[Isocops] [WARNING: MESSAGE ENCRYPTED]IBEX Orbit #487 ATS Approval ( 11 - 19 May 2020 ) - v001 approval
KEN FAIRCHILD
fair-play at comcast.net
Sun Apr 19 11:33:11 EDT 2020
All,
I have looked at the orbit 487 ATS files,
IBEX_2020_133_o0487a_BUS_v001.scr
and
IBEX_2020_133_o0487a_INST_v001.scr,
and I approve.
The only constraint violations in
IBEX_2020_133_o0487a_BUS_v001.ccvr
and
IBEX_2020_133_o0487a_INST_v001.ccvr
are from the removal of the
ACT_SetSpinPulseProtectEnable Enable
commands (2); the violations are expected.
The PL commands in
IBEX_2020_133_o0487a_INST_v001.scr
match those in the v002 STF,
IBEX_2020_131_o0487a_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_133_o0487a_BUS_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts just after 15 Re descending and runs for 7 hours. No despinning should 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_Orbit487_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 486 left us pointing in safe directions for the orbit 487 arc A ascending and descending sequences:
ibex_rotate -o -u 0.669273,0.685255,0.287227 -w ibex-sun -t 2020/05:11:03:54:12
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.669273,+0.685255,+0.287227
which is R.A. +45.676 Decl. +16.692
missing R.A. +48.189 Decl. +17.884 (ibex-sun)
error is R.A. +2.513 Decl. +1.192
for a total 2.679 deg
ibex_rotate -o -u 0.669273,0.685255,0.287227 -w ibex-sun -t 2020/05:14:16:09:50
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.669273,+0.685255,+0.287227
which is R.A. +45.676 Decl. +16.692
missing R.A. +51.731 Decl. +18.795 (ibex-sun)
error is R.A. +6.055 Decl. +2.103
for a total 6.138 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 0.612832,0.728974,0.305014 -w ibex-sun -t 2020/05:14:17:52:58
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.612832,+0.728974,+0.305014
which is R.A. +49.947 Decl. +17.759
missing R.A. +51.803 Decl. +18.814 (ibex-sun)
error is R.A. +1.856 Decl. +1.055
for a total 2.054 deg
ibex_rotate -o -u 0.612832,0.728974,0.305014 -w ibex-sun -t 2020/05:14:19:28:04
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.612832,+0.728974,+0.305014
which is R.A. +49.947 Decl. +17.759
missing R.A. +51.869 Decl. +18.831 (ibex-sun)
error is R.A. +1.922 Decl. +1.072
for a total 2.116 deg
ibex_rotate -o -u 0.612832,0.728974,0.305014 -w ibex-sun -t 2020/05:19:03:42:11
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.612832,+0.728974,+0.305014
which is R.A. +49.947 Decl. +17.759
missing R.A. +56.118 Decl. +19.812 (ibex-sun)
error is R.A. +6.171 Decl. +2.053
for a total 6.192 deg
The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 488 apogee:
ibex_rotate -o -u 0.551173,0.769104,0.323554 -w ibex-sun -t 2020/05:19:12:18:33
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.551173,+0.769104,+0.323554
which is R.A. +54.373 Decl. +18.878
missing R.A. +56.455 Decl. +19.867 (ibex-sun)
error is R.A. +2.082 Decl. +0.989
for a total 2.199 deg
ibex_rotate -o -u 0.551173,0.769104,0.323554 -w ibex-sun -t 2020-05-24T03:00:12.001Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.551173,+0.769104,+0.323554
which is R.A. +54.373 Decl. +18.878
missing R.A. +61.162 Decl. +20.802 (ibex-sun)
error is R.A. +6.789 Decl. +1.924
for a total 6.669 deg
No Lo O-mode.
There is no overlap with orbit 486 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
> On April 17, 2020 at 2:47 PM "Perry, Timothy E [US] (IS)" <Timothy.Perry at ngc.com> wrote:
>
>
> All,
>
> Attached are the planning files for Orbit #487
>
> Please respond to this thread with comments and approvals.
>
> Approvals are required by COB on 21 April 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 docx 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. Master Timer Command for Orbit #485
>
> # Orbit# 485 Reset Master Timer
>
> @EMR_StrobeMReset $TIME=2020/05:02:05:15:00
>
>
>
> 5. No Battery Balancing
>
>
>
> 6. Command Load Constraint Violation Report (CCVR)
>
> IBEX_2020_133_o0487a_v001.ccvr
>
>
>
> ==========================
>
> 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 2020/05/11 01:43:57 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2020/05/14 18:58:04 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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