[Isocops] IBEX Orbit #596 ATS Approval ( 27 Jan - 05 Feb 2023) - v001 approval
Ken Fairchild
kwfairchild at gmail.com
Tue Jan 17 21:49:55 EST 2023
All,
Note: Angle at descending after the apogee sun precession maneuver: 3.968
deg
Angle at orbit 597 apogee after the perigee sun precession
maneuver: 4.950 deg
I have looked at the orbit 596 ATS,
IBEX_2023_027_o0596a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2023_027_o0596a_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_027_o0596a_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts 1+ days before 15 Re
descending and runs for about 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_Orbit596_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 595 leaves us pointing
in safe directions for the orbit 596 arc A ascending and descending
sequences:
ibex_rotate -o -u 0.616646,-0.718234,-0.322315 -w ibex-sun -t
2023/01:27:22:01:40
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.616646,-0.718234,-0.322315
which is R.A. +310.648 Decl. -18.803
missing R.A. +309.799 Decl. -18.442 (ibex-sun)
error is R.A. +0.849 Decl. +0.361
for a total 0.882 deg
ibex_rotate -o -u 0.616646,-0.718234,-0.322315 -w ibex-sun -t
2023/01:31:21:09:54
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.616646,-0.718234,-0.322315
which is R.A. +310.648 Decl. -18.803
missing R.A. +313.958 Decl. -17.315 (ibex-sun)
error is R.A. +3.310 Decl. +1.488
for a total 3.481 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 +314.034 -d -17.293 -w ibex-sun -t 2023/01:31:22:58:02
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.663665,-0.686430,-0.297258
which is R.A. +314.034 Decl. -17.293
missing R.A. +314.034 Decl. -17.293 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +314.034 -d -17.293 -w ibex-sun -t 2023/02:01:00:28:08
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.663665,-0.686430,-0.297258
which is R.A. +314.034 Decl. -17.293
missing R.A. +314.097 Decl. -17.275 (ibex-sun)
error is R.A. +0.063 Decl. +0.018
for a total 0.063 deg
ibex_rotate -o -r +314.034 -d -17.293 -w ibex-sun -t 2023/02:04:23:50:24
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.663665,-0.686430,-0.297258
which is R.A. +314.034 Decl. -17.293
missing R.A. +318.004 Decl. -16.158 (ibex-sun)
error is R.A. +3.970 Decl. +1.135
for a total 3.968 deg
The sun precession maneuver at perigee leaves us pointing in safe
directions at the time of the maneuver and at orbit 597 apogee:
ibex_rotate -o -r +318.126 -d -16.127 -w ibex-sun -t 2023/02:05:02:45:17
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.715313,-0.641228,-0.277767
which is R.A. +318.126 Decl. -16.127
missing R.A. +318.126 Decl. -16.127 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +318.126 -d -16.127 -w ibex-sun -t
2023-02-09T20:51:21.331Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.715313,-0.641228,-0.277767
which is R.A. +318.126 Decl. -16.127
missing R.A. +323.010 Decl. -14.602 (ibex-sun)
error is R.A. +4.884 Decl. +1.525
for a total 4.950 deg
Lo Normal mode for the entire orbit.
There is no overlap with orbit 595 commands by manual inspection or by
checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
On Mon, Jan 16, 2023 at 11:58 AM Perry, Timothy E [US] (SP) <
Timothy.Perry at ngc.com> wrote:
> All,
>
> Attached are the planning files for Orbit #596. Please respond to this
> thread with comments and approvals.
>
> Approvals are required by COB, 17 Jan 2023
>
>
>
> Please note the following:
>
> 1. Apogee Sun Maneuver *2023/01/31 22:43:02*
>
>
>
> 1. Perigee Sun Maneuver *2023/02/05 02:30:17*
>
>
>
> 3. Battery Balancing this orbit
>
> Begin 2023/02/05 10:00:00– End 2023/02/05 11:30:00
>
>
>
> 4. Command Load Constraint Violation Report (CCVR)
>
> IBEX_2023_027_o0596a_v001.ccvr
>
> # Input files: 1
>
> # IBEX_2023_027_o0596a_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 2023/01/27 20:03:55 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2023/01/31 23:58:08 UTC
>
>
>
> ==============
>
> OTHER MESSAGES
>
> ==============
>
> NO MESSAGES.
>
>
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