[Isocops] IBEX Orbit #672 ATS Approval (December 20 - 29, 2024) - v001 approval
Ken Fairchild
kwfairchild at gmail.com
Mon Dec 9 21:00:24 EST 2024
All,
I have looked at the orbit 672 ATS,
IBEX_2024_354_o0672a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2024_354_o0672a_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_354_o0672a_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_354_o0672a_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts about 1 1/2 days after
apogee and runs for 2- 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_Orbit672_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 671 leaves us pointing
in safe directions for the orbit 672 arc A ascending and descending
sequences:
ibex_rotate -o -u -0.01443,-0.91346,-0.406673 -w ibex-sun -t
2024/12:20:05:57:49
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.014430,-0.913460,-0.406673
which is R.A. +269.095 Decl. -23.996
missing R.A. +268.399 Decl. -23.443 (ibex-sun)
error is R.A. +0.696 Decl. +0.553
for a total 0.844 deg
ibex_rotate -o -u -0.01443,-0.91346,-0.406673 -w ibex-sun -t
2024/12:23:18:37:47
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.014430,-0.913460,-0.406673
which is R.A. +269.095 Decl. -23.996
missing R.A. +272.354 Decl. -23.395 (ibex-sun)
error is R.A. +3.259 Decl. +0.601
for a total 3.044 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 0.065336,-0.911931,-0.40511 -w ibex-sun -t
2024/12:23:20:20:55
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.065336,-0.911931,-0.405110
which is R.A. +274.098 Decl. -23.898
missing R.A. +272.433 Decl. -23.393 (ibex-sun)
error is R.A. +1.665 Decl. +0.505
for a total 1.607 deg
ibex_rotate -o -u 0.065336,-0.911931,-0.40511 -w ibex-sun -t
2024/12:23:21:56:01
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.065336,-0.911931,-0.405110
which is R.A. +274.098 Decl. -23.898
missing R.A. +272.505 Decl. -23.392 (ibex-sun)
error is R.A. +1.593 Decl. +0.506
for a total 1.544 deg
ibex_rotate -o -u 0.065336,-0.911931,-0.40511 -w ibex-sun -t
2024/12:28:05:42:55
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.065336,-0.911931,-0.405110
which is R.A. +274.098 Decl. -23.898
missing R.A. +277.197 Decl. -23.254 (ibex-sun)
error is R.A. +3.099 Decl. +0.644
for a total 2.912 deg
The inertial precession maneuver at perigee leaves us pointing in safe
directions at the time of the maneuver and at orbit 673 apogee:
ibex_rotate -o -u 0.14467,-0.903913,-0.402507 -w ibex-sun -t
2024/12:28:07:37:49
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.144670,-0.903913,-0.402507
which is R.A. +279.093 Decl. -23.735
missing R.A. +277.284 Decl. -23.252 (ibex-sun)
error is R.A. +1.809 Decl. +0.483
for a total 1.728 deg
ibex_rotate -o -u 0.14467,-0.903913,-0.402507 -w ibex-sun -t
2025-01-02T03:26:08.526Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.144670,-0.903913,-0.402507
which is R.A. +279.093 Decl. -23.735
missing R.A. +282.733 Decl. -22.892 (ibex-sun)
error is R.A. +3.640 Decl. +0.843
for a total 3.447 deg
Lo Normal mode for the entire orbit.
There is no overlap with orbit 671 commands by manual inspection or by
checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
On Fri, Dec 6, 2024 at 11:00 AM Perry, Timothy E [US] (SP) <
Timothy.Perry at ngc.com> wrote:
> All,
>
> Attached are the planning files for Orbit #672. Please respond to this
> thread with comments and approvals. Approvals for the Orbit 672 ATS are
> required by COB, 09 December 2024.
>
>
>
>
>
> Please note the following:
>
>
>
> 1. Battery Balancing
>
> Eclipse Flag True: 2024/12:28:17:00:00
>
> Eclipse Flag False: 2024/12:28:18:30:00
>
>
>
> 2. Command Load Constraint Violation Report (CCVR)
>
> IBEX_2024_354_o0672a_v001.ccvr
>
> # Input files: 1
>
> # IBEX_2024_354_o0672a_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 2024/12/20 04:45:01 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2024/12/23 21:26:01 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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