[Isocops] IBEX Orbit #592 ATS Approval (23 Dec 2022 – 01 Jan 2023)
Ken Fairchild
kwfairchild at gmail.com
Tue Dec 13 19:09:46 EST 2022
All,
I have looked at the orbit 592 ATS,
IBEX_2022_356_o0592a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2022_356_o0592a_v001.ccvr
are from the removal of the
ACT_SetSpinPulseProtectEnable Enable
commands (2) and the proximity of contacts; 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_356_o0592a_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts near apogee and runs
for almost 2 1/2 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_Orbit592_Contacts.txt,
for all contacts (5).
We are not doing battery cell balancing this orbit; we'll do it again in
the next orbit.
The inertial precession maneuver at perigee of orbit 591 leaves us pointing
in safe directions for the orbit 592 arc A ascending and descending
sequences:
ibex_rotate -o -u 0.031165,-0.913021,-0.406721 -w ibex-sun -t
2022/12:23:06:57:12
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.031165,-0.913021,-0.406721
which is R.A. +271.955 Decl. -23.999
missing R.A. +271.223 Decl. -23.453 (ibex-sun)
error is R.A. +0.732 Decl. +0.546
for a total 0.865 deg
ibex_rotate -o -u 0.031165,-0.913021,-0.406721 -w ibex-sun -t
2022/12:26:10:50:40
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.031165,-0.913021,-0.406721
which is R.A. +271.955 Decl. -23.999
missing R.A. +274.768 Decl. -23.360 (ibex-sun)
error is R.A. +2.813 Decl. +0.639
for a total 2.654 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 0.10958,-0.90831,-0.403689 -w ibex-sun -t
2022/12:26:12:33:48
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.109580,-0.908310,-0.403689
which is R.A. +276.879 Decl. -23.809
missing R.A. +274.846 Decl. -23.357 (ibex-sun)
error is R.A. +2.033 Decl. +0.452
for a total 1.917 deg
ibex_rotate -o -u 0.10958,-0.90831,-0.403689 -w ibex-sun -t
2022/12:26:14:08:54
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.109580,-0.908310,-0.403689
which is R.A. +276.879 Decl. -23.809
missing R.A. +274.918 Decl. -23.354 (ibex-sun)
error is R.A. +1.961 Decl. +0.455
for a total 1.854 deg
ibex_rotate -o -u 0.10958,-0.90831,-0.403689 -w ibex-sun -t
2022/12:31:05:53:33
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.109580,-0.908310,-0.403689
which is R.A. +276.879 Decl. -23.809
missing R.A. +279.974 Decl. -23.102 (ibex-sun)
error is R.A. +3.095 Decl. +0.707
for a total 2.926 deg
The inertial precession maneuver at perigee leaves us pointing in safe
directions at the time of the maneuver and at orbit 593 apogee:
ibex_rotate -o -u 0.188365,-0.897036,-0.399805 -w ibex-sun -t
2022/12:31:08:27:40
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. +280.095 Decl. -23.098 (ibex-sun)
error is R.A. +1.764 Decl. +0.468
for a total 1.686 deg
ibex_rotate -o -u 0.188365,-0.897036,-0.399805 -w ibex-sun -t
2023-01-05T05:27:09.082Z
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. +285.566 Decl. -22.649 (ibex-sun)
error is R.A. +3.707 Decl. +0.917
for a total 3.530 deg
Lo Normal mode for the entire orbit.
There is no overlap with orbit 591 commands by manual inspection or by
checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist attached.
Ken
On Thu, Dec 8, 2022 at 4:25 PM Perry, Timothy E [US] (SP) <
Timothy.Perry at ngc.com> wrote:
> *Subject:* IBEX Orbit #592 ATS Approval (23 Dec 2022 – 01 Jan 2023)
>
>
>
> All,
>
> Attached are the planning files for Orbit #592. Please respond to this
> thread with comments and approvals. Approvals are required by COB, 12 Dec
> 2022
>
>
>
> Please note the following:
>
> 1. No Battery Balancing this orbit
>
>
>
> 2. Command Load Constraint Violation Report (CCVR)
>
> IBEX_2022_356_o0592a_v001.ccvr
>
> # Input files: 1
>
> # IBEX_2022_356_o0592a_v001.scr
>
>
>
> ==========================
>
> HARD CONSTRAINT VIOLATIONS
>
> ==========================
>
> NO VIOLATIONS.
>
>
>
> ==========================
>
> SOFT CONSTRAINT VIOLATIONS
>
> ==========================
>
> The 2 IBX-CLC-006 soft violations are acceptable. There is a 4.5 hour
> separation between the 2 contacts.
>
>
>
> IBX-CLC-006: Planned transmission at 2022/12/31 03:58:00 UTC - 2022/12/31
>
> 05:02:00 UTC is followed by one or more additional
> transmissions
>
> which, when combined, exceed the maximum transmission time
> of 5400
>
> seconds within a 18000-second window (total planned
> transmission
>
> time this window is 5880.000 seconds)
>
> IBX-CLC-006: Planned transmission at 2022/12/31 09:28:00 UTC - 2022/12/31
>
> 10:32:00 UTC is preceded by one or more additional
> transmissions
>
> which, when combined, exceed the maximum transmission time
> of 5400
>
> seconds within a 18000-second window (total planned
> transmission
>
> time this window is 5880.000 seconds)
>
>
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2022/12/23 05:06:59 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2022/12/26 13:38:54 UTC
>
>
>
> ==============
>
> OTHER MESSAGES
>
> ==============
>
> NO MESSAGES.
>
>
>
>
>
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