[Isocops] IBEX Orbit #449 ATS Approval ( 1 - 10 June 2019) - v001 approval
KEN FAIRCHILD
fair-play at comcast.net
Wed May 22 19:00:58 EDT 2019
All,
I have looked at the orbit 449 ATS,
IBEX_2019_152_o0449a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2019_152_o0449a_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_152_o0449a_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 form the OEF,
IBEX_2019_152_o0449a_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts about 7 hours before perigee and runs for 7+ 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_Orbit449_Contacts.txt,
for all contacts (3).
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 448 left us pointing in safe directions for the orbit 449 arc A ascending and descending sequences:
ibex_rotate -o -u 0.37742,0.853224,0.359948 -w ibex-sun -t 2019/06:01:12:20:32
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.377420,+0.853224,+0.359948
which is R.A. +66.138 Decl. +21.097
missing R.A. +68.840 Decl. +21.990 (ibex-sun)
error is R.A. +2.702 Decl. +0.893
for a total 2.667 deg
ibex_rotate -o -u 0.37742,0.853224,0.359948 -w ibex-sun -t 2019/06:05:04:53:17
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.377420,+0.853224,+0.359948
which is R.A. +66.138 Decl. +21.097
missing R.A. +72.707 Decl. +22.477 (ibex-sun)
error is R.A. +6.569 Decl. +1.380
for a total 6.254 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 0.306051,0.877478,0.369276 -w ibex-sun -t 2019/06:05:06:36:25
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.306051,+0.877478,+0.369276
which is R.A. +70.772 Decl. +21.671
missingR.A. +72.782 Decl. +22.487 (ibex-sun)
error is R.A. +2.010 Decl. +0.816
for a total 2.034 deg
ibex_rotate -o -u 0.306051,0.877478,0.369276 -w ibex-sun -t 2019/06:05:08:11:31
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.306051,+0.877478,+0.369276
which is R.A.+70.772 Decl. +21.671
missing R.A. +72.851 Decl. +22.495 (ibex-sun)
error is R.A. +2.079 Decl. +0.824
for a total 2.096 deg
ibex_rotate -o -u 0.306051,0.877478,0.369276 -w ibex-sun -t 2019/06:09:19:56:10
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.306051,+0.877478,+0.369276
which is R.A. +70.772 Decl. +21.671
missing R.A. +77.450 Decl. +22.957 (ibex-sun)
error is R.A. +6.678 Decl. +1.286
for a total 6.310 deg
The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 450 apogee:
ibex_rotate -o -u 0.230781,0.8963,0.378665 -w ibex-sun -t 2019/06:09:22:39:31
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.230781,+0.896300,+0.378665
which is R.A. +75.561 Decl. +22.251
missingR.A. +77.560 Decl. +22.962 (ibex-sun)
error is R.A. +1.999 Decl. +0.711
for a total 1.977 deg
ibex_rotate -o -u 0.230781,0.8963,0.378665 -w ibex-sun -t 2019-06-14T19:29:17.261Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.230781,+0.896300,+0.378665
which is R.A. +75.561 Decl. +22.251
missing R.A. +82.637 Decl. +23.265 (ibex-sun)
error is R.A. +7.076 Decl. +1.014
for a total 6.603 deg
No Lo O-mode.
There is no overlap with orbit 448 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
> On May 20, 2019 at 11:04 AM "Perry, Timothy" <Timothy.Perry at ngc.com> wrote:
>
>
> All,
>
> Attached are the planning files for Orbit #449
>
> Please respond to this thread with comments and approvals.
>
> Approvals are required by 22 May 2019 @1600z.
>
>
> Please note the following:
>
> 1. No Battery Balancing
>
> 2. Command Load Constraint Violation Report (CCVR)
>
> # Filename: IBEX_2019_152_o0449a_v001.ccvr
>
> # File type: Command Load Constraint Violation Report (CCVR)
>
> # IBEX_2019_152_o0449a_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 2019/06/01 10:17:33 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2019/06/05 07:41:31 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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