[Isocops] IBEX Orbit #603 ATS Approval (31 Mar - 09 Apr 2023)
Ken Fairchild
kwfairchild at gmail.com
Tue Apr 4 20:50:06 EDT 2023
All,
Note: Angle at descending after apogee sun precession maneuver: 3.921 deg
Angle at orbit 604 apogee after perigee sun precession
maneuver: 4.873
deg
I have looked at the orbit 603 ATS,
IBEX_2023_090_o0603a_v002.scr,
and I approve.
The only constraint violations in
IBEX_2023_090_o0603a_v002.ccvr
are from the removal of the
ACT_SetSpinPulseProtectEnable Enable
commands (2) and the proximity of contacts; 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_090_o0603a_v002.oef,
and as verified with ibex_orbit.
There are two star tracker outages. The first starts 1.5+ days before 15
Re descending and runs for 1.5- days. The second starts about 1 hour
before 15 Re descending and runs for 9 hours. Some despinning may be
required due to the first outage.
The ground station command sequences are correct and the timing and bit
rates match those in the contacts file,
IBEX_Orbit603_Contacts_v2.txt,
for all contacts (2).
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 602 leaves us pointing
in safe directions for the orbit 603 arc A ascending and descending
sequences:
ibex_rotate -o -u 0.990755,0.12778,0.045572 -w ibex-sun -t
2023/04:01:17:23:58
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.990755,+0.127780,+0.045572
which is R.A. +7.349 Decl. +2.612
missing R.A. +10.496 Decl. +4.487 (ibex-sun)
error is R.A. +3.147 Decl. +1.875
for a total 3.658 deg
ibex_rotate -o -u 0.990755,0.12778,0.045572 -w ibex-sun -t
2023/04:04:20:22:30
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.990755,+0.127780,+0.045572
which is R.A. +7.349 Decl. +2.612
missing R.A. +13.407 Decl. +5.753 (ibex-sun)
error is R.A. +6.058 Decl. +3.141
for a total 6.809 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 +13.476 -d +5.783 -w ibex-sun -t 2023/04:04:22:10:38
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.967518,+0.231852,+0.100761
which is R.A. +13.476 Decl. +5.783
missing R.A. +13.476 Decl. +5.783 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +13.476 -d +5.783 -w ibex-sun -t 2023/04:04:23:40:44
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.967518,+0.231852,+0.100761
which is R.A. +13.476 Decl. +5.783
missing R.A. +13.534 Decl. +5.808 (ibex-sun)
error is R.A. +0.058 Decl. +0.025
for a total 0.063 deg
ibex_rotate -o -r +13.476 -d +5.783 -w ibex-sun -t 2023/04:08:23:44:33
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.967518,+0.231852,+0.100761
which is R.A. +13.476 Decl. +5.783
missing R.A. +17.120 Decl. +7.289 (ibex-sun)
error is R.A. +3.644 Decl. +1.506
for a total 3.921 deg
The sun precession maneuver at perigee leaves us pointing in safe
directions at the time of the maneuver at at orbit 604 apogee:
ibex_rotate -o -r +17.225 -d +7.327 -w ibex-sun -t 2023/04:09:02:38:57
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.947350,+0.293707,+0.127532
which is R.A. +17.225 Decl. +7.327
missing R.A. +17.225 Decl. +7.327 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +17.225 -d +7.327 -w ibex-sun -t 2023-04-13T23:59:46.682Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.947350,+0.293707,+0.127532
which is R.A. +17.225 Decl. +7.327
missing R.A. +21.790 Decl. +9.155 (ibex-sun)
error is R.A. +4.565 Decl. +1.828
for a total 4.873 deg
Lo Normal mode for the entire orbit.
There is no overlap with orbit 602 commands by manual inspection or by
checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
On Sun, Apr 2, 2023 at 12:30 PM Perry, Timothy E [US] (SP) <
Timothy.Perry at ngc.com> wrote:
> All,
>
> Attached are the planning files for Orbit #603. Please respond to
> this thread with comments and approvals.
