[Isocops] IBEX Orbit#422 Approval ( 28 Sept - 7 Oct ) - v001 approval

Tue Sep 18 12:04:05 EDT 2018

All,

I have looked at the orbit 422 ATS,

IBEX_2018_271_o0422a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2018_271_o0422a_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_271_o0422a_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_271_o0422a_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_Orbit422_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 maneuver at perigee of orbit 421 left us pointing in safe directions for the orbit 422 arc A ascending and descending sequences:

ibex_rotate -o -u -0.998671,-0.042869,-0.028602 -w ibex-sun -t 2018/09:29:05:57:32

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.998671,-0.042869,-0.028602

which is R.A. +182.458 Decl. -1.639

missing R.A. +185.315 Decl. -2.324 (ibex-sun)

error is R.A. +2.857 Decl. +0.685

for a total 2.936 deg

ibex_rotate -o -u -0.998671,-0.042869,-0.028602 -w ibex-sun -t 2018/10:02:19:33:52

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.998671,-0.042869,-0.028602

which is R.A. +182.458 Decl. -1.639

missing R.A. +188.438 Decl. -3.654 (ibex-sun)

error is R.A. +5.980 Decl. +2.015

for a total 6.304 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 -0.991748,-0.113171,-0.06023 -w ibex-sun -t 2018/10:02:21:17:00

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.991748,-0.113171,-0.060230

which is R.A. +186.510 Decl. -3.453

missing R.A. +188.503 Decl. -3.681 (ibex-sun)

error is R.A. +1.993 Decl. +0.228

for a total 2.002 deg

ibex_rotate -o -u -0.991748,-0.113171,-0.06023 -w ibex-sun -t 2018/10:02:22:52:06

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.991748,-0.113171,-0.060230

which is R.A. +186.510 Decl. -3.453

missing R.A. +188.563 Decl. -3.705 (ibex-sun)

error is R.A. +2.053 Decl. +0.252

for a total 2.064 deg

ibex_rotate -o -u -0.991748,-0.113171,-0.06023 -w ibex-sun -t 2018/10:07:08:22:15

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.991748,-0.113171,-0.060230

which is R.A. +186.510 Decl. -3.453

missing R.A. +192.691 Decl. -5.414 (ibex-sun)

error is R.A. +6.181 Decl. +1.961

for a total 6.466 deg

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 423 apogee:

ibex_rotate -o -u -0.978852,-0.183859,-0.089694 -w ibex-sun -t 2018/10:07:10:59:15

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. +192.794 Decl. -5.461 (ibex-sun)

error is R.A. +2.156 Decl. +0.315

for a total 2.170 deg

ibex_rotate -o -u -0.978852,-0.183859,-0.089694 -w ibex-sun -t 2018-10-12T06:07:53.545Z

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. +197.068 Decl. -7.258 (ibex-sun)

error is R.A. +6.430 Decl. +2.112

for a total 6.732 deg

No Lo O-mode.

There is no overlap with orbit 421 commands by manual inspection or by checking at

http://ibex.unh.edu/cgi-bin/ats.cgi.

Command Approval Checklist is attached.

Ken

> On September 17, 2018 at 3:57 PM "Perry, Timothy" <Timothy.Perry at OrbitalATK.com> wrote:
> 
> 
>     All,
> 
>         Attached are the planning files for Orbit # 422.
> 
>     Please respond to this thread with comments and approvals.
> 
>     Approvals are required by COB 18 Sept 18.
> 
>     Sorry for the short notice. I missed the email on Friday.
> 
>      
> 
>     Note the following:
> 
>     1.    No Battery Balancing this orbit
> 
>     2.    CCVR Report
> 
>         # Input files:         1
> 
>         #   IBEX_2018_271_o0422a_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 2018/09/29 04:09:16 UTC
> 
>         IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                      transition to science mode at 2018/10/02 22:22:06 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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