[Isocops] IBEX Orbit #452 ATS Approval ( 28 June - 7 July 2019 ) - v001 approval
KEN FAIRCHILD
fair-play at comcast.net
Mon Jun 17 16:16:39 EDT 2019
All,
I have looked at the orbit 452 ATS,
IBEX_2019_179_o0452a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2019_179_o0452a_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_2019_179_o0452a_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_179_o0452a_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts 4.5 hours before perigee and runs for 8 hours. No despinning should be required due to this outage.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file,
IBEX_Orbit452_Contacts.txt,
for the first 3 contacts. The APL contact commands will be in a separate ATS.
We are not doing battery cell balancing this orbit; we'll do it again in the next orbit.
The inertial maneuver at perigee of orbit 451 left us pointing in safe directions for the orbit 452 arc A ascending and descending sequences:
ibex_rotate -o -u -0.066571,0.919042,0.388497 -w ibex-sun -t 2019/06:28:17:57:06
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.066571,+0.919042,+0.388497
which is R.A. +94.143 Decl. +22.861
missing R.A. +97.041 Decl. +23.256 (ibex-sun)
error is R.A. +2.898 Decl. +0.395
for a total 2.696 deg
ibex_rotate -o -u -0.066571,0.919042,0.388497 -w ibex-sun -t 2019/07:02:09:14:07
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.066571,+0.919042,+0.388497
which is R.A. +94.143 Decl. +22.861
missing R.A. +100.840 Decl. +23.057 (ibex-sun)
error is R.A. +6.697 Decl. +0.196
for a total 6.169 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 -0.141023,0.912322,0.384424 -w ibex-sun -t 2019/07:02:10:57:15
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.141023,+0.912322,+0.384424
which is R.A. +98.787 Decl. +22.608
missing R.A. +100.916 Decl. +23.053 (ibex-sun)
error is R.A. +2.128 Decl. +0.445
for a total 2.012 deg
ibex_rotate -o -u -0.141023,0.912322,0.384424 -w ibex-sun -t 2019/07:02:12:32:21
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.141023,+0.912322,+0.384424
which is R.A. +98.787 Decl. +22.608
missing R.A. +100.985 Decl. +23.049 (ibex-sun)
error is R.A. +2.198 Decl. +0.441
for a total 2.073 deg
ibex_rotate -o -u -0.141023,0.912322,0.384424 -w ibex-sun -t 2019/07:06:23:14:43
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.141023,+0.912322,+0.384424
which is R.A. +98.787 Decl. +22.608
missing R.A. +105.598 Decl. +22.685 (ibex-sun)
error is R.A. +6.811 Decl. +0.077
for a total 6.286 deg
The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 453 apogee:
ibex_rotate -o -u -0.217197,0.899157,0.379924 -w ibex-sun -t 2019/07:07:01:54:09
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.217197,+0.899157,+0.379924
which is R.A. +103.580 Decl. +22.329
missing R.A. +105.706 Decl. +22.670 (ibex-sun)
error is R.A. +2.126 Decl. +0.341
for a total 1.993 deg
ibex_rotate -o -u -0.217197,0.899157,0.379924 -w ibex-sun -t 2019-07-11T22:04:10.252Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.217197,+0.899157,+0.379924
which is R.A. +103.580 Decl. +22.329
missing R.A. +110.623 Decl. +22.087 (ibex-sun)
error is R.A. +7.043 Decl. +0.242
for a total 6.525 deg
No Lo O-mode.
There is no overlap with orbit 451 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
> On June 14, 2019 at 11:47 AM "Perry, Timothy" <Timothy.Perry at ngc.com> wrote:
>
>
> All,
>
> Attached are the planning files for Orbit #452
>
> Please respond to this thread with comments and approvals.
>
> Approvals are required by COB 18 June 2019.
>
>
> Please note the following:
>
> 1. No battery Balancing
>
> 2. Command Load Constraint Violation Report (CCVR)
>
> # Filename: IBEX_2019_179_o0452a_v001.ccvr
>
> # File type: Command Load Constraint Violation Report (CCVR)
>
> #
>
> # Create time: 2019/165.143551
>
> # Plan period start: 2019/179.160400
>
> # Plan period stop: 2019/188.200000
>
> # Default time format: UTC
>
> #
>
> # Input files: 1
>
> # IBEX_2019_179_o0452a_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 2019/06/28 16:04:48 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2019/07/02 12:02:21 UTC
>
>
>
> ==============
>
> OTHER MESSAGES
>
> ==============
>
> NO MESSAGES.
>
>
>
>
>
> Timothy E.Perry
>
> CRS IBEX OCO-2
>
> Mission Operations
>
> tim.perry at orbitalatk.com
>
> Office (703) 406-5976
>
> Cell (301) 606-1430
>
> [cid:image001.jpg at 01D04F4E.6B1BECE0]
>
>
>
>
>
>
>
> ---------------------------------------------
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> *********************
>
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