>
> Approvals are required by 0200, 03 April 2023.
>
>
>
> All,
>
> We will be deleting the timed commands for orbit 603 & 604 tonight
> and up-linking a version 2 Orbit 603 ATS with apogee and perigee sun
> maneuvers. We are experiencing a star tracker issue that prohibits us from
> safely performing an inertial maneuver. Here are the changes to note for
> the new version 2 ATS for orbit 603.
>
>
>
> Tonight’s contact:
>
> IBEX,USHI02,ADD,04/03/23,093,08:00:00,04/03/23,093,09:00:00,,LAHO 2K
> IBEX-3 Orbit# 603 SC Replace ATS/Blind Acq Contact 40re Asc
>
> This will be blind acquisition. The transmitter off command for this
> contact is in the ATS. A separate transmitter off command will be uplinked
> at AOS just in case I am not able to up-link the ATS.
>
>
>
> The apogee Descending commands:
>
> Original descending commands started to execute @2023/04:04:10:01:48 and
> now they will be executing @2023/04:04:19:59:40. So, it is important to
> complete ATS replacement prior to the execution of these commands
> @2023/04:04:10:01:48.
>
>
>
> The apogee contact has been moved:
>
> IBEX,USHI01,DELETE,04/04/23,094,15:00:00,04/04/23,094,15:35:00,,LAHO 2K
> IBEX-3 Orbit# 603 Apogee Tracking Contact 43re APO
>
> IBEX,USHI01,ADD,04/05/23,095,13:00:00,04/05/23,095,13:35:00,,LAHO 2K
> IBEX-3 Orbit# 603 Apogee Tracking Contact 43re Desc
>
> The original Inertial maneuver executed @ 2023/04:04:11:57:46 and the new
> sun maneuver executes @2023/04:04:21:55:38. So the apogee contact had to be
> moved.
>
>
>
> The SSR contact at perigee has been extended to dump both orbits 602 and
> 603 data.
>
> IBEX,USHI01,DELETE,04/09/23,099,03:00:00,04/09/23,099,04:00:00,,LAHO 160K
> IBEX-3 Orbit# 603 SSR_Dump/Tracking Contact 13re Desc
>
> IBEX,USHI01,ADD,04/09/23,099,03:00:00,04/09/23,099,04:30:00,,LAHO 160K
> IBEX-3 Orbit# 603 SSR_Dump/Tracking Contact 13re Desc
>
>
>
> *All Contact changes have been confirmed at the time of the ATS generation*.
>
>
>
>
>
>
> Please note the following:
>
> 1. Apogee Sun Maneuver *04/04/2023 21:55:38*
>
>
>
> 1. Perigee Sun Maneuver* 04/09*/*2023 02:23:57*
>
>
>
> 3. Battery Balancing this orbit
>
> Begin 04/09/2023 10:00:00– End 04/09/2023 11:30:00
>
>
>
> 4. Command Load Constraint Violation Report (CCVR)
>
> IBEX_2023_090_o0603a_v002.ccvr
>
> # Input files: 1
>
> # IBEX_2023_090_o0603a_v002.scr
>
>
>
> ==========================
>
> HARD CONSTRAINT VIOLATIONS
>
> ==========================
>
> NO VIOLATIONS.
>
>
>
> ==========================
>
> SOFT CONSTRAINT VIOLATIONS
>
> ==========================
>
> IBX-CLC-006: Planned transmission at 2023/04/09 02:58:00 UTC - 2023/04/09
>
> 04:32:00 UTC exceeds the maximum contiguous transmission
> time of
>
> 5400 seconds
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2023/03/31 16:53:53 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2023/04/04 23:10:44 UTC
>
>
>
> ==============
>
> OTHER MESSAGES
>
> ==============
>
> NO MESSAGES.
>
>
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