[Isocops] IBEX Orbit #454 ATS Approval ( 16 - 25 July 2019 ) - v001 approval
KEN FAIRCHILD
fair-play at comcast.net
Sat Jul 6 17:24:13 EDT 2019
All,
I have looked at the orbit 454 ATS,
IBEX_2019_197_o0454a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2019_197_o0454a_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_197_o0454a_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_197_o0454a_v001.oef,
and as verified with ibex_orbit.
There are two overlapping star tracker outages. The first starts before orbit 453 15 Re descending and the outages end 7- hours after 15 Re ascending. Some despinning may be required due to the second outage.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file,
IBEX_Orbit454_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 sun precession maneuver at perigee of orbit 453 left us pointing in safe directions for the orbit 454 arc A ascending and descending sequences:
ibex_rotate -o -r +114.815 -d +21.497 -w ibex-sun -t 2019/07:16:20:39:50
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.390495,+0.844527,+0.366453
which is R.A. +114.815 Decl. +21.497
missing R.A. +115.607 Decl. +21.327 (ibex-sun)
error is R.A. +0.792 Decl. +0.170
for a total 0.757 deg
ibex_rotate -o -r +114.815 -d +21.497 -w ibex-sun -t 2019/07:20:08:38:04
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.390495,+0.844527,+0.366453
which is R.A. +114.815 Decl. +21.497
missing R.A. +119.122 Decl. +20.738 (ibex-sun)
error is R.A. +4.307 Decl. +0.759
for a total 4.089 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 -0.426215,0.833974,0.350469 -w ibex-sun -t 2019/07:20:10:21:12
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.426215,+0.833974,+0.350469
which is R.A. +117.070 Decl. +20.516
missing R.A. +119.195 Decl. +20.725 (ibex-sun)
error is R.A. +2.125 Decl. +0.209
for a total 2.000 deg
ibex_rotate -o -u -0.426215,0.833974,0.350469 -w ibex-sun -t 2019/07:20:11:56:18
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.426215,+0.833974,+0.350469
which is R.A. +117.070 Decl. +20.516
missing R.A. +119.262 Decl. +20.714 (ibex-sun)
error is R.A. +2.192 Decl. +0.198
for a total 2.062 deg
ibex_rotate -o -u -0.426215,0.833974,0.350469 -w ibex-sun -t 2019/07:24:20:29:21
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.426215,+0.833974,+0.350469
which is R.A. +117.070 Decl. +20.516
missing R.A. +123.666 Decl. +19.862 (ibex-sun)
error is R.A. +6.596 Decl. +0.654
for a total 6.225 deg
The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 455 apogee:
ibex_rotate -o -u -0.493473,0.801565,0.337605 -w ibex-sun -t 2019/07:24:23:02:44
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. +123.767 Decl. +19.836 (ibex-sun)
error is R.A. +2.149 Decl. +0.105
for a total 2.025 deg
ibex_rotate -o -u -0.493473,0.801565,0.337605 -w ibex-sun -t 2019-07-29T20:52:31.050Z
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. +128.528 Decl. +18.738 (ibex-sun)
error is R.A. +6.910 Decl. +0.993
for a total 6.599 deg
No Lo O-mode.
There is no overlap with orbit 453 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
> On July 3, 2019 at 10:42 AM "Perry, Timothy" <Timothy.Perry at ngc.com> wrote:
>
>
> All,
>
> Attached are the planning files for Orbit #454
>
> Please respond to this thread with comments and approvals.
>
> Approvals are required by COB 6 July 2019.
>
>
> Please note the following:
>
> 1. Battery Balancing
>
> # Orbit 454 Battery Balancing
>
> # 2019-07-25T07:43:49.647Z,Perigee,orbit:454
>
> @ECT_SetLongEclipseFlag TRUE $TIME=2019/07:25:07:00:00
>
> @ECT_SetLongEclipseFlag FALSE $TIME=2019/07:25:08:30:00
>
>
>
> 2. Command Load Constraint Violation Report (CCVR)
>
> IBEX_2019_197_o0454a_v001.ccvr
>
> ==========================
>
> 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 2019/07/16 18:53:27 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2019/07/20 11:26:18 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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> Thank you.
> *********************
>
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