[Isocops] IBEX Orbit #633 ATS Approval ( Dec 30, 2023 – Jan 08, 2024) - v001 approval
Ken Fairchild
kwfairchild at gmail.com
Tue Dec 19 08:17:26 EST 2023
All,
Note: Angle at descending after apogee sun precession maneuver: 4.046 deg
I have looked at the orbit 633 ATS,
IBEX_2023_363_o0633a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2023_363_o0633a_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_2023_363_o0633a_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_2023_363_o0633a_v001.oef,
and as verified with ibex_orbit.
There are two star tracker outages. The first starts just before apogee
and runs for 2+ hours. The second starts ~1.5 days after apogee and runs
for 1.5 days. 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_Orbit633_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 632 leaves us pointing
in safe directions for the orbit 633 arc A ascending and descending
sequences:
ibex_rotate -o -u 0.148078,-0.903368,-0.402491 -w ibex-sun -t
2023/12:30:03:48:01
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.148078,-0.903368,-0.402491
which is R.A. +279.309 Decl. -23.734
missing R.A. +278.557 Decl. -23.223 (ibex-sun)
error is R.A. +0.752 Decl. +0.511
for a total 0.858 deg
ibex_rotate -o -u 0.148078,-0.903368,-0.402491 -w ibex-sun -t
2024/01:03:04:00:51
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.148078,-0.903368,-0.402491
which is R.A. +279.309 Decl. -23.734
missing R.A. +283.032 Decl. -22.876 (ibex-sun)
error is R.A. +3.723 Decl. +0.858
for a total 3.525 deg
The sun 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 -r +283.114 -d -22.868 -w ibex-sun -t 2024/01:03:05:48:59
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.209056,-0.897373,-0.388609
which is R.A. +283.114 Decl. -22.868
missing R.A. +283.114 Decl. -22.868 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.001 deg
ibex_rotate -o -r +283.114 -d -22.868 -w ibex-sun -t 2024/01:03:07:19:05
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.209056,-0.897373,-0.388609
which is R.A. +283.114 Decl. -22.868
missing R.A. +283.181 Decl. -22.862 (ibex-sun)
error is R.A. +0.067 Decl. +0.006
for a total 0.062 deg
ibex_rotate -o -r +283.114 -d -22.868 -w ibex-sun -t 2024/01:07:07:32:56
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.209056,-0.897373,-0.388609
which is R.A. +283.114 Decl. -22.868
missing R.A. +287.475 Decl. -22.448 (ibex-sun)
error is R.A. +4.361 Decl. +0.420
for a total 4.046 deg
The inertial precession maneuver at perigee leaves us pointing in safe
directions at the time of the maneuver and at orbit 634 apogee:
ibex_rotate -o -u 0.305878,-0.869509,-0.387805 -w ibex-sun -t
2024/01:07:09:55:37
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.305878,-0.869509,-0.387805
which is R.A. +289.381 Decl. -22.818
missing R.A. +287.584 Decl. -22.439 (ibex-sun)
error is R.A. +1.797 Decl. +0.379
for a total 1.701 deg
ibex_rotate -o -u 0.305878,-0.869509,-0.387805 -w ibex-sun -t
2024-01-12T08:15:07.568Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.305878,-0.869509,-0.387805
which is R.A. +289.381 Decl. -22.818
missing R.A. +293.081 Decl. -21.722 (ibex-sun)
error is R.A. +3.700 Decl. +1.096
for a total 3.595 deg
Lo Normal mode for the entire orbit.
There is no overlap with orbit 632 commands by manual inspection or by
checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
On Fri, Dec 15, 2023 at 4:00 PM Perry, Timothy E [US] (SP) <
Timothy.Perry at ngc.com> wrote:
>
>
> All,
>
> Attached are the planning files for Orbit #633. Please respond to this
> thread with comments and approvals. Approvals are required by COB 19 Dec
> 2023
>
>
>
> Please note the following:
>
>
>
> 1. Battery Balancing
>
> Eclipse Flag True: 2024/01/07 17:00:00
>
> Eclipse Flag False: 2024/01/07 18:30:00
>
>
>
> 2. Command Load Constraint Violation Report (CCVR)
>
> IBEX_2023_363_o0633a_v001.ccvr
>
> # Input files: 1
>
> # IBEX_2023_363_o0633a_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 2023/12/30 02:08:52 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2024/01/03 06:49:05 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
>
>
>
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