[Isocops] IBEX Orbit #426 ATS Approval ( 3 - 12 Nov )

[Joyce, Colin]

All,


I have looked at the orbit 426 ATS,


IBEX_2018_307_o0426a_v001.scr​,


and I approve.


The only constraint violations in


IBEX_2018_307_o0426a_v001_.ccvr


are from the removal of the


ACT_SetSpinPulseProtectEnable Enable


commands (2); the violations are expected.


The PL commands in the v001 ATS match those in the v002 STF,


IBEX_2018_307_o0426a_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_2018_307_o0426a_v001.oef,


and as verified with ibex_orbit.


There are no star tracker outages.​


The ground station command sequences are correct and the timing and bit rates match those in the contacts file,


IBEX_Orbit426_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 maneuver at perigee of orbit 425 left us pointing in safe directions for the orbit 426 arc A ascending and descending sequences:​


ibex_rotate -o -u -0.785543,-0.564034,-0.254534 -w ibex-sun -t 2018/11:03:22:39:05
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
 points axis  +1.000000,+0.000000,+0.000000
 towards ECI  -0.785543,-0.564034,-0.254534
 which is     R.A. +215.679 Decl. -14.746
 missing      R.A. +218.787 Decl. -15.217 (ibex-sun)
 error is     R.A.   +3.108 Decl.  +0.471
 for a total  3.039 deg



ibex_rotate -o -u -0.785543,-0.564034,-0.254534 -w ibex-sun -t 2018/11:07:09:34:59
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
 points axis  +1.000000,+0.000000,+0.000000
 towards ECI  -0.785543,-0.564034,-0.254534
 which is     R.A. +215.679 Decl. -14.746
 missing      R.A. +222.107 Decl. -16.223 (ibex-sun)
 error is     R.A.   +6.428 Decl.  +1.477
 for a total  6.368 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 -0.73485,-0.618122,-0.279142 -w ibex-sun -t 2018/11:07:11:18:07
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
 points axis  +1.000000,+0.000000,+0.000000
 towards ECI  -0.734850,-0.618122,-0.279142
 which is     R.A. +220.069 Decl. -16.209
 missing      R.A. +222.178 Decl. -16.243 (ibex-sun)
 error is     R.A.   +2.109 Decl.  +0.034
 for a total  2.026 deg


ibex_rotate -o -u -0.73485,-0.618122,-0.279142 -w ibex-sun -t 2018/11:07:12:53:13
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
 points axis  +1.000000,+0.000000,+0.000000
 towards ECI  -0.734850,-0.618122,-0.279142
 which is     R.A. +220.069 Decl. -16.209
 missing      R.A. +222.244 Decl. -16.261 (ibex-sun)
 error is     R.A.   +2.175 Decl.  +0.052
 for a total  2.089 deg



ibex_rotate -o -u -0.73485,-0.618122,-0.279142 -w ibex-sun -t 2018/11:11:18:44:35
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
 points axis  +1.000000,+0.000000,+0.000000
 towards ECI  -0.734850,-0.618122,-0.279142
 which is     R.A. +220.069 Decl. -16.209
 missing      R.A. +226.612 Decl. -17.460 (ibex-sun)
 error is     R.A.   +6.543 Decl.  +1.251
 for a total  6.386 deg



The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 427 apogee:


ibex_rotate -o -u -0.681259,-0.667931,-0.29959 -w ibex-sun -t 2018/11:11:21:08:08
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
 points axis  +1.000000,+0.000000,+0.000000
 towards ECI  -0.681259,-0.667931,-0.299590
 which is     R.A. +224.434 Decl. -17.433
 missing      R.A. +226.719 Decl. -17.492 (ibex-sun)
 error is     R.A.   +2.285 Decl.  +0.059
 for a total  2.181 deg



ibex_rotate -o -u -0.681259,-0.667931,-0.29959 -w ibex-sun -t 2018-11-16T16:36:17
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
 points axis  +1.000000,+0.000000,+0.000000
 towards ECI  -0.681259,-0.667931,-0.299590
 which is     R.A. +224.434 Decl. -17.433
 missing      R.A. +231.545 Decl. -18.759 (ibex-sun)
 error is     R.A.   +7.111 Decl.  +1.326
 for a total  6.888 deg



No Lo O-mode.


There is no overlap with orbit 425 commands by manual inspection or by checking at


http://ibex.unh.edu/cgi-bin/ats.cgi.


Command Approval Checklist is attached.


Colin


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.sr.unh.edu/pipermail/isocops/attachments/20181023/30b53fba/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: IBEX-Command-Approval-Checklist-Rev16e-o0426_CJJ.doc
Type: application/msword
Size: 123904 bytes
Desc: IBEX-Command-Approval-Checklist-Rev16e-o0426_CJJ.doc
URL: <https://lists.sr.unh.edu/pipermail/isocops/attachments/20181023/30b53fba/IBEX-Command-Approval-Checklist-Rev16e-o0426_CJJ-0001.doc>