[Isocops] IBEX Orbit #638 ATS Approval (Feb 13 - 23, 2024) - v001 approval
Ken Fairchild
kwfairchild at gmail.com
Thu Feb 1 09:00:07 EST 2024
All,
Note: Angle at orbit 639 apogee after perigee sun precession maneuver: 5.114
deg
I have looked at the orbit 638 ATS,
IBEX_2024_044_o0638a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2024_044_o0638a_v001.ccvr
are from the removal of the
ACT_SetSpinPulseProtectEnable Enable
commands (2) and the proximity of two contacts; the violations are expected.
The PL commands in the v001 ATS match those in the v002 STF,
IBEX_2024_044_o0638a_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_044_o0638a_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts about 10 1/2 hours
before 15 Re descending and runs for 1+ 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_Orbit638_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 637 leaves us pointing
in safe directions for the orbit 638 arc A ascending and descending
sequences:
ibex_rotate -o -u 0.820389,-0.520575,-0.236567 -w ibex-sun -t
2024/02:14:00:23:36
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. +326.758 Decl. -13.388 (ibex-sun)
error is R.A. +0.845 Decl. +0.296
for a total 0.873 deg
ibex_rotate -o -u 0.820389,-0.520575,-0.236567 -w ibex-sun -t
2024/02:17:17:45:46
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. +330.490 Decl. -12.039 (ibex-sun)
error is R.A. +2.887 Decl. +1.645
for a total 3.260 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 0.865296,-0.456219,-0.207673 -w ibex-sun -t
2024/02:17:19:28:54
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.865296,-0.456219,-0.207673
which is R.A. +332.200 Decl. -11.986
missing R.A. +330.559 Decl. -12.013 (ibex-sun)
error is R.A. +1.641 Decl. +0.027
for a total 1.605 deg
ibex_rotate -o -u 0.865296,-0.456219,-0.207673 -w ibex-sun -t
2024/02:17:21:04:00
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.865296,-0.456219,-0.207673
which is R.A. +332.200 Decl. -11.986
missing R.A. +330.623 Decl. -11.989 (ibex-sun)
error is R.A. +1.577 Decl. +0.003
for a total 1.543 deg
ibex_rotate -o -u 0.865296,-0.456219,-0.207673 -w ibex-sun -t
2024/02:22:10:28:50
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.865296,-0.456219,-0.207673
which is R.A. +332.200 Decl. -11.986
missing R.A. +334.882 Decl. -10.411 (ibex-sun)
error is R.A. +2.682 Decl. +1.575
for a total 3.066 deg
The sun precession maneuver at perigee leaves us pointing in safe
directions at the time of the maneuver and at orbit 639 apogee:
ibex_rotate -o -r +334.986 -d -10.376 -w ibex-sun -t 2024/02:22:13:11:08
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. +334.986 Decl. -10.376 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +334.986 -d -10.376 -w ibex-sun -t
2024-02-27T12:02:06.441Z
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. +339.805 Decl. -8.491 (ibex-sun)
error is R.A. +4.819 Decl. +1.885
for a total 5.114 deg
Lo Normal mode for the entire orbit.
There is no overlap with orbit 637 commands by manual inspection or by
checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
On Wed, Jan 31, 2024 at 2:53 PM Perry, Timothy E [US] (SP) <
Timothy.Perry at ngc.com> wrote:
>
>
> All,
>
> Attached are the planning files for Orbit #638. Please respond to this
> thread with comments and approvals. Approvals are required by COB 03
> February 2024.
>
>
>
> Please note the following:
>
>
>
> 1. Battery Balancing
>
> Eclipse Flag True: 2024/02/22 18:00:00
>
> Eclipse Flag False: 2024/02/22 19:30:00
>
>
>
> 2. Command Load Constraint Violation Report (CCVR)
>
> IBEX_2024_044_o0638a_v001.ccvr
>
> # Input files: 1
>
> # IBEX_2024_044_o0638a_v001.scr
>
>
>
> ==========================
>
> HARD CONSTRAINT VIOLATIONS
>
> ==========================
>
> NO VIOLATIONS.
>
>
>
> ==========================
>
> SOFT CONSTRAINT VIOLATIONS
>
> ==========================
>
> IBX-CLC-006: Planned transmission at 2024/02/22 20:58:00 UTC - 2024/02/22
>
> 22:02:00 UTC is followed by one or more additional
> transmissions
>
> which, when combined, exceed the maximum transmission time of
> 5400
>
> seconds within a 18000-second window (total planned
> transmission
>
> time this window is 5880.000 seconds)
>
> IBX-CLC-006: Planned transmission at 2024/02/23 02:28:00 UTC - 2024/02/23
>
> 03:32:00 UTC is preceded by one or more additional
> transmissions
>
> which, when combined, exceed the maximum transmission time of
> 5400
>
> seconds within a 18000-second window (total planned
> transmission
>
> time this window is 5880.000 seconds)
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2024/02/13 22:32:00 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2024/02/17 20:34:00 UTC
>
>
>
> ==============
>
> OTHER MESSAGES
>
> ==============
>
> NO MESSAGES.
>
>
>
>
>
> Timothy E.Perry
>
> CRS IBEX OCO-2
>
> Mission Operations
>
> timothy.perry at ngc.com
>
> Office (703) 406-5976
>
> Cell (301) 606-1430
>
>
>
>
>
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