[Isocops] IBEX Orbit #483 ATS Approval ( 5 - 14 Apr 2020 ) - v001 approval
KEN FAIRCHILD
fair-play at comcast.net
Tue Mar 24 08:27:44 EDT 2020
All,
I have looked at the orbit 483 ATS,
IBEX_2020_096_o0483a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2020_096_o0483a_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_096_o0483a_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_096_o0483a_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts ~6 hours after apogee and runs for 1.5- days. Some despinning may 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_Orbit483_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 482 left us pointing in safe directions for the orbit 483 arc A ascending and descending sequences:
ibex_rotate -o -u 0.972761,0.216101,0.083887 -w ibex-sun -t 2020/04:05:16:41:50
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.972761,+0.216101,+0.083887
which is R.A. +12.525 Decl. +4.812
missing R.A. +14.804 Decl. +6.298 (ibex-sun)
error is R.A. +2.279 Decl. +1.486
for a total 2.712 deg
ibex_rotate -o -u 0.972761,0.216101,0.083887 -w ibex-sun -t 2020/04:09:05:23:23
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.972761,+0.216101,+0.083887
which is R.A. +12.525 Decl. +4.812
missing R.A. +18.141 Decl. +7.688 (ibex-sun)
error is R.A. +5.616 Decl. +2.876
for a total 6.280 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 0.952508,0.283249,0.111798 -w ibex-sun -t 2020/04:09:07:06:31
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.952508,+0.283249,+0.111798
which is R.A. +16.561 Decl. +6.419
missing R.A. +18.207 Decl. +7.716 (ibex-sun)
error is R.A. +1.646 Decl. +1.297
for a total 2.086 deg
ibex_rotate -o -u 0.952508,0.283249,0.111798 -w ibex-sun -t 2020/04:09:08:41:37
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.952508,+0.283249,+0.111798
which is R.A. +16.561 Decl. +6.419
missing R.A. +18.268 Decl. +7.742 (ibex-sun)
error is R.A. +1.707 Decl. +1.323
for a total 2.149 deg
ibex_rotate -o -u 0.952508,0.283249,0.111798 -w ibex-sun -t 2020/04:13:16:04:51
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.952508,+0.283249,+0.111798
which is R.A. +16.561 Decl. +6.419
missing R.A. +22.118 Decl. +9.289 (ibex-sun)
error is R.A. +5.557 Decl. +2.870
for a total 6.207 deg
The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 484 apogee:
ibex_rotate -o -u 0.926693,0.348302,0.14116 -w ibex-sun -t 2020/04:13:19:09:10
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. +8.11
missing R.A. +22.231 Decl. +9.328 (ibex-sun)
error is R.A. +1.632 Decl. +1.213
for a total 2.018 deg
ibex_rotate -o -u 0.926693,0.348302,0.14116 -w ibex-sun -t 2020-04-18T12:25:54.543Z
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. +26.720 Decl. +11.038 (ibex-sun)
error is R.A. +6.121 Decl. +2.923
for a total 6.705 deg
No Lo O-mode.
There is no overlap with orbit 482 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
> On March 22, 2020 at 12:30 PM "Perry, Timothy E [US] (IS)" <Timothy.Perry at ngc.com> wrote:
>
>
> All,
>
> Attached are the planning files for Orbit #483
>
> Please respond to this thread with comments and approvals.
>
> Approvals are required by COB on 26 Mar 2020
>
>
>
> Please note the following:
>
> 1. Battery Balancing
>
> The Battery Balancing was moved forward by 2 hours since the first perigee pass was ending @ 03:00z.
>
> The new time period is still a period of non-operation for the spacecraft.
>
> # Orbit 483 Battery Balancing
>
> # 2020-04-14T02:30:01.720Z,Perigee,orbit:483
>
> @ECT_SetLongEclipseFlag TRUE $TIME=2020/04:14:05:00:00
>
> @ECT_SetLongEclipseFlag FALSE $TIME=2020/04:14:06:30:00
>
>
>
> 2. Command Load Constraint Violation Report (CCVR)
>
> IBEX_2020_096_o0483a_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 2020/04/05 14:08:15 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2020/04/09 08:11:37 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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