[Isocops] IBEX Orbit #634 ATS Approval ( Jan 08 - 17, 2024) Merry Christmas!!! - v001 Approval
Ken Fairchild
kwfairchild at gmail.com
Tue Dec 26 12:08:23 EST 2023
All,
Note: Angle at descending after apogee sun precession maneuver: 4.056 deg
I have looked at the orbit 634 ATS,
IBEX_2024_007_o0634a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2024_007_o0634a_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_2024_007_o0634a_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_2024_007_o0634a_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts 2+ days after apogee
and runs for about 18 hours. 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_Orbit634_Contacts.txt,
for all contacts (3).
We are not doing battery cell balancing; we'll do it again in the next
orbit.
The inertial precession maneuver at perigee of orbit 633 leaves us pointing
in safe directions for the orbit 634 arc A ascending and
descending sequences:
ibex_rotate -o -u 0.305878,-0.869509,-0.387805 -w ibex-sun -t
2024/01:08:06:42:02
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. +288.593 Decl. -22.356 (ibex-sun)
error is R.A. +0.788 Decl. +0.462
for a total 0.862 deg
ibex_rotate -o -u 0.305878,-0.869509,-0.387805 -w ibex-sun -t
2024/01:12:06:42:02
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. +293.012 Decl. -21.733 (ibex-sun)
error is R.A. +3.631 Decl. +1.085
for a total 3.531 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 +293.092 -d -21.720 -w ibex-sun -t 2024/01:12:08:30:10
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.364363,-0.854568,-0.370071
which is R.A. +293.092 Decl. -21.720
missing R.A. +293.092 Decl. -21.720 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +293.092 -d -21.720 -w ibex-sun -t 2024/01:12:10:00:16
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.364363,-0.854568,-0.370071
which is R.A. +293.092 Decl. -21.720
missing R.A. +293.158 Decl. -21.709 (ibex-sun)
error is R.A. +0.066 Decl. +0.011
for a total 0.063 deg
ibex_rotate -o -r +293.092 -d -21.720 -w ibex-sun -t 2024/01:16:10:46:11
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.364363,-0.854568,-0.370071
which is R.A. +293.092 Decl. -21.720
missing R.A. +297.385 Decl. -21.036 (ibex-sun)
error is R.A. +4.293 Decl. +0.684
for a total 4.056 deg
The inertial precession maneuver at perigee leaves us pointing in safe
directions at the time of the maneuver and at orbit 635 apogee:
ibex_rotate -o -u 0.455654,-0.812696,-0.36318 -w ibex-sun -t
2024/01:16:13:17:54
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.455655,-0.812698,-0.363181
which is R.A. +299.278 Decl. -21.296
missing R.A. +297.498 Decl. -21.021 (ibex-sun)
error is R.A. +1.780 Decl. +0.275
for a total 1.682 deg
ibex_rotate -o -u 0.455654,-0.812696,-0.36318 -w ibex-sun -t
2024-01-21T14:02:15.341Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.455655,-0.812698,-0.363181
which is R.A. +299.278 Decl. -21.296
missing R.A. +302.989 Decl. -19.961 (ibex-sun)
error is R.A. +3.711 Decl. +1.335
for a total 3.720 deg
Lo Normal mode for the entire orbit.
There is no overlap with orbit 633 commands by manual inspection or by
checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
On Sun, Dec 24, 2023 at 1:37 PM Perry, Timothy E [US] (SP) <
Timothy.Perry at ngc.com> wrote:
> All,
>
> Attached are the planning files for Orbit #634. Please respond to this
> thread with comments and approvals. Approvals are required by COB 28 Dec
> 2023
>
>
>
> Please note the following:
>
>
>
> 1. No Battery Balancing
>
>
>
> 2. Command Load Constraint Violation Report (CCVR)
>
> IBEX_2024_007_o0634a_v001.ccvr
>
> # Input files: 1
>
> # IBEX_2024_007_o0634a_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 2024/01/08 05:02:30 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2024/01/12 09:30:16 UTC
>
>
>
> ==============
>
> OTHER MESSAGES
>
> ==============
>
> NO MESSAGES.
>
>
>
>
>
> Timothy E.Perry
>
> CRS IBEX OCO-2
>
> Mission Operations
>
> timothy.perry at ngc.com
>
> Office (703) 406-5976
>
> IBEX MOC (703)404-7470
>
> Cell (301) 606-1430
>
>
>
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