[Isocops] IBEX Orbit #455 ATS Approval ( 25 July 03 Aug 2019 ) - v001 approval
KEN FAIRCHILD
fair-play at comcast.net
Sun Jul 14 16:45:15 EDT 2019
All,
I have looked at the orbit 455 ATS,
IBEX_2019_206_o0455a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2019_206_o0455a_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_206_o0455a_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_206_o0455a_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts 1+ hours before perigee and runs for about 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_Orbit455_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 454 left us pointing in safe directions for the orbit 455 arc A ascending and descending sequences:
ibex_rotate -o -u -0.493473,0.801565,0.337605 -w ibex-sun -t 2019/07:25:18:59:27
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.493473,+0.801565,+0.337605
which is R.A. +121.618 Decl. +19.731
missing R.A. +124.527 Decl. +19.630 (ibex-sun)
error is R.A. +2.909 Decl. +0.101
for a total 2.741 deg
ibex_rotate -o -u -0.493473,0.801565,0.337605 -w ibex-sun -t 2019/07:29:09:22:43
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.493473,+0.801565,+0.337605
which is R.A. +121.618 Decl. +19.731
missing R.A. +128.050 Decl. +18.845 (ibex-sun)
error is R.A. +6.432 Decl. +0.886
for a total 6.135 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 -0.556844,0.766065,0.321043 -w ibex-sun -t 2019/07:29:11:05:51
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.556844,+0.766065,+0.321043
which is R.A. +126.013 Decl. +18.726
missing R.A. +128.121 Decl. +18.829 (ibex-sun)
error is R.A. +2.108 Decl. +0.103
for a total 1.999 deg
ibex_rotate -o -u -0.556844,0.766065,0.321043 -w ibex-sun -t 2019/07:29:12:40:57
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.556844,+0.766065,+0.321043
which is R.A. +126.013 Decl. +18.726
missing R.A. +128.187 Decl. +18.815 (ibex-sun)
error is R.A. +2.174 Decl. +0.089
for a total 2.060 deg
ibex_rotate -o -u -0.556844,0.766065,0.321043 -w ibex-sun -t 2019/08:02:22:50:24
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.556844,+0.766065,+0.321043
which is R.A. +126.013 Decl. +18.726
missing R.A. +132.576 Decl. +17.727 (ibex-sun)
error is R.A. +6.563 Decl. +0.999
for a total 6.313 deg
The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 456 apogee:
ibex_rotate -o -u -0.619179,0.724018,0.304 -w ibex-sun -t 2019/08:03:01:29:39
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.619179,+0.724018,+0.304000
which is R.A. +130.537 Decl. +17.698
missing R.A. +132.679 Decl. +17.695 (ibex-sun)
error is R.A. +2.142 Decl. +0.003
for a total 2.041 deg
ibex_rotate -o -u -0.619179,0.724018,0.304 -w ibex-sun -t 2019-08-07T20:41:06.254Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.619179,+0.724018,+0.304000
which is R.A. +130.537 Decl. +17.698
missing R.A. +137.209 Decl. +16.415 (ibex-sun)
error is R.A. +6.672 Decl. +1.283
for a total 6.506 deg
No Lo O-mode.
There is no overlap with orbit 454 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
> On July 11, 2019 at 12:44 PM "Perry, Timothy" <Timothy.Perry at ngc.com> wrote:
>
>
> All,
>
> Attached are the planning files for Orbit #455
>
> Please respond to this thread with comments and approvals.
>
> Approvals are required by COB 15 July 2019.
>
>
> Please note the following:
>
>
>
> 1. No Battery Balancing
>
>
>
> 2. Command Load Constraint Violation Report (CCVR)
>
> IBEX_2019_206_o0455a_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 2019/07/25 17:07:33 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2019/07/29 12:10:57 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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