[Isocops] IBEX Orbit #513 ATS Approval (3 - 11 Jan 21) - v001 approval
fair-play at comcast.net
fair-play at comcast.net
Wed Dec 23 11:51:28 EST 2020
All,
Note: Angle at orbit 513 arc B descending after the apogee sun precession maneuver: 4.002 deg
I have looked at the orbit 513 ATS files,
IBEX_2021_002_o0513a_BUS_v001.scr
and
IBEX_2021_002_o0513a_INST_v001.scr,
and I approve.
The only constraint violations in
IBEX_2021_002_o0513a_BUS_v001.ccvr
and
IBEX_2021_002_o0513a_INST_v001.ccvr
are from the removal of the
ACT_SetSpinPulseProtectEnable Enable
commands (2); the violations are expected.
The PL commands in
IBEX_2021_002_o0513a_INST_v001.scr
match those in the v002 STF,
IBEX_2021_002_o0513a_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_2021_002_o0513a_BUS_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts 1+ day before apogee and runs for 3+ 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_Orbit513_Contacts.txt,
for all contacts (2).
We are doing battery cell balancing this orbit and the balancing commands are correct and offset by enough time from other commands.
The inertial precession maneuver at perigee of orbit 512 left us pointing in safe directions for the orbit 513 arc A ascending and descending sequences:
ibex_rotate -o -u 0.229593,-0.888923,-0.396363 -w ibex-sun -t 2021/01:03:00:40:06
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.229593,-0.888923,-0.396363
which is R.A. +284.482 Decl. -23.351
missing R.A. +283.683 Decl. -22.863 (ibex-sun)
error is R.A. +0.799 Decl. +0.488
for a total 0.882 deg
ibex_rotate -o -u 0.229593,-0.888923,-0.396363 -w ibex-sun -t 2021/01:06:22:55:37
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.229593,-0.888923,-0.396363
which is R.A. +284.482 Decl. -23.351
missing R.A. +287.989 Decl. -22.394 (ibex-sun)
error is R.A. +3.507 Decl. +0.957
for a total 3.370 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 +288.069 -d -22.383 -w ibex-sun -t 2021/01:07:00:43:45
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.286794,-0.879058,-0.380796
which is R.A. +288.069 Decl. -22.383
missing R.A. +288.069 Decl. -22.383 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +288.069 -d -22.383 -w ibex-sun -t 2021/01:07:02:13:51
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.286794,-0.879058,-0.380796
which is R.A. +288.069 Decl. -22.383
missing R.A. +288.136 Decl. -22.375 (ibex-sun)
error is R.A. +0.067 Decl. +0.008
for a total 0.062 deg
ibex_rotate -o -r +288.069 -d -22.383 -w ibex-sun -t 2021/01:11:00:18:40
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.286794,-0.879058,-0.380796
which is R.A. +288.069 Decl. -22.383
missing R.A. +292.347 Decl. -21.830 (ibex-sun)
error is R.A. +4.278 Decl. +0.553
for a total 4.002 deg
The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 514 apogee:
ibex_rotate -o -u 0.379947,-0.844631,-0.377146 -w ibex-sun -t 2021/01:11:03:13:43
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.379947,-0.844631,-0.377146
which is R.A. +294.220 Decl. -22.157
missing R.A. +292.485 Decl. -21.816 (ibex-sun)
error is R.A. +1.735 Decl. +0.341
for a total 1.645 deg
ibex_rotate -o -u 0.379947,-0.844631,-0.377146 -w ibex-sun -t 2021-01-15T21:55:53.077Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.379947,-0.844631,-0.377146
which is R.A. +294.220 Decl. -22.157
missing R.A. +297.715 Decl. -20.981 (ibex-sun)
error is R.A. +3.495 Decl. +1.176
for a total 3.456 deg
Lo Normal mode for the entire orbit.
There is no overlap with orbit 512 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
> On 12/18/2020 2:48 PM Perry, Timothy E [US] (IS) <timothy.perry at ngc.com> wrote:
>
>
>
> All,
>
> Attached are the planning files for Orbit #513
>
> Please respond to this thread with comments and approvals.
>
> Approvals are required by COB on 23 December 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. Battery Balancing this orbit
>
> # Orbit 513 Battery Balancing
>
> # 2021-01-11T11:06:53.696Z,Perigee,orbit:513
>
> Begin - 2021/01:11:11:00:00 End - 2021/01:11:12:30:00
>
>
>
> 5. APOGEE: Sun Maneuver - $TIME=2021/01:07:00:28:45
>
>
>
> 6. # Orbit# 490 Reset Master Timer - 2020/12:25:01:15:00
>
>
>
> 7. Command Load Constraint Violation Report (CCVR)
>
> IBEX_2021_002_o0513a_v001.ccvr
>
> # Input files: 1
>
> # IBEX_2021_002_o0513a_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 2021/01/02 22:33:30 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2021/01/07 01:43:51 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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