[Isocops] IBEX Orbit #484 ATS Approval ( 14 - 23 Apr 2020 ) - v001 approval
KEN FAIRCHILD
fair-play at comcast.net
Fri Apr 3 18:04:21 EDT 2020
All,
I have looked at the orbit 484 ATS,
IBEX_2020_105_o0484a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2020_105_o0484a_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_2020_105_o0484a_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_2020_105_o0484a_v001.oef,
and as verified with ibex_orbit.
There are no star tracker outages.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file,
IBEX_Orbit484_Contacts.txt,
for all contacts (4).
We're not doing battery cell balancing this orbit; we'll do it again in the next orbit.
The inertial maneuver at perigee of orbit 483 left us pointing in safe directions for the orbit 484 arc A ascending and descending sequences:
ibex_rotate -o -u 0.926693,0.348302,0.14116 -w ibex-sun -t 2020/04:14:12:50:59
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.926693,+0.348302,+0.141160
which is R.A. +20.599 Decl. +8.115
missing R.A. +22.920 Decl. +9.560 (ibex-sun)
error is R.A. +2.321 Decl. +1.445
for a total 2.711 deg
ibex_rotate -o -u 0.926693,0.348302,0.14116 -w ibex-sun -t 2020/04:18:00:53:54
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.926693,+0.348302,+0.141160
which is R.A. +20.599 Decl. +8.115
missing R.A. +26.272 Decl. +10.862 (ibex-sun)
error is R.A. +5.673 Decl. +2.747
for a total 6.232 deg
The inertial precession 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 0.896019,0.41129,0.167302 -w ibex-sun -t 2020/04:18:02:37:02
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.896019,+0.411290,+0.167302
which is R.A. +24.656 Decl. +9.631
missing R.A. +26.338 Decl. +10.888 (ibex-sun)
error is R.A. +1.682 Decl. +1.257
for a total 2.079 deg
ibex_rotate -o -u 0.896019,0.41129,0.167302 -w ibex-sun -t 2020/04:18:04:12:08
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.896019,+0.411290,+0.167302
which is R.A. +24.656 Decl. +9.631
missing R.A. +26.400 Decl. +10.912 (ibex-sun)
error is R.A. +1.744 Decl. +1.281
for a total 2.142 deg
ibex_rotate -o -u 0.896019,0.41129,0.167302 -w ibex-sun -t 2020/04:22:12:01:47
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.896019,+0.411290,+0.167302
which is R.A. +24.656 Decl. +9.631
missing R.A. +30.336 Decl. +12.369 (ibex-sun)
error is R.A. +5.680 Decl. +2.738
for a total 6.210 deg
The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 485 apogee:
ibex_rotate -o -u 0.859739,0.472118,0.194816 -w ibex-sun -t 2020/04:22:15:11:08
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.859739,+0.472118,+0.194816
which is R.A. +28.773 Decl. +11.234
missing R.A. +30.453 Decl. +12.405 (ibex-sun)
error is R.A. +1.680 Decl. +1.171
for a total 2.019 deg
ibex_rotate -o -u 0.859739,0.472118,0.194816 -w ibex-sun -t 2020-04-27T10:21:46.221Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.859739,+0.472118,+0.194816
which is R.A. +28.773 Decl. +11.234
missing R.A. +35.085 Decl. +14.000 (ibex-sun)
error is R.A. +6.312 Decl. +2.766
for a total 6.751 deg
No Lo O-mode.
There is no overlap with orbit 483 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
> On April 2, 2020 at 12:01 PM "Perry, Timothy E [US] (IS)" <Timothy.Perry at ngc.com> wrote:
>
>
> All,
>
> Attached are the planning files for Orbit #484
>
> Please respond to this thread with comments and approvals.
>
> Approvals are required by COB on 04 April 2020
>
>
>
> Please note the following:
>
> 1. No Battery Balancing
>
>
>
> 2. Command Load Constraint Violation Report (CCVR)
>
> IBEX_2020_105_o0484a_v001_.ccvr
>
> # Input files: 1
>
> # IBEX_2020_105_o0484a_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 2020/04/14 10:30:49 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2020/04/18 03:42:08 UTC
>
>
>
> ==============
>
> OTHER MESSAGES
>
> ==============
>
> NO MESSAGES.
>
>
>
> Timothy E.Perry
>
> CRS IBEX OCO-2
>
> Mission Operations
>
> timothy.perry at ngc.com
>
> Office (703) 406-5976
>
> Cell (301) 606-1430
>
>
>
> [cid:image001.png at 01D542D6.6047A400]
>
>
>
>
>
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