[Isocops] IBEX Orbit# 414 ATS Approval (17 Jul 18 - 27 Jul 18) - v001 approval

Ken Fairchild fair-play at comcast.net
Sat Jul 7 09:02:49 EDT 2018


All,


Note:  Angle at orbit 415 apogee after the perigee sun precession maneuver: 4.656 deg


I have looked at the orbit 414 ATS,


IBEX_2018_198_o0414a_v001.scr,


and I approve.


The only constraint violations in


IBEX_2018_198_o0414a_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_198_o0414a_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_198_o0414a_v001.oef,


and as verified with ibex_orbit.


There are 3 star tracker outages; the 2nd and 3rd overlap.  The first outage starts 1 1/2 hours before 15 Re descending and runs for 4 hours.  The second outage starts abut 8 1/2 hours before perigee and the last outage ends about 18 hours later.  Some despinning may be required due to the first outage.


There is one moon in Lo FOV session in arc B.  The ATS start time is 1 1/2 hours after that in the OEF and the ATS end time is 2 1/2 hours before that in the OEF.  These differences are not unusual.


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


IBEX_Orbit414_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 413 left us pointing in safe directions for the orbit 414 arc A ascending and descending sequences:


ibex_rotate -o -u -0.386846,0.849681,0.358319 -w ibex-sun -t 2018/07:18:09:03:07

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.386846,+0.849681,+0.358319

which is R.A. +114.479 Decl. +20.997

missing R.A. +117.391 Decl. +21.030 (ibex-sun)

error is R.A. +2.912 Decl. +0.033

for a total 2.718 deg


ibex_rotate -o -u -0.386846,0.849681,0.358319 -w ibex-sun -t 2018/07:22:01:05:56

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.386846,+0.849681,+0.358319

which is R.A. +114.479 Decl. +20.997

missing R.A. +121.064 Decl. +20.356 (ibex-sun)

error is R.A. +6.585 Decl. +0.641

for a total 6.193 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 -0.455256,0.820932,0.344692 -w ibex-sun -t 2018/07:22:02:49:04

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.455256,+0.820932,+0.344692

which is R.A. +119.011 Decl. +20.163

missing R.A. +121.136 Decl. +20.342 (ibex-sun)

error is R.A. +2.125 Decl. +0.179

for a total 2.002 deg


ibex_rotate -o -u -0.455256,0.820932,0.344692 -w ibex-sun -t 2018/07:22:04:24:10

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.455256,+0.820932,+0.344692

which is R.A. +119.011 Decl. +20.163

missing R.A. +121.203 Decl. +20.330 (ibex-sun)

error is R.A. +2.192 Decl. +0.167

for a total 2.064 deg


ibex_rotate -o -u -0.455256,0.820932,0.344692 -w ibex-sun -t 2018/07:26:15:20:49

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.455256,+0.820932,+0.344692

which is R.A. +119.011 Decl. +20.163

missing R.A. +125.683 Decl. +19.423 (ibex-sun)

error is R.A. +6.672 Decl. +0.740

for a total 6.320 deg


The sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 415 apogee:


ibex_rotate -o -r +125.784 -d +19.397 -w ibex-sun -t 2018/07:26:17:55:40

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

points axis +1.000000,+0.000000,+0.000000

towards ECI-0.551542,+0.765182,+0.332112

which is R.A. +125.784 Decl. +19.397

missing R.A. +125.784 Decl. +19.397 (ibex-sun)

error is R.A. +0.000 Decl. +0.000

for a total 0.000 deg


ibex_rotate -o -r +125.784 -d +19.397 -w ibex-sun -t 2018-07-31T16:22:49.961Z

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.551542,+0.765182,+0.332112

which is R.A. +125.784 Decl. +19.397

missing R.A. +130.544 Decl. +18.224 (ibex-sun)

error is R.A. +4.760 Decl. +1.173

for a total 4.656 deg


No Lo O-mode.


There is no overlap with orbit 413 commands by manual inspection or by checking at


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


Command Approval Checklist is attached.


Ken



> On July 5, 2018 at 10:23 PM "Wesley, Sheral" <Sheral.Wesley at OrbitalATK.com> wrote:
> 
> 
>     Guys,
> 
>     Here are the planning files and ATS for Orbit# 414.
> 
>     Please respond to this email thread with your comments and questions.
> 
>     Approvals are required before 6 July 18 @1900 UTC
> 
>      
> 
>     Note the following:
> 
>     1.       PERIGEE Battery Balancing
> 
>     Orbit# 414 PERIGEE Battery Balancing
> 
>     # 2018-07-27T02:53:46.292Z,Perigee,orbit:414
> 
>       SetLongEclipseFlag TRUE $TIME=2018/07:27:02:00:00
> 
>     SetLongEclipseFlag FALSE $TIME=2018/07:27:03:30:00
> 
>      
> 
>     2.       Moon in Lo FOV
> 
>     # 2018-07-22T23:09:21.725Z,MoonInLoFovStart,orbit:414
> 
>     # 2018-07-23T22:24:30.328Z,MoonInLoFovStop,orbit:414
> 
>      
> 
>     3.       PERIGEE Sun Maneuver
> 
>     2018-07-26T13:54:24.365Z,StarTrackerOutageStart,dueTo:moon,orbit:414
> 
>     # 2018-07-26T17:52:08.837Z,StarTrackerOutageStop,dueTo:moon,orbit:414
> 
>      
> 
>     4.       Command Load Constraint Violation Report
> 
>     IBEX_2018_198_o0414a_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 2018/07/18 07:14:50 UTC
> 
>     IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                  transition to science mode at 2018/07/22 03:54:10 UTC
> 
>      
> 
>     ==============
> 
>     OTHER MESSAGES
> 
>     ==============
> 
>     NO MESSAGES.
> 
>      
> 
>      
> 
>      
> 
>     Sheral  R. Wesley
> 
>     Sr Systems Engineer
> 
>     IBEX , OCO2 Mission OPS
> 
>     CRS/CYGNUS Mission Planning
> 
>     Northrop Grumman Innovation Systems
> 
>     Bldg. 2   Room 1337
> 
>     Office (703) 406-5641
> 
>     Cell (202) 236-0802
> 
>      
> 
>      
> 
>      
> 
> 
> 
>     ---------------------------------------------
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>      Thank you. 
>     *********************
> 


 
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