[Isocops] IBEX Orbit #499 ATS Approval (28 August - 6 September 2020) - v001 approval
KEN FAIRCHILD
fair-play at comcast.net
Thu Aug 13 16:42:06 EDT 2020
All,
I have looked at the orbit 499 ATS files,
IBEX_2020_241_o0499a_BUS_v001.scr
and
IBEX_2020_241_o0499a_INST_v001.scr,
and I approve.
The only constraint violations in
IBEX_2020_241_o0499a_BUS_v001.ccvr
and
IBEX_2020_241_o0499a_INST_v001.ccvr
are from the removal of the
ACT_SetSpinPulseProtectEnable Enable
commands (2); the violations are expected.
The PL commands in
IBEX_2020_241_o0499a_INST_v001.scr
match those in the v002 STF,
IBEX_2020_241_o0499a_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_241_o0499a_BUS_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts about 13 hours after 16 Re ascending and runs for 1.5- 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_Orbit499_Contacts.txt,
for all contacts (3).
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 498 left us pointing in safe directions for the orbit 499 arc A ascending and descending sequences:
ibex_rotate -o -u -0.889274,0.423115,0.173683 -w ibex-sun -t 2020/08:28:16:46:41
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.889274,+0.423115,+0.173683
which is R.A. +154.555 Decl. +10.002
missing R.A. +157.353 Decl. +9.454 (ibex-sun)
error is R.A. +2.798 Decl. +0.548
for a total 2.812 deg
ibex_rotate -o -u -0.889274,0.423115,0.173683 -w ibex-sun -t 2020/09:01:09:08:34
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.889274,+0.423115,+0.173683
which is R.A. +154.555 Decl. +10.002
missing R.A. +160.614 Decl. +8.194 (ibex-sun)
error is R.A. +6.059 Decl. +1.808
for a total 6.250 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 -0.921694,0.35978,0.145047 -w ibex-sun -t 2020/09:01:10:51:42
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.921694,+0.359780,+0.145047
which is R.A. +158.677 Decl. +8.340
missing R.A. +160.680 Decl. +8.169 (ibex-sun)
error is R.A. +2.003 Decl. +0.171
for a total 1.989 deg
ibex_rotate -o -u -0.921694,0.35978,0.145047 -w ibex-sun -t 2020/09:01:12:26:48
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.921694,+0.359780,+0.145047
which is R.A. +158.677 Decl. +8.340
missing R.A. +160.740 Decl. +8.146 (ibex-sun)
error is R.A. +2.063 Decl. +0.194
for a total 2.051 deg
ibex_rotate -o -u -0.921694,0.35978,0.145047 -w ibex-sun -t 2020/09:06:02:03:12
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.921694,+0.359780,+0.145047
which is R.A. +158.677 Decl. +8.340
missing R.A. +164.991 Decl. +6.420 (ibex-sun)
error is R.A. +6.314 Decl. +1.920
for a total 6.549 deg
The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 500 apogee:
ibex_rotate -o -u -0.949439,0.291487,0.116619 -w ibex-sun -t 2020/09:06:06:17:40
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.949439,+0.291487,+0.116619
which is R.A. +162.933 Decl. +6.697
missing R.A. +165.148 Decl. +6.347 (ibex-sun)
error is R.A. +2.215 Decl. +0.350
for a total 2.228 deg
ibex_rotate -o -u -0.949439,0.291487,0.116619 -w ibex-sun -t 2020-09-11T04:45:51.153Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.949439,+0.291487,+0.116619
which is R.A. +162.933 Decl. +6.697
missing R.A. +169.462 Decl. +4.547 (ibex-sun)
error is R.A. +6.529 Decl. +2.150
for a total 6.843 deg
Lo Background mode for the entire orbit.
There is no overlap with orbit 498 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
> On 08/11/2020 1:07 PM Perry, Timothy E [US] (IS) <timothy.perry at ngc.com> wrote:
>
>
>
> All,
>
> Attached are the planning files for Orbit #499
>
> Please respond to this thread with comments and approvals.
>
> Approvals are required by COB on 13 August 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. Orbit# 497 Reset Master Timer - 2020/08:19:04:45:00
>
>
> 6. Command Load Constraint Violation Report (CCVR)
>
> IBEX_2020_241_o0499a_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 2020/08/28 13:54:16 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2020/09/01 11:56:48 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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