[Isocops] IBEX Orbit #457 ATS Approval ( 12 - 21 Aug 2019 ) - v001 approval
KEN FAIRCHILD
fair-play at comcast.net
Thu Aug 1 10:40:00 EDT 2019
All,
I have looked at the orbit 457 ATS,
IBEX_2019_224_o0457a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2019_224_o0457a_v001.ccvr
are from the removal of the
ACT_SetSpinPulseProtectEnable Enable
commands (2); the violations are expected.
The PL commands in the v001 ATS match those in the v002 STF,
IBEX_2019_224_o0457a_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_2019_224_o0457a_v001.oef,
and as verified with ibex_orbit.
There are two star tracker outages. The first starts at perigee of orbit 456 and runs for 1.5- days. The second starts 1+ hours after perigee and runs for 4+ 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_Orbit457_Contacts.txt,
for all contacts (3).
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 456 left us pointing in safe directions for the orbit 457 arc A ascending and descending sequences:
ibex_rotate -o -u -0.728296,0.632273,0.264227 -w ibex-sun -t 2019/08:12:18:36:13
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.728296,+0.632273,+0.264227
which is R.A. +139.037 Decl. +15.321
missing R.A. +141.898 Decl. +14.951 (ibex-sun)
error is R.A. +2.861 Decl. +0.370
for a total 2.786 deg
ibex_rotate -o -u -0.728296,0.632273,0.264227 -w ibex-sun -t 2019/08:16:06:16:48
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.728296,+0.632273,+0.264227
which is R.A. +139.037 Decl. +15.321
missing R.A. +145.126 Decl. +13.919 (ibex-sun)
error is R.A. +6.089 Decl. +1.402
for a total 6.056 deg
The inertial 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 -0.776479,0.582107,0.241312 -w ibex-sun -t 2019/08:16:07:59:56
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.776479,+0.582107,+0.241312
which is R.A. +143.142 Decl. +13.964
missing R.A. +145.194 Decl. +13.897 (ibex-sun)
error is R.A. +2.052 Decl. +0.067
for a total 1.993 deg
ibex_rotate -o -u -0.776479,0.582107,0.241312 -w ibex-sun -t 2019/08:16:09:35:02
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.776479,+0.582107,+0.241312
which is R.A. +143.142 Decl. +13.964
missing R.A. +145.257 Decl. +13.877 (ibex-sun)
error is R.A. +2.115 Decl. +0.087
for a total 2.055 deg
ibex_rotate -o -u -0.776479,0.582107,0.241312 -w ibex-sun -t 2019/08:20:18:19:37
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.776479,+0.582107,+0.241312
which is R.A. +143.142 Decl. +13.964
missing R.A. +149.423 Decl. +12.458 (ibex-sun)
error is R.A. +6.281 Decl. +1.506
for a total 6.297 deg
The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 458 apogee:
ibex_rotate -o -u -0.822081,0.525925,0.218143 -w ibex-sun -t 2019/08:20:21:07:40
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.822081,+0.525925,+0.218143
which is R.A. +147.391 Decl. +12.600
missing R.A. +149.529 Decl. +12.415 (ibex-sun)
error is R.A. +2.138 Decl. +0.185
for a total 2.096 deg
ibex_rotate -o -u -0.822081,0.525925,0.218143 -w ibex-sun -t 2019-08-25T17:57:51.954Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.822081,+0.525925,+0.218143
which is R.A. +147.391 Decl. +12.600
missing R.A. +153.906 Decl. +10.802 (ibex-sun)
error is R.A. +6.515 Decl. +1.798
for a total 6.628 deg
No Lo O-mode.
There is no overlap with orbit 456 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
> On July 29, 2019 at 4:24 PM "Perry, Timothy" <Timothy.Perry at ngc.com> wrote:
>
>
> All,
>
> Attached are the planning files for Orbit #457
>
> Please respond to this thread with comments and approvals.
>
> Approvals are required by COB 01 Aug 2019.
>
>
> Please note the following:
>
> 1. # Orbit 457 Battery Balancing
>
> # 2019-08-21T05:19:40.310Z,Perigee,orbit:457
>
> @ECT_SetLongEclipseFlag TRUE $TIME=2019/08:21:05:00:00
>
> @ECT_SetLongEclipseFlag FALSE $TIME=2019/08:21:06:30:00
>
>
>
> 2. Command Load Constraint Violation Report (CCVR)
>
> IBEX_2019_224_o0457a_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 2019/08/12 16:45:28 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2019/08/16 09:05:02 UTC
>
>
>
> ==============
>
> OTHER MESSAGES
>
> ==============
>
> NO MESSAGES.
>
>
>
>
>
> Timothy E.Perry
>
> CRS IBEX OCO-2
>
> Mission Operations
>
> tim.perry at ngc.com
>
> Office (703) 406-5976
>
> Cell (301) 606-1430
>
>
>
> [cid:image001.png at 01D542D6.6047A400]
>
>
>
>
>
>
>
> ---------------------------------------------
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> *********************
>
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