[Isocops] IBEX Orbit# 403 ATS Approval (7 Apr 18 - 16 Apr 18) - v001 approval
Ken Fairchild
fair-play at comcast.net
Fri Mar 30 11:17:45 EDT 2018
All,
I have looked at the orbit 403 ATS,
IBEX_2018_097_o0403a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2018_097_o0403a_v001_.ccvr
are from the removal of the
ACT_SetSpinPulseProtectEnable Enable
commands (2) and for a long contact; the violations are expected.
The PL commands in the v001 ATS match those in the v002 STF,
IBEX_2018_097_o0403a_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_097_o0403a_v001.oef,
and as verified with ibex_orbit.
There are no star tracker outages.
There are no moon in Lo FOV sessions.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file,
IBEX_Orbit403_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 402 left us pointing in safe directions for the orbit 403 arc A ascending and descending sequences:
ibex_rotate -o -u 0.964694,0.245198,0.096141 -w ibex-sun -t 2018/04:08:03:37:57
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.964694,+0.245198,+0.096141
which is R.A. +14.261 Decl. +5.517
missing R.A. +16.608 Decl. +7.039 (ibex-sun)
error is R.A. +2.347 Decl. +1.522
for a total 2.785 deg
ibex_rotate -o -u 0.964694,0.245198,0.096141 -w ibex-sun -t 2018/04:11:15:46:30
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.964694,+0.245198,+0.096141
which is R.A. +14.261 Decl. +5.517
missing R.A. +19.936 Decl. +8.386 (ibex-sun)
error is R.A. +5.675 Decl. +2.869
for a total 6.321 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 0.941803,0.312384,0.12419 -w ibex-sun -t 2018/04:11:17:29:38
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.941803,+0.312384,+0.124190
which is R.A. +18.350 Decl. +7.134
missing R.A. +20.002 Decl. +8.413 (ibex-sun)
error is R.A. +1.652 Decl. +1.279
for a total 2.078 deg
ibex_rotate -o -u 0.941803,0.312384,0.12419 -w ibex-sun -t 2018/04:11:19:04:44
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.941803,+0.312384,+0.124190
which is R.A. +18.350 Decl. +7.134
missing R.A. +20.063 Decl. +8.439 (ibex-sun)
error is R.A. +1.713 Decl. +1.305
for a total 2.141 deg
ibex_rotate -o -u 0.941803,0.312384,0.12419 -w ibex-sun -t 2018/04:16:04:16:04
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.941803,+0.312384,+0.124190
which is R.A. +18.350 Decl. +7.134
missing R.A. +23.985 Decl. +10.019 (ibex-sun)
error is R.A. +5.635 Decl. +2.885
for a total 6.273 deg
The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 404 apogee:
ibex_rotate -o -u 0.912906,0.378101,0.153762 -w ibex-sun -t 2018/04:16:06:50:24
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.912906,+0.378101,+0.153762
which is R.A. +22.498 Decl. +8.845
missing R.A. +24.079 Decl. +10.052 (ibex-sun)
error is R.A. +1.581 Decl. +1.207
for a total 1.971 deg
ibex_rotate -o -u 0.912906,0.378101,0.153762 -w ibex-sun -t 2018-04-21T06:01:24.224Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.912906,+0.378101,+0.153762
which is R.A. +22.498 Decl. +8.845
missing R.A. +28.828 Decl. +11.792 (ibex-sun)
error is R.A. +6.330 Decl. +2.947
for a total 6.889 deg
No Lo O-mode.
There is no overlap with orbit 402 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
> On March 27, 2018 at 2:25 PM "Wesley, Sheral" <Sheral.Wesley at OrbitalATK.com> wrote:
>
>
> Guys,
>
> Here are the planning files and ATS for Orbit# 403.
>
> Please respond to this email thread with comments and approvals
>
> Approvals are required before 29 Mar 18 @0900 UTC
>
>
>
> Note the following:
>
> 1. PERIGEE Battery Balancing
>
> Orbit# 403 PERIGEE Battery Balancing
>
> # 2018-04-16T15:34:57.572Z,Perigee,orbit:403
>
> SetLongEclipseFlag TRUE $TIME=2018/04:16:15:00:00
>
> SetLongEclipseFlag FALSE $TIME=2018/04:16:16:30:00
>
>
>
> 2. Command Load Constraint Violation Report
>
> IBEX_2018_097_o0403a_v001.scr
>
>
>
> ==========================
>
> HARD CONSTRAINT VIOLATIONS
>
> ==========================
>
> NO VIOLATIONS.
>
>
>
> ==========================
>
> SOFT CONSTRAINT VIOLATIONS
>
> ==========================
>
> IBX-CLC-006: Planned transmission at 2018/04/16 21:28:00 UTC - 2018/04/16
>
> 23:02:00 UTC exceeds the maximum contiguous transmission time of
>
> 5400 seconds
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2018/04/08 01:56:07 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2018/04/11 18:34:44 UTC
>
>
>
> ==============
>
> OTHER MESSAGES
>
> ==============
>
> NO MESSAGES.
>
>
>
>
>
> Sheral R. Wesley
>
> Sr Systems Engineer
>
> IBEX , OCO2 Mission OPS
>
> CRS/CYGNUS Mission Planning
>
> Bldg. 2 Room 1337
>
> Office (703) 406-5641
>
> Cell (202) 236-0802
>
> [cid:image001.jpg at 01D04F6C.5A1C97F0]
>
>
>
>
>
> ---------------------------------------------
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> *********************
>
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