[Isocops] IBEX Orbit #637 ATS Approval ( Feb 4 - 13, 2024) - v001 approval
Ken Fairchild
kwfairchild at gmail.com
Thu Jan 25 01:11:24 EST 2024
All,
I have looked at the orbit 637 ATS,
IBEX_2024_035_o0637a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2024_035_o0637a_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_035_o0637a_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_035_o0637a_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts about 12 hours before
15 Re descending and runs for 5+ hours. 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_Orbit637_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 636 leaves us pointing
in safe directions for the orbit 637 arc A ascending and descending
sequences:
ibex_rotate -o -u 0.71808,-0.6345,-0.285956 -w ibex-sun -t
2024/02:04:21:30:54
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. +317.692 Decl. -16.287 (ibex-sun)
error is R.A. +0.844 Decl. +0.329
for a total 0.874 deg
ibex_rotate -o -u 0.71808,-0.6345,-0.285956 -w ibex-sun -t
2024/02:08:11:59:27
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. +321.408 Decl. -15.117 (ibex-sun)
error is R.A. +2.872 Decl. +1.499
for a total 3.143 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 0.772407,-0.579055,-0.260926 -w ibex-sun -t
2024/02:08:13:42:35
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.772407,-0.579055,-0.260926
which is R.A. +323.142 Decl. -15.125
missing R.A. +321.479 Decl. -15.094 (ibex-sun)
error is R.A. +1.663 Decl. +0.031
for a total 1.606 deg
ibex_rotate -o -u 0.772407,-0.579055,-0.260926 -w ibex-sun -t
2024/02:08:15:17:41
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.772407,-0.579055,-0.260926
which is R.A. +323.142 Decl. -15.125
missing R.A. +321.544 Decl. -15.072 (ibex-sun)
error is R.A. +1.598 Decl. +0.053
for a total 1.543 deg
ibex_rotate -o -u 0.772407,-0.579055,-0.260926 -w ibex-sun -t
2024/02:13:02:02:51
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.772407,-0.579055,-0.260926
which is R.A. +323.142 Decl. -15.125
missing R.A. +325.819 Decl. -13.672 (ibex-sun)
error is R.A. +2.677 Decl. +1.453
for a total 2.973 deg
The inertial precession maneuver at perigee leaves us pointing in safe
directions at the time of the maneuver and at orbit 638 apogee:
ibex_rotate -o -u 0.820389,-0.520575,-0.236567 -w ibex-sun -t
2024/02:13:04:37:31
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.820389,-0.520575,-0.236567
which is R.A. +327.603 Decl. -13.684
missing R.A. +325.922 Decl. -13.641 (ibex-sun)
error is R.A. +1.681 Decl. +0.043
for a total 1.634 deg
ibex_rotate -o -u 0.820389,-0.520575,-0.236567 -w ibex-sun -t
2024-02-18T05:18:51.727Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.820389,-0.520575,-0.236567
which is R.A. +327.603 Decl. -13.684
missing R.A. +330.953 Decl. -11.865 (ibex-sun)
error is R.A. +3.351 Decl. +1.819
for a total 3.739 deg
Lo Normal mode for the entire orbit.
There is no overlap with orbit 636 commands by manual inspection or by
checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
On Mon, Jan 22, 2024 at 11:45 AM Perry, Timothy E [US] (SP) <
Timothy.Perry at ngc.com> wrote:
> All,
>
> Attached are the planning files for Orbit #637. Please respond to this
> thread with comments and approvals. Approvals are required by COB 25 Jan
> 2024.
>
>
>
> Please note the following:
>
>
>
> 1. No Battery Balancing
>
>
>
> 2. Command Load Constraint Violation Report (CCVR)
>
> IBEX_2024_035_o0637a_v001.ccvr
>
> # Input files: 1
>
> # IBEX_2024_035_o0637a_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 2024/02/04 19:43:10 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2024/02/08 14:47:41 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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