[Isocops] IBEX Orbit #590 ATS Approval (05 - 14 Dec 2022)
Ken Fairchild
kwfairchild at gmail.com
Thu Nov 24 14:21:25 EST 2022
All,
Note: Angle at perigee after the apogee sun precession maneuver: 4.132 deg
I have looked at the orbit 590 ATS,
IBEX_2022_338_o0590a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2022_338_o0590a_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_338_o0590a_v001.oef,
and as verified with ibex_orbit.
There are two star tracker outages but they overlap. The outage starts a
few hours before apogee and runs for 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_Orbit590_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 589 leaves us pointing
in safe directions for the orbit 590 arc A ascending and descending
sequences:
ibex_rotate -o -u -0.317035,-0.866481,-0.385616 -w ibex-sun -t
2022/12:05:03:13:59
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.317035,-0.866481,-0.385616
which is R.A. +249.903 Decl. -22.682
missing R.A. +251.212 Decl. -22.334 (ibex-sun)
error is R.A. +1.309 Decl. +0.348
for a total 1.258 deg
ibex_rotate -o -u -0.317035,-0.866481,-0.385616 -w ibex-sun -t
2022/12:09:04:24:47
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.317035,-0.866481,-0.385616
which is R.A. +249.903 Decl. -22.682
missing R.A. +255.617 Decl. -22.764 (ibex-sun)
error is R.A. +5.714 Decl. +0.082
for a total 5.271 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 +255.698 -d -22.770 -w ibex-sun -t 2022/12:09:06:12:55
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.227781,-0.893488,-0.387033
which is R.A. +255.698 Decl. -22.770
missing R.A. +255.698 Decl. -22.770 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +255.698 -d -22.770 -w ibex-sun -t 2022/12:09:07:43:01
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.227781,-0.893488,-0.387033
which is R.A. +255.698 Decl. -22.770
missing R.A. +255.765 Decl. -22.776 (ibex-sun)
error is R.A. +0.067 Decl. +0.006
for a total 0.062 deg
ibex_rotate -o -r +255.698 -d -22.770 -w ibex-sun -t 2022/12:13:08:54:00
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.227781,-0.893488,-0.387033
which is R.A. +255.698 Decl. -22.770
missing R.A. +260.170 Decl. -23.111 (ibex-sun)
error is R.A. +4.472 Decl. +0.341
for a total 4.132 deg
The inertial precession maneuver at perigee leaves us pointing in safe
directions at the time of the maneuver at at orbit 591 apogee:
ibex_rotate -o -u -0.128122,-0.905895,-0.403657 -w ibex-sun -t
2022/12:13:11:35:01
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.128122,-0.905895,-0.403657
which is R.A. +261.950 Decl. -23.807
missing R.A. +260.298 Decl. -23.124 (ibex-sun)
error is R.A. +1.652 Decl. +0.683
for a total 1.662 deg
ibex_rotate -o -u -0.128122,-0.905895,-0.403657 -w ibex-sun -t
2022-12-18T08:04:31.220Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.128122,-0.905895,-0.403657
which is R.A. +261.950 Decl. -23.807
missing R.A. +265.729 Decl. -23.363 (ibex-sun)
error is R.A. +3.779 Decl. +0.444
for a total 3.491 deg
Lo Normal mode for the entire orbit.
There is no overlap with orbit 589 commands by manual inspection or by
checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist attached.
Ken
On Tue, Nov 22, 2022 at 12:58 PM Perry, Timothy E [US] (SP) <
Timothy.Perry at ngc.com> wrote:
> All,
>
> Attached are the planning files for Orbit #590. Please respond to this
> thread with comments and approvals.
>
> Approvals are required by COB, 24 Nov 2022
>
>
>
> Please note the following:
>
> 1. Apogee Sun Maneuver – *2022/12/09 05:57:55*
> 2.
> 3. Battery Balancing this orbit
> 4. Begin 2022/12/13 19:30:00– End 2022/12/13 21:00:00
>
>
> 1. Command Load Constraint Violation Report (CCVR)
>
> IBEX_2022_338_o0590a_v001.ccvr
>
> # Input files: 1
>
> # IBEX_2022_338_o0590a_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 2022/12/05 01:19:29 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2022/12/09 07:13:01 UTC
>
>
>
> ==============
>
> OTHER MESSAGES
>
> ==============
>
> NO MESSAGES.
>
>
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