[Isocops] IBEX Orbit #567 ATS Approval (09 - 18 May 2022) - v001 approval
KEN FAIRCHILD
fair-play at comcast.net
Fri Apr 29 01:13:20 EDT 2022
All,
I have looked at the orbit 567 ATS,
IBEX_2022_129_o0567a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2022_129_o0567a_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_2022_129_o0567a_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts ~1 day before 15 Re descending and runs for about 1.5 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_Orbit567_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 566 leaves us pointing in safe directions for the orbit 567 arc A ascending and descending sequences:
ibex_rotate -o -u 0.694466,0.663692,0.277902 -w ibex-sun -t 2022/05:09:15:19:48
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.694466,+0.663692,+0.277902
which is R.A. +43.702 Decl. +16.135
missing R.A. +46.202 Decl. +17.353 (ibex-sun)
error is R.A. +2.500 Decl. +1.218
for a total 2.686 deg
ibex_rotate -o -u 0.694466,0.663692,0.277902 -w ibex-sun -t 2022/05:13:04:19:23
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.694466,+0.663692,+0.277902
which is R.A. +43.702 Decl. +16.135
missing R.A. +49.725 Decl. +18.305 (ibex-sun)
error is R.A. +6.023 Decl. +2.170
for a total 6.148 deg
The inertial 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 -u 0.639493,0.709283,0.296592 -w ibex-sun -t 2022/05:13:06:02:31
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.639493,+0.709283,+0.296592
which is R.A. +47.962 Decl. +17.253
missing R.A. +49.796 Decl. +18.324 (ibex-sun)
error is R.A. +1.834 Decl. +1.071
for a total 2.049 deg
ibex_rotate -o -u 0.639493,0.709283,0.296592 -w ibex-sun -t 2022/05:13:07:37:37
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.639493,+0.709283,+0.296592
which is R.A. +47.962 Decl. +17.253
missing R.A. +49.862 Decl. +18.342 (ibex-sun)
error is R.A. +1.900 Decl. +1.089
for a total 2.112 deg
ibex_rotate -o -u 0.639493,0.709283,0.296592 -w ibex-sun -t 2022/05:17:15:03:08
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.639493,+0.709283,+0.296592
which is R.A. +47.962 Decl. +17.253
missing R.A. +54.105 Decl. +19.367 (ibex-sun)
error is R.A. +6.143 Decl. +2.114
for a total 6.202 deg
The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 568 apogee:
ibex_rotate -o -u 0.579312,0.75141,0.315881 -w ibex-sun -t 2022/05:18:03:26:22
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.579312,+0.751410,+0.315881
which is R.A. +52.369 Decl. +18.414
missing R.A. +54.586 Decl. +19.452 (ibex-sun)
error is R.A. +2.217 Decl. +1.038
for a total 2.339 deg
ibex_rotate -o -u 0.579312,0.75141,0.315881 -w ibex-sun -t 2022-05-22T12:39:47.659Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.579312,+0.751410,+0.315881
which is R.A. +52.369 Decl. +18.414
missing R.A. +59.002 Decl. +20.396 (ibex-sun)
error is R.A. +6.633 Decl. +1.982
for a total 6.562 deg
Lo Normal mode for the entire orbit.
There is no overlap with orbit 566 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
> On 04/25/2022 2:44 PM Perry, Timothy E [US] (SP) <timothy.perry at ngc.com> wrote:
>
>
> All,
> Attached are the planning files for Orbit #567. Please respond to this thread with comments and approvals.
> Approvals are required by 1800, 29 April 2022
>
> Please note the following:
> 1. Battery Balancing this orbit
> Begin 2022/05/17 23:00:00– End 2022/05/18 00:30:00
> 1. Since the inertial maneuver was an hour after perigee, the battery balancing could not be planned for the normal perigee time. I found a quiet period between the first perigee contact and the beginning of the maneuver.
> 2.
> 3. Command Load Constraint Violation Report (CCVR)
> IBEX_2022_129_o0567a_v001.ccvr
> # Input files: 1
> # IBEX_2022_129_o0567a_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 2022/05/09 13:10:21 UTC
> IBX-CLC-016: No command to enable spin pulse protection was found after
> transition to science mode at 2022/05/13 07:07:37 UTC
>
> ==============
> OTHER MESSAGES
> ==============
> NO MESSAGES.
>
>
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