[Isocops] IBEX Orbit #456 ATS Approval ( 03 - 12 Aug 2019 ) - v001 approval
KEN FAIRCHILD
fair-play at comcast.net
Thu Jul 25 23:37:05 EDT 2019
All,
I have looked at the orbit 456 ATS,
IBEX_2019_215_o0456a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2019_215_o0456a_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_215_o0456a_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_215_o0456a_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts at perigee and runs for about 6 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_Orbit456_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 precession maneuver at perigee of orbit 455 left us pointing in safe directions for the orbit 456 arc A ascending and descending sequences:
ibex_rotate -o -u -0.619179,0.724018,0.304 -w ibex-sun -t 2019/08:03:21:26:07
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. +133.420 Decl. +17.453 (ibex-sun)
error is R.A. +2.883 Decl. +0.245
for a total 2.760 deg
ibex_rotate -o -u -0.619179,0.724018,0.304 -w ibex-sun -t 2019/08:07:09:07:57
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. +136.740 Decl. +16.544 (ibex-sun)
error is R.A. +6.203 Decl. +1.154
for a total 6.039 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 -0.674713,0.68115,0.28425 -w ibex-sun -t 2019/08:07:10:51:05
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.674713,+0.681150,+0.284250
which is R.A. +134.728 Decl. +16.514
missing R.A. +136.809 Decl. +16.525 (ibex-sun)
error is R.A. +2.081 Decl. +0.011
for a total 1.996 deg
ibex_rotate -o -u -0.674713,0.68115,0.28425 -w ibex-sun -t 2019/08:07:12:26:11
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.674713,+0.681150,+0.284250
which is R.A. +134.728 Decl. +16.514
missing R.A. +136.874 Decl. +16.507 (ibex-sun)
error is R.A. +2.146 Decl. +0.007
for a total 2.057 deg
ibex_rotate -o -u -0.674713,0.68115,0.28425 -w ibex-sun -t 2019/08:11:19:53:33
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.674713,+0.681150,+0.284250
which is R.A. +134.728 Decl. +16.514
missing R.A. +141.067 Decl. +15.262 (ibex-sun)
error is R.A. +6.339 Decl. +1.252
for a total 6.223 deg
The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 457 apogee:
ibex_rotate -o -u -0.728296,0.632273,0.264227 -w ibex-sun -t 2019/08:11:22:29:04
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.728296,+0.632273,+0.264227
which is R.A. +139.037 Decl. +15.321
missing R.A. +141.166 Decl. +15.226 (ibex-sun)
error is R.A. +2.129 Decl. +0.095
for a total 2.056 deg
ibex_rotate -o -u -0.728296,0.632273,0.264227 -w ibex-sun -t 2019-08-16T17:48:14.026Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.728296,+0.632273,+0.264227
which is R.A. +139.037 Decl. +15.321
missing R.A. +145.584 Decl. +13.773 (ibex-sun)
error is R.A. +6.547 Decl. +1.548
for a total 6.523 deg
No Lo O-mode.
There is no overlap with orbit 455 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
> On July 22, 2019 at 3:13 PM "Perry, Timothy" <Timothy.Perry at ngc.com> wrote:
>
>
> All,
>
> Attached are the planning files for Orbit #456
>
> Please respond to this thread with comments and approvals.
>
> Approvals are required by 1800 GMT, 24 July 2019.
>
>
> Please note the following:
>
> 1. Orbit 456 Battery Balancing
>
> # 2019-08-12T07:17:11.952Z,Perigee,orbit:456
>
> @ECT_SetLongEclipseFlag TRUE $TIME=2019/08:12:07:00:00
>
> @ECT_SetLongEclipseFlag FALSE $TIME=2019/08:12:08:30:00
>
>
>
> 2. Command Load Constraint Violation Report
>
> # IBEX_2019_215_o0456a_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 2019/08/03 19:34:20 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2019/08/07 11:56:11 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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