[Isocops] IBEX Orbit #594 ATS Approval (09 Jan 2023 – 19 Jan 2023)
Ken Fairchild
kwfairchild at gmail.com
Fri Dec 30 09:32:25 EST 2022
All,
Note: Angle at descending after the apogee sun precession maneuver: 3.920
deg
I have looked at the orbit 594 ATS,
IBEX_2023_009_o0594a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2023_009_o0594a_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_2023_009_o0594a_v001.oef,
and as verified with ibex_orbit.
There are two star tracker outages. The first starts 1.5 days after 15 Re
ascending and runs for about 4 hours. The second starts 2 days after
apogee and runs for about 13 hours. Some despinning may be required due to
these outages.
The ground station command sequences are correct and the timing and bit
rates match those in the contacts file,
IBEX_Orbit594_Contacts.txt,
for all contacts (3).
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 593 leaves us pointing
in safe directions for the orbit 594 arc A ascending and descending
sequences:
ibex_rotate -o -u 0.343039,-0.85779,-0.38278 -w ibex-sun -t
2023/01:10:05:19:37
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. +290.985 Decl. -22.056 (ibex-sun)
error is R.A. +0.812 Decl. +0.450
for a total 0.875 deg
ibex_rotate -o -u 0.343039,-0.85779,-0.38278 -w ibex-sun -t
2023/01:14:02:59:44
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. +295.266 Decl. -21.391 (ibex-sun)
error is R.A. +3.469 Decl. +1.115
for a total 3.405 deg
The sun 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 -r +295.345 -d -21.377 -w ibex-sun -t 2023/01:14:04:47:52
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.398618,-0.841571,-0.364503
which is R.A. +295.345 Decl. -21.377
missing R.A. +295.345 Decl. -21.377 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +295.345 -d -21.377 -w ibex-sun -t 2023/01:14:06:17:58
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.398618,-0.841571,-0.364503
which is R.A. +295.345 Decl. -21.377
missing R.A. +295.412 Decl. -21.366 (ibex-sun)
error is R.A. +0.067 Decl. +0.011
for a total 0.063 deg
ibex_rotate -o -r +295.345 -d -21.377 -w ibex-sun -t 2023/01:18:03:41:08
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.398618,-0.841571,-0.364503
which is R.A. +295.345 Decl. -21.377
missing R.A. +299.474 Decl. -20.659 (ibex-sun)
error is R.A. +4.129 Decl. +0.718
for a total 3.920 deg
The inertial precession maneuver at perigee leaves us pointing in safe
directions at the time of the maneuver and at orbit 595 apogee:
ibex_rotate -o -u 0.486197,-0.797708,-0.356754 -w ibex-sun -t
2023/01:18:06:20:20
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.486197,-0.797708,-0.356754
which is R.A. +301.362 Decl. -20.901
missing R.A. +299.593 Decl. -20.641 (ibex-sun)
error is R.A. +1.769 Decl. +0.260
for a total 1.675 deg
ibex_rotate -o -u 0.486197,-0.797708,-0.356754 -w ibex-sun -t
2023-01-23T00:41:50.054Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.486197,-0.797708,-0.356754
which is R.A. +301.362 Decl. -20.901
missing R.A. +304.766 Decl. -19.586 (ibex-sun)
error is R.A. +3.404 Decl. +1.315
for a total 3.453 deg
Lo Normal mode for the entire orbit.
There is no overlap with orbit 593 commands by manual inspection or by
checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
On Thu, Dec 29, 2022 at 1:36 PM Perry, Timothy E [US] (SP) <
Timothy.Perry at ngc.com> wrote:
> All,
>
> Attached are the planning files for Orbit #594. Please respond to this
> thread with comments and approvals. Approvals are required by COB, 30 Dec
> 2022
>
>
>
> Please note the following:
>
> 1. Apogee Sun Maneuver – *2023/01/14 04:32:52*
>
> 2. Battery Balancing this orbit
> Begin 2023/01/18 15:00:00– End 2023/01/18 16:30:00
>
> 3. Command Load Constraint Violation Report (CCVR)
>
> IBEX_2023_009_o0594a_v001.ccvr
>
> # Input files: 1
>
> # IBEX_2023_009_o0594a_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 2023/01/10 03:25:11 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2023/01/14 05:47:58 UTC
>
>
>
> ==============
>
> OTHER MESSAGES
>
> ==============
>
> NO MESSAGES.
>
>
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