[Isocops] IBEX Orbit #639 ATS Approval (Feb 23 - March 03, 2024) - v001 approval
Ken Fairchild
kwfairchild at gmail.com
Sat Feb 10 23:39:39 EST 2024
All,
Note: Angle at descending after apogee sun precession maneuver: 3.970 deg
I have looked at the orbit 639 ATS,
IBEX_2024_053_o0639a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2024_053_o0639a_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_053_o0639a_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_053_o0639a_v001.oef,
and as verified with ibex_orbit.
There are three star tracker outages. The first starts before we descend
in orbit 638 arc B and runs for 2+ days. The second starts 1+ days before
apogee and runs for 3 days. The third starts 6 hours before 15 Re
descending and runs for 7.5 hours. Some despinning may be required due to
these outages.
The ground station command sequences are correct and the timing and bit
rates match those in the contacts file,
IBEX_Orbit639_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 sun precession maneuver at perigee of orbit 638 leaves us pointing in
safe directions for the orbit 639 arc A ascending and descending sequences:
ibex_rotate -o -r +334.986 -d -10.376 -w ibex-sun -t 2024/02:23:08:33:09
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.891385,-0.415925,-0.180107
which is R.A. +334.986 Decl. -10.376
missing R.A. +335.774 Decl. -10.107 (ibex-sun)
error is R.A. +0.788 Decl. +0.269
for a total 0.821 deg
ibex_rotate -o -r +334.986 -d -10.376 -w ibex-sun -t 2024/02:27:10:29:00
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.891385,-0.415925,-0.180107
which is R.A. +334.986 Decl. -10.376
missing R.A. +339.744 Decl. -8.516 (ibex-sun)
error is R.A. +4.758 Decl. +1.860
for a total 5.048 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 +339.815 -d -8.487 -w ibex-sun -t 2024/02:27:12:17:08
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.928305,-0.341274,-0.147585
which is R.A. +339.815 Decl. -8.487
missing R.A. +339.815 Decl. -8.487 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +339.815 -d -8.487 -w ibex-sun -t 2024/02:27:13:47:14
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.928305,-0.341274,-0.147585
which is R.A. +339.815 Decl. -8.487
missing R.A. +339.873 Decl. -8.463 (ibex-sun)
error is R.A. +0.058 Decl. +0.024
for a total 0.063 deg
ibex_rotate -o -r +339.815 -d -8.487 -w ibex-sun -t 2024/03:02:14:02:26
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.928305,-0.341274,-0.147585
which is R.A. +339.815 Decl. -8.487
missing R.A. +343.527 Decl. -6.991 (ibex-sun)
error is R.A. +3.712 Decl. +1.496
for a total 3.970 deg
The inertial precession maneuver at perigee leaves us pointing in safe
directions at the time of the maneuver and at orbit 640 apogee:
ibex_rotate -o -u 0.959973,-0.252847,-0.120501 -w ibex-sun -t
2024/03:02:17:42:25
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.959973,-0.252847,-0.120501
which is R.A. +345.244 Decl. -6.921
missing R.A. +343.663 Decl. -6.942 (ibex-sun)
error is R.A. +1.581 Decl. +0.021
for a total 1.569 deg
ibex_rotate -o -u 0.959973,-0.252847,-0.120501 -w ibex-sun -t
2024-03-07T14:50:10.088Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.959973,-0.252847,-0.120501
which is R.A. +345.244 Decl. -6.921
missing R.A. +348.309 Decl. -5.001 (ibex-sun)
error is R.A. +3.065 Decl. +1.920
for a total 3.603 deg
Lo Normal mode for the entire orbit.
There is no overlap with orbit 638 commands by manual inspection or by
checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
On Thu, Feb 8, 2024 at 1:25 PM Perry, Timothy E [US] (SP) <
Timothy.Perry at ngc.com> wrote:
> All,
>
> Attached are the planning files for Orbit #639. Please respond to this
> thread with comments and approvals. Approvals are required by COB 12
> February 2024.
>
>
>
> Please note the following:
>
>
>
> 1. No Battery Balancing
>
> Eclipse Flag True: 2024/03/03 01:00:00
>
> Eclipse Flag False: 2024/03/03 02:30:00
>
>
>
> 2. Command Load Constraint Violation Report (CCVR)
>
> IBEX_2024_053_o0639a_v001.ccvr
>
> # Input files: 1
>
> # IBEX_2024_053_o0639a_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 2024/02/23 06:39:01 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2024/02/27 13:17:14 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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