[Isocops] IBEX Orbit #593 ATS Approval (01 Jan 2023 – 09 Jan 2023) - v001 approval
Ken Fairchild
kwfairchild at gmail.com
Tue Dec 20 21:41:16 EST 2022
All,
I have looked at the orbit 593 ATS,
IBEX_2022_365_o0593a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2022_365_o0593a_v001.ccvr
are from the removal of the
ACT_SetSpinPulseProtectEnable Enable
commands (2); the violations are expected.
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_2022_365_o0593a_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts about 12 hours after
apogee and runs for 2.5+ days. Some despinning may be required due to this
outage.
The ground station command sequences are correct and the timing and the bit
rates match those in the contacts file,
IBEX_Orbit593_Contacts.txt,
for all contacts (2).
We are doing battery cell balancing and the balancing commands are correct
and offset by enough time from other commands.
The inertial precession maneuver at perigee of orbit 592 leaves us pointing
in safe directions for the orbit 593 arc A ascending and descending
sequences:
ibex_rotate -o -u 0.188365,-0.897036,-0.399805 -w ibex-sun -t
2023/01:01:04:38:04
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.188365,-0.897036,-0.399805
which is R.A. +281.859 Decl. -23.566
missing R.A. +281.088 Decl. -23.066 (ibex-sun)
error is R.A. +0.771 Decl. +0.500
for a total 0.867 deg
ibex_rotate -o -u 0.188365,-0.897036,-0.399805 -w ibex-sun -t
2023/01:04:17:54:50
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.188365,-0.897036,-0.399805
which is R.A. +281.859 Decl. -23.566
missing R.A. +285.047 Decl. -22.706 (ibex-sun)
error is R.A. +3.188 Decl. +0.860
for a total 3.055 deg
The inertial precession maneuver at apogee leaves us pointing in safe
directions at the time of the maneuver and for the arc B ascending and
descending sequences:
ibex_rotate -o -u 0.266163,-0.880742,-0.391727 -w ibex-sun -t
2023/01:04:19:37:58
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.266163,-0.880742,-0.391727
which is R.A. +286.815 Decl. -23.062
missing R.A. +285.124 Decl. -22.698 (ibex-sun)
error is R.A. +1.691 Decl. +0.364
for a total 1.600 deg
ibex_rotate -o -u 0.266163,-0.880742,-0.391727 -w ibex-sun -t
2023/01:04:21:13:04
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.266163,-0.880742,-0.391727
which is R.A. +286.815 Decl. -23.062
missing R.A. +285.196 Decl. -22.690 (ibex-sun)
error is R.A. +1.619 Decl. +0.372
for a total 1.538 deg
ibex_rotate -o -u 0.266163,-0.880742,-0.391727 -w ibex-sun -t
2023/01:09:06:55:00
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.266163,-0.880742,-0.391727
which is R.A. +286.815 Decl. -23.062
missing R.A. +289.905 Decl. -22.159 (ibex-sun)
error is R.A. +3.090 Decl. +0.903
for a total 2.992 deg
The inertial precession maneuver at perigee leaves us pointing in safe
directions at the time of the maneuver and at orbit 594 apogee:
ibex_rotate -o -u 0.343039,-0.85779,-0.38278 -w ibex-sun -t
2023/01:09:09:33:04
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.343039,-0.857790,-0.382780
which is R.A. +291.797 Decl. -22.506
missing R.A. +290.027 Decl. -22.147 (ibex-sun)
error is R.A. +1.770 Decl. +0.359
for a total 1.676 deg
ibex_rotate -o -u 0.343039,-0.85779,-0.38278 -w ibex-sun -t
2023-01-14T04:32:50.325Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.343039,-0.857790,-0.382780
which is R.A. +291.797 Decl. -22.506
missing R.A. +295.334 Decl. -21.379 (ibex-sun)
error is R.A. +3.537 Decl. +1.127
for a total 3.469 deg
Lo Normal mode for the entire orbit.
There is no overlap with orbit 592 commands by manual inspection or by
checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist attached.
Ken
On Mon, Dec 19, 2022 at 11:20 AM Perry, Timothy E [US] (SP) <
Timothy.Perry at ngc.com> wrote:
> All,
>
> Attached are the planning files for Orbit #593. Please respond to this
> thread with comments and approvals. Approvals are required by COB, 21 Dec
> 2022
>
>
>
> Please note the following:
>
>
>
> 1. Battery Balancing this orbit
>
> Begin 2023/01/09 18:00:00– End 2023/01/09 19:30:00
>
>
>
> 2. Command Load Constraint Violation Report (CCVR)
>
> IBEX_2022_365_o0593a_v001.ccvr
>
> # Input files: 1
>
> # IBEX_2022_365_o0593a_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 2023/01/01 02:47:43 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2023/01/04 20:43:04 UTC
>
>
>
> ==============
>
> OTHER MESSAGES
>
> ==============
>
> NO MESSAGES.
>
>
>
>
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