[Isocops] IBEX Orbit #423 ATS Approval ( 07 - 16 Oct ) - v001 approval
Ken Fairchild
fair-play at comcast.net
Thu Sep 27 17:36:43 EDT 2018
All,
I have looked at the orbit 423 ATS,
IBEX_2018_280_o0423a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2018_280_o0423a_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_2018_280_o0423a_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_2018_280_o0423a_v001.oef,
and as verified with ibex_orbit.
There are no star tracker outages.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file,
IBEX_Orbit423_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 maneuver at perigee of orbit 422 left us pointing in safe directions for the orbit 423 arc A ascending and descending sequences:
ibex_rotate -o -u -0.978852,-0.183859,-0.089694 -w ibex-sun -t 2018/10:08:07:05:06
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.978852,-0.183859,-0.089694
which is R.A. +190.638 Decl. -5.146
missing R.A. +193.536 Decl. -5.818 (ibex-sun)
error is R.A. +2.898 Decl. +0.672
for a total 2.962 deg
ibex_rotate -o -u -0.978852,-0.183859,-0.089694 -w ibex-sun -t 2018/10:11:18:39:32
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.978852,-0.183859,-0.089694
which is R.A. +190.638 Decl. -5.146
missing R.A. +196.626 Decl. -7.085 (ibex-sun)
error is R.A. +5.988 Decl. +1.939
for a total 6.262 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 -0.960329,-0.251615,-0.120241 -w ibex-sun -t 2018/10:11:20:22:40
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.960329,-0.251615,-0.120241
which is R.A. +194.682 Decl. -6.906
missing R.A. +196.692 Decl. -7.111 (ibex-sun)
error is R.A. +2.010 Decl. +0.205
for a total 2.006 deg
ibex_rotate -o -u -0.960329,-0.251615,-0.120241 -w ibex-sun -t 2018/10:11:21:57:46
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.960329,-0.251615,-0.120241
which is R.A. +194.682 Decl. -6.906
missing R.A. +196.753 Decl. -7.135 (ibex-sun)
error is R.A. +2.071 Decl. +0.229
for a total 2.068 deg
ibex_rotate -o -u -0.960329,-0.251615,-0.120241 -w ibex-sun -t 2018/10:16:04:16:09
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI-0.960329,-0.251615,-0.120241
which is R.A. +194.682 Decl. -6.906
missing R.A. +200.824 Decl. -8.734 (ibex-sun)
error is R.A. +6.142 Decl.+1.828
for a total 6.354 deg
The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 424 apogee:
ibex_rotate -o -u -0.93651,-0.317939,-0.147861 -w ibex-sun -t 2018/10:16:06:48:45
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.936510,-0.317939,-0.147861
which is R.A. +198.752 Decl. -8.503
missing R.A. +200.928 Decl. -8.779 (ibex-sun)
error is R.A. +2.176 Decl. +0.276
for a total 2.169 deg
ibex_rotate -o -u -0.93651,-0.317939,-0.147861 -w ibex-sun -t 2018-10-21T01:31:17.571Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.936510,-0.317939,-0.147861
which is R.A. +198.752 Decl. -8.503
missing R.A. +205.282 Decl. -10.496 (ibex-sun)
error is R.A. +6.530 Decl. +1.993
for a total 6.742 deg
No Lo O-mode.
There is no overlap with orbit 422 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
> On September 25, 2018 at 10:41 AM "Perry, Timothy" <Timothy.Perry at OrbitalATK.com> wrote:
>
>
> All,
>
> Attached are the planning files for Orbit #423.
>
> Please respond to this thread with comments and approvals.
>
> Approvals are required by COB 27 Sept 18.
>
>
>
> Note the following:
>
> 1. Battery Balancing
>
> # Orbit# 423 PERIGEE Battery Balancing
>
> # 2018-10-16T15:54:21.674Z,Perigee,orbit:423
>
> @ECT_SetLongEclipseFlag TRUE $TIME=2018/10:16:15:00:00
>
> @ECT_SetLongEclipseFlag FALSE $TIME=2018/10:16:16:30:00
>
>
>
> 2. The second LAHO pass will be in the Orbit #424 ATS. The contact is at 17Re @10/17/18 05:00:00z.
>
>
>
> 3. IBEX_2018_280_o0423a_v001_.ccvr
>
>
>
> # IBEX_2018_280_o0423a_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 2018/10/08 05:15:27 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2018/10/11 21:27:46 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
>
>
>
>
>
>
>
> ---------------------------------------------
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> *********************
>
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