.898875,+0.405555,+0.165977
which is R.A. +155.716 Decl. +9.554
missing R.A. +158.524 Decl. +8.994 (ibex-sun)
error is R.A. +2.808 Decl. +0.560
for a total 2.827 deg
ibex_rotate -o -u -0.898875,0.405555,0.165977 -w ibex-sun -t 2019/09:03:05:28:32
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.898875,+0.405555,+0.165977
which is R.A. +155.716 Decl. +9.554
missing R.A. +161.615 Decl. +7.784 (ibex-sun)
error is R.A. +5.899 Decl. +1.770
for a total 6.094 deg
The inertial 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 -0.928736,0.344047,0.138136 -w ibex-sun -t 2019/09:03:06:53:15
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.928736,+0.344047,+0.138136
which is R.A. +159.673 Decl. +7.940
missing R.A. +161.669 Decl. +7.764 (ibex-sun)
error is R.A. +1.996 Decl. +0.176
for a total 1.985 deg
ibex_rotate -o -u -0.928736,0.344047,0.138136 -w ibex-sun -t 2019/09:03:08:46:46
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.928736,+0.344047,+0.138136
which is R.A. +159.673 Decl. +7.940
missing R.A. +161.741 Decl. +7.736 (ibex-sun)
error is R.A. +2.068 Decl. +0.204
for a total 2.059 deg
ibex_rotate -o -u -0.928736,0.344047,0.138136 -w ibex-sun -t 2019/09:07:16:25:28
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.928736,+0.344047,+0.138136
which is R.A. +159.673 Decl. +7.940
missing R.A. +165.758 Decl. +6.110 (ibex-sun)
error is R.A. +6.085 Decl. +1.830
for a total 6.310 deg
The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 460 apogee:
ibex_rotate -o -u -0.954056,0.278371,0.110845 -w ibex-sun -t 2019/09:07:18:59:48
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.954056,+0.278371,+0.110845
which is R.A. +163.734 Decl. +6.364
missing R.A. +165.854 Decl. +6.065 (ibex-sun)
error is R.A. +2.120 Decl. +0.299
for a total 2.129 deg
ibex_rotate -o -u -0.954056,0.278371,0.110845 -w ibex-sun -t 2019/09:12:14:01:56
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.954056,+0.278371,+0.110845
which is R.A. +163.734 Decl. +6.364
missing R.A. +170.040 Decl. +4.295 (ibex-sun)
error is R.A. +6.306 Decl. +2.069
for a total 6.610 deg
No Lo O-mode
There is no overlap with orbit 458 commands by manual inspection or by checking http://ibex.unh.edu/cgi-bin/ats.cgi
Command Approval Checklist is attached.
Thanks,
Carol
--
Carol Weaver
University of New Hampshire
503.902.8492
From: "Perry, Timothy" <Timothy.Perry at ngc.com>
Date: Monday, 19August 2019 at 12:10
To: "Weaver, Carol" <Carol.Weaver at unh.edu>, "Chubin, Eric" <Eric.Chubin at ngc.com>, "Joyce, Colin" <Colin.Joyce at unh.edu>, "Heirtzler, David" <David.Heirtzler at unh.edu>, "Dreyer, Sean" <Sean.Dreyer at ngc.com>, IBEX-FDG <ibex.fdg at applieddefense.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>, Nigel Angold <nigel.angold at nasa.gov>, Nigel Angold <angoldconsulting at earthlink.net>, Paul Janzen <paul.janzen at umontana.edu>, "Perry, Timothy" <Timothy.Perry at ngc.com>, "Tyler, Ryan" <Ryan.Tyler at ngc.com>, "Wesley, Sheral" <Sheral.Wesley at ngc.com>
Subject: IBEX Orbit #459 ATS Approval ( 30 Aug - 8 Sept 2019 )
Caution - External Email
________________________________
All,
Attached are the planning files for Orbit #459
Please respond to this thread with comments and approvals.
Approvals are required by 1700 on 20 Aug 2019.
Please note the following:
1. Battery Balancing
# Orbit 459 Battery Balancing
# 2019-09-08T03:23:24.769Z,Perigee,orbit:459
@ECT_SetLongEclipseFlag TRUE $TIME=2019/09:08:03:00:00
@ECT_SetLongEclipseFlag FALSE $TIME=2019/09:08:04:30:00
1. Command Load Constraint Violation Report (CCVR)
# IBEX_2019_242_o0459a_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 2019/08/30 15:47:44 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2019/09/03 08:16:46 UTC
==============
OTHER MESSAGES
==============
NO MESSAGES.
Timothy E.Perry
CRS IBEX OCO-2
Mission Operations
tim.perry at ngc.com
Office (703) 406-5976
Cell (301) 606-1430
[cid:image001.png at 01D55777.180B0DC0]
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*********************
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