[Isocops] IBEX Orbit #433 ATS Approval ( 05 - 14 Jan ) - v001 approval
KEN FAIRCHILD
fair-play at comcast.net
Mon Dec 24 11:25:53 EST 2018
All,
Note: Angle at orbit 433 arc B descending after the apogee sun precession maneuver: 4.150 deg
I have looked at the orbit 433 ATS,
IBEX_2019_005_o0433a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2019_005_o0433a_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_005_o0433a_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_005_o0433a_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts 2- days after 15 Re ascending and runs for 4+ 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_Orbit433_Contacts.txt,
for all contacts (3).
There is an eclipse near perigee. The LE flag commands are correct, agree with Ryan's timing recommendations and are offset by enough time from other commands.
The inertial maneuver at perigee of orbit 432 left us pointing in safe directions for the orbit 433 arc A ascending and descending sequences:
ibex_rotate -o -u 0.265226,-0.880525,-0.392851 -w ibex-sun -t 2019/01:05:14:55:25
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.265226,-0.880525,-0.392851
which is R.A. +286.763 Decl. -23.132
missing R.A. +286.007 Decl. -22.646 (ibex-sun)
error is R.A. +0.756 Decl. +0.486
for a total 0.850 deg
ibex_rotate -o -u 0.265226,-0.880525,-0.392851 -w ibex-sun -t 2019/01:09:14:28:05
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.265226,-0.880525,-0.392851
which is R.A. +286.763 Decl. -23.132
missing R.A. +290.331 Decl. -22.125 (ibex-sun)
error is R.A. +3.568 Decl. +1.007
for a total 3.443 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 +290.411 -d -22.114 -w ibex-sun -t 2019/01:09:16:16:13
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.323097,-0.868270,-0.376451
which is R.A. +290.411 Decl. -22.114
missing R.A. +290.411 Decl. -22.114 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +290.411 -d -22.114 -w ibex-sun -t 2019/01:09:17:46:19
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.323097,-0.868270,-0.376451
which is R.A. +290.411 Decl. -22.114
missing R.A. +290.478 Decl. -22.104 (ibex-sun)
error is R.A. +0.067 Decl. +0.010
for a total 0.063 deg
ibex_rotate -o -r +290.411 -d -22.114 -w ibex-sun -t 2019/01:13:18:44:31
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.323097,-0.868270,-0.376451
which is R.A. +290.411 Decl. -22.114
missing R.A. +294.823 Decl. -21.452 (ibex-sun)
error is R.A. +4.412 Decl. +0.662
for a total 4.150 deg
The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 434 apogee:
ibex_rotate -o -u 0.417363,-0.829655,-0.370784 -w ibex-sun -t 2019/01:13:21:15:51
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.417363,-0.829655,-0.370784
which is R.A. +296.705 Decl. -21.764
missing R.A. +294.942 Decl. -21.438 (ibex-sun)
error is R.A. +1.763 Decl. +0.326
for a total 1.671 deg
ibex_rotate -o -u 0.417363,-0.829655,-0.370784 -w ibex-sun -t 2019-01-18T21:24:15.367Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.417363,-0.829655,-0.370784
which is R.A. +296.705 Decl. -21.764
missing R.A. +300.360 Decl. -20.510 (ibex-sun)
error is R.A. +3.655 Decl. +1.254
for a total 3.632 deg
No Lo O-mode.
There is no overlap with orbit 432 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
> On December 22, 2018 at 4:29 PM "Perry, Timothy" <Timothy.Perry at ngc.com> wrote:
>
>
> All,
>
> Attached are the planning files for Orbit #433.
>
> Please respond to this thread with comments and approvals.
>
> Approvals are required by COB 25 Dec 2018.
>
>
>
> Note the following:
>
> 1. # Orbit 433 Moderate Eclipse
>
> # 2019-01-14T06:09:43.282Z,EclipseEntry,moderate:true,long:false,orbit:433
>
> # 2019-01-14T07:16:06.256Z,EclipseExit,moderate:true,long:false,orbit:433
>
>
>
> 2. IBEX_2019_005_o0433a_v001_.ccvr
>
> # Input files: 1
>
> # IBEX_2019_005_o0433a_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 2019/01/05 13:15:47 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2019/01/09 17:16:19 UTC
>
>
>
> ==============
>
> OTHER MESSAGES
>
> ==============
>
> NO MESSAGES.
>
>
>
>
>
>
>
>
>
> Timothy E. Perry
>
> CRS, IBEX, OCO-2 & TESS
>
> Mission Operations
>
> Tim.perry at ngc.com mailto:Tim.perry at ngc.com
>
> Office (703) 406-5976
>
> Cell (301) 606-1430
>
> Corp Cell (571) 447-8977
>
>
>
> [cid:image002.png at 01D43627.CCEBFFF0]
>
>
>
>
>
>
>
> ---------------------------------------------
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> *********************
>
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