[Isocops] IBEX Orbit #421 ATS Approval ( 19 - 28 Sept ) - v002 approval

Mon Sep 10 08:45:45 EDT 2018

All,

I have looked at the orbit 421 ATS,

IBEX_2018_262_o0421a_v002.scr,

and I approve.

The only constraint violations in

IBEX_2018_262_o0421a_v001_.ccvr

are from the removal of the

ACT_SetSpinPulseProtectEnable Enable

commands (2); the violations are expected.

The PL commands in the v002 ATS match those in the v002 STF,

IBEX_2018_262_o0421a_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_262_0421a_v001.oef,

and as verified with ibex_orbit.

There is one star tracker outage.  The outage starts 1+ days after 15 Re ascending and runs for 1+ days.  Some despinning may be required due to this outage.

There are no moon in Lo FOV sessions.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file,

IBEX_Orbit421_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 maneuver at perigee of orbit 420 left us pointing in safe directions for the orbit 421 arc A ascending and descending sequences:

ibex_rotate -o -u -0.994907,0.095746,0.031498 -w ibex-sun -t 2018/09:20:09:02:30

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.994907,+0.095746,+0.031498

which is R.A. +174.503 Decl. +1.805

missing R.A. +177.336 Decl. +1.129 (ibex-sun)

error is R.A. +2.833 Decl. +0.676

for a total 2.911 deg

ibex_rotate -o -u -0.994907,0.095746,0.031498 -w ibex-sun -t 2018/09:23:20:19:28

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.994907,+0.095746,+0.031498

which is R.A. +174.503 Decl. +1.805

missing R.A. +180.356 Decl. -0.169 (ibex-sun)

error is R.A. +5.853 Decl. +1.974

for a total 6.177 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 -0.999628,0.027259,6.46E-4 -w ibex-sun -t 2018/09:23:22:02:36

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.999628,+0.027259,+0.000646

which is R.A. +178.438 Decl. +0.037

missing R.A. +180.421 Decl. -0.196 (ibex-sun)

error is R.A. +1.983 Decl. +0.233

for a total 1.997 deg

ibex_rotate -o -u -0.999628,0.027259,6.46E-4 -w ibex-sun -t 2018/09:23:23:37:42

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.999628,+0.027259,+0.000646

which is R.A. +178.438 Decl. +0.037

missing R.A. +180.481 Decl. -0.221 (ibex-sun)

error is R.A. +2.043 Decl. +0.258

for a total 2.059 deg

ibex_rotate -o -u -0.999628,0.027259,6.46E-4 -w ibex-sun -t 2018/09:28:07:08:34

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.999628,+0.027259,+0.000646

which is R.A. +178.438 Decl. +0.037

missing R.A. +184.486 Decl. -1.916 (ibex-sun)

error is R.A. +6.048 Decl. +1.953

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 422 apogee:

ibex_rotate -o -u -0.998671,-0.042869,-0.028602 -w ibex-sun -t 2018/09:28:09:42:42

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. +184.585 Decl. -1.962 (ibex-sun)

error is R.A. +2.127 Decl. +0.323

for a total 2.151 deg

ibex_rotate -o -u -0.998671,-0.042869,-0.028602 -w ibex-sun -t 2018-10-03T07:03:47.188Z

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. +188.874 Decl. -3.833 (ibex-sun)

error is R.A. +6.416 Decl. +2.194

for a total 6.774 deg

No Lo O-mode.

There is no overlap with orbit 420 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken

> On September 7, 2018 at 10:37 AM "Perry, Timothy" <Timothy.Perry at OrbitalATK.com> wrote:
> 
> 
>     All,
> 
>        Attached are the planning files for Orbit #421.
> 
>     Please respond to this thread with comments and approvals.
> 
>     Approvals are required before 9 Sept 2018 @ 16:00 gmt.
> 
>      
> 
>     Note the following:
> 
>     1.    # Orbit# 421 PERIGEE Battery Balancing 
> 
>     # 2018-09-28T18:34:41.784Z,Perigee,orbit:421 
> 
>     @ECT_SetLongEclipseFlag TRUE $TIME=2018/09:28:18:00:00
> 
>     @ECT_SetLongEclipseFlag FALSE $TIME=2018/09:28:19:30:00  
> 
>      
> 
>     # Input files:         1
> 
>     #   IBEX_2018_262_o0421a_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 2018/09/20 07:17:47 UTC
> 
>     IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                  transition to science mode at 2018/09/23 23:07:42 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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