[Isocops] IBEX Orbit #628 ATS Approval (13 Nov - 22 Nov 2023) - v001 approval
Ken Fairchild
kwfairchild at gmail.com
Fri Nov 3 11:59:45 EDT 2023
All,
Note: Angle at descending after apogee sun precession maneuver: 4.020 deg
I have looked at the orbit 628 ATS,
IBEX_2023_317_o0628a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2023_317_o0628a_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_317_o0628a_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_317_o0628a_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts 1+ days after 15 Re
ascending and runs for 4 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_Orbit628_Contacts.txt,
for all contacts (3).
We are not doing battery cell balancing this orbit; we'll do it again in
the next orbit.
The inertial precession maneuver at perigee of orbit 627 leaves us pointing
in safe directions for the orbit 628 arc A ascending and descending
sequences:
ibex_rotate -o -u -0.662293,-0.683815,-0.30621 -w ibex-sun -t
2023/11:14:11:13:55
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.662293,-0.683815,-0.306210
which is R.A. +225.916 Decl. -17.831
missing R.A. +229.092 Decl. -18.161 (ibex-sun)
error is R.A. +3.176 Decl. +0.330
for a total 3.038 deg
ibex_rotate -o -u -0.662293,-0.683815,-0.30621 -w ibex-sun -t
2023/11:18:09:57:10
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.662293,-0.683815,-0.306210
which is R.A. +225.916 Decl. -17.831
missing R.A. +233.120 Decl. -19.107 (ibex-sun)
error is R.A. +7.204 Decl. +1.276
for a total 6.950 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 +233.197 -d -19.124 -w ibex-sun -t 2023/11:18:11:45:18
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.566004,-0.756511,-0.327614
which is R.A. +233.197 Decl. -19.124
missing R.A. +233.197 Decl. -19.124 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.001 deg
ibex_rotate -o -r +233.197 -d -19.124 -w ibex-sun -t 2023/11:18:13:15:24
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.566004,-0.756511,-0.327614
which is R.A. +233.197 Decl. -19.124
missing R.A. +233.260 Decl. -19.138 (ibex-sun)
error is R.A. +0.063 Decl. +0.014
for a total 0.061 deg
ibex_rotate -o -r +233.197 -d -19.124 -w ibex-sun -t 2023/11:22:11:50:00
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.566004,-0.756511,-0.327614
which is R.A. +233.197 Decl. -19.124
missing R.A. +237.353 Decl. -20.033 (ibex-sun)
error is R.A. +4.156 Decl. +0.909
for a total 4.020 deg
The inertial precession maneuver at perigee leaves us pointing in safe
directions at the time of the maneuver and at orbit 629 apogee:
ibex_rotate -o -u -0.535623,-0.771177,-0.34408 -w ibex-sun -t
2023/11:22:14:10:51
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.535624,-0.771178,-0.344081
which is R.A. +235.218 Decl. -20.126
missing R.A. +237.460 Decl. -20.059 (ibex-sun)
error is R.A. +2.242 Decl. +0.067
for a total 2.107 deg
ibex_rotate -o -u -0.535623,-0.771177,-0.34408 -w ibex-sun -t
2023-11-27T14:29:53.333Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.535624,-0.771178,-0.344081
which is R.A. +235.218 Decl. -20.126
missing R.A. +242.800 Decl. -21.066 (ibex-sun)
error is R.A. +7.582 Decl. +0.940
for a total 7.159 deg
Lo Normal mode for the entire orbit.
There is no overlap with orbit 627 commands by manual inspection or by
checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
On Thu, Nov 2, 2023 at 7:36 PM Wesley, Sheral R [US] (SP) <
Sheral.Wesley at ngc.com> wrote:
> All,
>
> Attached are the planning files for Orbit #628. Please respond to this
> thread with comments and approvals. Approvals are required by COB 3 Nov
> 2023
>
>
>
> Please note the following:
>
> Command Load Constraint Violation Report (CCVR)
>
> # Input files: 1
>
> # IBEX_2023_317_o0628a_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 2023/11/14 09:42:42 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2023/11/18 12:45:24 UTC
>
>
>
> ==============
>
> OTHER MESSAGES
>
> ==============
>
> NO MESSAGES.
>
>
>
>
>
>
>
> Best Regards,
>
>
>
> *Sheral* Wesley | Sr Principal Engineer, Satellite Systems
>
> Northrop Grumman Corporation | Space Systems
>
> O: 703-406-5641 | C: 202-236-0802 | sheral.wesley at ngc.com
>
>
>
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