[Isocops] IBEX Orbit #505 ATS Approval ( 23 Oct 20 - 1 Nov 20) - v001 approval
KEN FAIRCHILD
fair-play at comcast.net
Thu Oct 8 14:05:27 EDT 2020
All,
Note: Angle at orbit 505 arc B descending after the apogee sun precession maneuver: 4.199 deg
Angle at orbit 506 apogee after the perigee sun precession maneuver: 4.726 deg
I have looked at the orbit 505 ATS files,
IBEX_2020_296_o0505a_BUS_v001.scr
and
IBEX_2020_296_o0505a_INST_v001.scr,
and I approve.
The only constraint violations in
IBEX_2020_296_o0505a_BUS_v001.ccvr
and
IBEX_2020_296_o0505a_INST_v001.ccvr
are from the removal of the
ACT_SetSpinPulseProtectEnable Enable
commands (2); the violations are expected.
The PL commands in
IBEX_2020_296_o0505a_INST_v001.scr
match those in the v002 STF,
IBEX_2020_296_o0505a_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_2020_296_o0505a_BUS_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts 1.5+ days before apogee and ends 7 hours after perigee. Some despinning will be required due to the very long outage.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file,
IBEX_Orbit505_Contacts.txt,
for all contacts (2).
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 504 left us pointing in safe directions for the orbit 505 arc A ascending and descending sequences:
ibex_rotate -o -u -0.891973,-0.41113,-0.188033 -w ibex-sun -t 2020/10:22:22:43:37
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.891973,-0.411130,-0.188033
which is R.A. +204.746 Decl. -10.838
missing R.A. +207.658 Decl. -11.397 (ibex-sun)
error is R.A. +2.912 Decl. +0.559
for a total 2.911 deg
ibex_rotate -o -u -0.891973,-0.41113,-0.188033 -w ibex-sun -t 2020/10:27:00:47:13
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.891973,-0.411130,-0.188033
which is R.A. +204.746 Decl. -10.838
missing R.A. +211.456 Decl. -12.737 (ibex-sun)
error is R.A. +6.710 Decl. +1.899
for a total 6.837 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 +211.528 -d -12.761 -w ibex-sun -t 2020/10:27:02:35:12
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.831331,-0.509999,-0.220885
which is R.A. +211.528 Decl. -12.761
missing R.A. +211.528 Decl. -12.761 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +211.528 -d -12.761 -w ibex-sun -t 2020/10:27:04:05:27
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.831331,-0.509999,-0.220885
which is R.A. +211.528 Decl. -12.761
missing R.A. +211.588 Decl. -12.781 (ibex-sun)
error is R.A. +0.060 Decl. +0.020
for a total 0.062 deg
ibex_rotate -o -r +211.528 -d -12.761 -w ibex-sun -t 2020/10:31:05:08:26
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.831331,-0.509999,-0.220885
which is R.A. +211.528 Decl. -12.761
missing R.A. +215.603 Decl. -14.149 (ibex-sun)
error is R.A. +4.075 Decl. +1.388
for a total 4.199 deg
The sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 506 apogee:
ibex_rotate -o -r +215.767 -d -14.210 -w ibex-sun -t 2020/10:31:08:58:46
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.786574,-0.566607,-0.245477
which is R.A. +215.767 Decl. -14.210
missing R.A. +215.767 Decl. -14.210 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +215.767 -d -14.210 -w ibex-sun -t 2020-11-05T04:40:43.435Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.786574,-0.566607,-0.245477
which is R.A. +215.767 Decl. -14.210
missing R.A. +220.414 Decl. -15.686 (ibex-sun)
error is R.A. +4.647 Decl. +1.476
for a total 4.726 deg
Lo Normal mode for the entire orbit.
There is no overlap with orbit 504 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
> On 10/05/2020 1:12 PM Perry, Timothy E [US] (IS) <timothy.perry at ngc.com> wrote:
>
>
>
> All,
>
> Attached are the planning files for Orbit #505
>
> Please respond to this thread with comments and approvals.
>
> Approvals are required by COB on 08 October 2020
>
>
> Please note the following:
>
> 1. I generated 3 separate ATS files BUS, INST and a complete file. The BUS and INST will be the files to be uplinked. The complete ATS, I used as a sanity check to see how the commands lined up. Since we are in a new phase of ATS generation. IF you have any ideas of doing this differently, let me know.
>
>
> 1. The 3 ATS files have been changed to word files and encrypted. I will send out another email with the password. The files that have been transferred via MFT have not been encrypted and are still text files.
>
>
> 1. I moved the 2 House Keeping commands from the INST ATS to the BUS ATS. I commented out the 2 commands in the INST ATS. If for some reason we were unable to uplink the INST Commands for this orbit, we would have been in the wrong spacecraft state for executing the maneuver commands.
>
>
> 1. No Battery Balancing this orbit
>
>
> 5. Apogee: Sun Maneuver - 2020/10:27:02:20:12
>
>
> 6. PERIGEE: Sun Maneuver - 2020/10:31:08:43:46
>
>
> 7. Orbit# 503 Reset Master Timer - 2020/10:13:14:45:00
>
>
> 8. Command Load Constraint Violation Report (CCVR)
>
> IBEX_2020_296_o0505a_v001.ccvr
>
> # Input files: 1
>
> # IBEX_2020_296_o0505a_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 2020/10/22 19:31:57 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2020/10/27 03:35:27 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
>
>
>
> [cid:image001.png at 01D542D6.6047A400]
>
>
>
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