[Isocops] IBEX Orbit #636 ATS Approval ( Jan 26 – Feb 4, 2024) - v001 approval
Ken Fairchild
kwfairchild at gmail.com
Mon Jan 15 12:05:59 EST 2024
All,
Note: Angle at descending after apogee sun precession maneuver: 4.023 deg
I have looked at the orbit 636 ATS,
IBEX_2024_026_o0636a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2024_026_o0636a_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_026_o0636a_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_026_o0636a_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts before 15 Re
descending in orbit 635 and ends about 12 hours after apogee. 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_Orbit636_Contacts.txt,
for all contacts (4).
We are doing battery cell balancing and the balancing commands are correct
and offset by enough time from other commands.
The sun precession maneuver at perigee of orbit 635 leaves us pointing in
safe directions for the orbit 636 arc A ascending and descending sequences:
ibex_rotate -o -r +307.404 -d -18.991 -w ibex-sun -t 2024/01:26:17:39:48
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.574369,-0.751134,-0.325420
which is R.A. +307.404 Decl. -18.991
missing R.A. +308.307 Decl. -18.806 (ibex-sun)
error is R.A. +0.903 Decl. +0.185
for a total 0.874 deg
ibex_rotate -o -r +307.404 -d -18.991 -w ibex-sun -t 2024/01:30:18:53:31
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.574369,-0.751134,-0.325420
which is R.A. +307.404 Decl. -18.991
missing R.A. +312.583 Decl. -17.682 (ibex-sun)
error is R.A. +5.179 Decl. +1.309
for a total 5.087 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 +312.659 -d -17.661 -w ibex-sun -t 2024/01:30:20:41:39
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.645696,-0.700739,-0.303385
which is R.A. +312.659 Decl. -17.661
missing R.A. +312.659 Decl. -17.661 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +312.659 -d -17.661 -w ibex-sun -t 2024/01:30:22:11:45
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.645696,-0.700739,-0.303385
which is R.A. +312.659 Decl. -17.661
missing R.A. +312.723 Decl. -17.643 (ibex-sun)
error is R.A. +0.064 Decl. +0.018
for a total 0.063 deg
ibex_rotate -o -r +312.659 -d -17.661 -w ibex-sun -t 2024/02:03:22:52:27
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.645696,-0.700739,-0.303385
which is R.A. +312.659 Decl. -17.661
missing R.A. +316.702 Decl. -16.541 (ibex-sun)
error is R.A. +4.043 Decl. +1.120
for a total 4.023 deg
The inertial precession maneuver at perigee leaves us pointing in safe
directions at the time of the maneuver and at orbit 637 apogee.
ibex_rotate -o -u 0.71808,-0.6345,-0.285956 -w ibex-sun -t
2024/02:04:01:28:41
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.718080,-0.634500,-0.285956
which is R.A. +318.536 Decl. -16.616
missing R.A. +316.810 Decl. -16.514 (ibex-sun)
error is R.A. +1.726 Decl. +0.102
for a total 1.658 deg
ibex_rotate -o -u 0.71808,-0.6345,-0.285956 -w ibex-sun -t
2024-02-08T23:32:32.511Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.718080,-0.634500,-0.285956
which is R.A. +318.536 Decl. -16.616
missing R.A. +321.884 Decl. -14.960 (ibex-sun)
error is R.A. +3.348 Decl. +1.656
for a total 3.622 deg
Lo Normal mode for the entire orbit.
There is no overlap with orbit 635 commands by manual inspection or by
checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
On Sun, Jan 14, 2024 at 12:55 PM Perry, Timothy E [US] (SP) <
Timothy.Perry at ngc.com> wrote:
> All,
>
> Attached are the planning files for Orbit #636. Please respond to this
> thread with comments and approvals. Approvals are required by COB 15 Jan
> 2024. Sorry for the short approval period. I have been out sick for the
> last few days.
>
>
>
> Please note the following:
>
>
>
> 1. Battery Balancing
>
> Eclipse Flag True: 2024/02/04 09:00:00
>
> Eclipse Flag False: 2024/02/04 10:30:00
>
>
>
> 2. Command Load Constraint Violation Report (CCVR)
>
> IBEX_2024_026_o0636a_v001.ccvr
>
> # Input files: 1
>
> # IBEX_2024_026_o0636a_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 2024/01/26 15:49:50 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2024/01/30 21:41:45 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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