[Isocops] IBEX Orbit #607 ATS Approval (07 - 16 May 2023) - v001 approval

Tue Apr 25 10:28:37 EDT 2023

All,

I have looked at the orbit 607 ATS,

IBEX_2023_127_o0607a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2023_127_o0607a_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_2023_127_o0607a_v001.oef,

and as verified with ibex_orbit.

There is one star tracker outage.  The outage starts about 6.5 hours before
perigee and runs for about 8.5 hours.  No despinning should 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_Orbit607_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 606 leaves us pointing
in safe directions for the orbit 607 arc A ascending and descending
sequences:

ibex_rotate -o -u 0.722412,0.637946,0.266734 -w ibex-sun -t
2023/05:07:13:50:57

Quaternion    +0.000000,+0.000000,+0.000000,+0.000000

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  +0.722412,+0.637946,+0.266734

 which is     R.A.  +41.447 Decl. +15.470

 missing      R.A.  +43.946 Decl. +16.722 (ibex-sun)

 error is     R.A.   +2.499 Decl.  +1.252

 for a total  2.708 deg

ibex_rotate -o -u 0.722412,0.637946,0.266734 -w ibex-sun -t
2023/05:11:05:53:16

Quaternion    +0.000000,+0.000000,+0.000000,+0.000000

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  +0.722412,+0.637946,+0.266734

 which is     R.A.  +41.447 Decl. +15.470

 missing      R.A.  +47.558 Decl. +17.747 (ibex-sun)

 error is     R.A.   +6.111 Decl.  +2.277

 for a total  6.283 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 0.667656,0.686949,0.286943 -w ibex-sun -t
2023/05:11:07:36:24

Quaternion    +0.000000,+0.000000,+0.000000,+0.000000

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  +0.667656,+0.686949,+0.286943

 which is     R.A.  +45.816 Decl. +16.675

 missing      R.A.  +47.630 Decl. +17.767 (ibex-sun)

 error is     R.A.   +1.814 Decl.  +1.092

 for a total  2.048 deg

ibex_rotate -o -u 0.667656,0.686949,0.286943 -w ibex-sun -t
2023/05:11:09:11:30

Quaternion    +0.000000,+0.000000,+0.000000,+0.000000

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  +0.667656,+0.686949,+0.286943

 which is     R.A.  +45.816 Decl. +16.675

 missing      R.A.  +47.695 Decl. +17.785 (ibex-sun)

 error is     R.A.   +1.879 Decl.  +1.110

 for a total  2.110 deg

ibex_rotate -o -u 0.667656,0.686949,0.286943 -w ibex-sun -t
2023/05:15:20:49:48

Quaternion    +0.000000,+0.000000,+0.000000,+0.000000

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  +0.667656,+0.686949,+0.286943

 which is     R.A.  +45.816 Decl. +16.675

 missing      R.A.  +52.108 Decl. +18.902 (ibex-sun)

 error is     R.A.   +6.292 Decl.  +2.227

 for a total  6.391 deg

The inertial precession maneuver at perigee leaves us pointing in safe
directions at the time of the maneuver and at orbit 608 apogee:

ibex_rotate -o -u 0.606895,0.732751,0.307822 -w ibex-sun -t
2023/05:15:23:34:22

Quaternion    +0.000000,+0.000000,+0.000000,+0.000000

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  +0.606895,+0.732751,+0.307822

 which is     R.A.  +50.367 Decl. +17.928

 missing      R.A.  +52.215 Decl. +18.923 (ibex-sun)

 error is     R.A.   +1.848 Decl.  +0.995

 for a total  2.016 deg

ibex_rotate -o -u 0.606895,0.732751,0.307822 -w ibex-sun -t
2023-05-21T00:51:39.504Z

Quaternion    +0.000000,+0.000000,+0.000000,+0.000000

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  +0.606895,+0.732751,+0.307822

 which is     R.A.  +50.367 Decl. +17.928

 missing      R.A.  +57.235 Decl. +20.043 (ibex-sun)

 error is     R.A.   +6.868 Decl.  +2.115

 for a total  6.829 deg

Lo Normal mode for the entire orbit.

There is no overlap with orbit 606 commands by manual inspection or by
checking at

http://ibex.unh.edu/cgi-bin/ats.cgi.

Command Approval Checklist is attached.

Ken

On Mon, Apr 24, 2023 at 11:22 AM Perry, Timothy E [US] (SP) <
Timothy.Perry at ngc.com> wrote:

> All,
>
>    Attached are the planning files for Orbit #607 Please respond to this
> thread with comments and approvals.
>
> Approvals are required by COB, 26 Apr 2023
>
>
>
> Please note the following:
>
>
>
> 1.       No Battery Balancing this orbit
>
>
>
> 2.       Command Load Constraint Violation Report (CCVR)
>
> IBEX_2023_127_o0607a_v001.ccvr
>
> # Input files:         1
>
> #   IBEX_2023_127_o0607a_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 2023/05/07 11:52:02 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
>              transition to science mode at 2023/05/11 08:41:30 UTC
>
>
>
> ==============
>
> OTHER MESSAGES
>
> ==============
>
> NO MESSAGES.
>
>
>
>
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