[Isocops] IBEX Orbit# 406 ATS Approval (4 May 18 - 13 May 18) - v001 approval

Ken Fairchild fair-play at comcast.net
Thu Apr 26 01:10:00 EDT 2018


All,


I have looked at the orbit 406 ATS,


IBEX_2018_124_o0406a_v001.scr,


and I approve.


The only constraint violations in


IBEX_2018_124_o0406a_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_124_o0406a_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_124_o0406a_v001.oef,


and as verified with ibex_orbit.


There are no star tracker outages.


There is one moon in Lo FOV session in arc A.  The ATS start time is 5+ hours after that in the OEF and the ATS end time is 2.5 hours after 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_Orbit406_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 405 left us pointing in safe directions for the orbit 406 arc A ascending and descending sequences:


ibex_rotate -o -u 0.745068,0.615608,0.256711 -w ibex-sun -t 2018/05:05:07:44:47

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  +0.745068,+0.615608,+0.256711

 which is     R.A.  +39.565 Decl. +14.875

 missing      R.A.  +42.044 Decl. +16.167 (ibex-sun)

 error is     R.A.   +2.479 Decl.  +1.292

 for a total  2.715 deg


ibex_rotate -o -u 0.745068,0.615608,0.256711 -w ibex-sun -t 2018/05:08:21:40:13

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  +0.745068,+0.615608,+0.256711

 which is     R.A.  +39.565 Decl. +14.875

 missing      R.A.  +45.625 Decl. +17.194 (ibex-sun)

 error is     R.A.   +6.060 Decl.  +2.319

 for a total  6.268 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 0.69243,0.665991,0.277482 -w ibex-sun -t 2018/05:08:23:23:47

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  +0.692430,+0.665991,+0.277482

 which is     R.A.  +43.885 Decl. +16.110

 missing      R.A.  +45.695 Decl. +17.215 (ibex-sun)

 error is     R.A.   +1.810 Decl.  +1.105

 for a total  2.056 deg


ibex_rotate -o -u 0.69243,0.665991,0.277482 -w ibex-sun -t 2018/05:09:00:58:27
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.692430,+0.665991,+0.277482
which is R.A. +43.885 Decl. +16.110
missing R.A. +45.760 Decl. +17.233 (ibex-sun)
error is R.A. +1.875 Decl. +1.123
for a total 2.119 deg


ibex_rotate -o -u 0.69243,0.665991,0.277482 -w ibex-sun -t 2018/05:13:11:33:34

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  +0.692430,+0.665991,+0.277482

 which is     R.A.  +43.885 Decl. +16.110

 missing      R.A.  +50.008 Decl. +18.396 (ibex-sun)

 error is     R.A.   +6.123 Decl.  +2.286

 for a total  6.278 deg


The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver at at orbit 407 apogee:


ibex_rotate -o -u 0.634157,0.713064,0.298974 -w ibex-sun -t 2018/05:13:14:10:20

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  +0.634157,+0.713064,+0.298974

 which is     R.A.  +48.352 Decl. +17.396

 missing      R.A.  +50.108 Decl. +18.418 (ibex-sun)

 error is     R.A.   +1.756 Decl.  +1.022

 for a total  1.958 deg


ibex_rotate -o -u 0.634157,0.713064,0.298974 -w ibex-sun -t 2018-05-18T14:55:54.528Z

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  +0.634157,+0.713064,+0.298974

 which is     R.A.  +48.352 Decl. +17.396

 missing      R.A.  +55.187 Decl. +19.577 (ibex-sun)

 error is     R.A.   +6.835 Decl.  +2.181

 for a total  6.839 deg


No Lo O-mode.


There is no overlap with orbit 405 commands by manual inspection or by checking at


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


Command Approval Checklist is attached.


Ken



> On April 22, 2018 at 12:33 PM "Wesley, Sheral" <Sheral.Wesley at OrbitalATK.com> wrote:
> 
> 
>     Guys,
> 
>     Here are the planning files and ATS for Orbit# 406.
> 
>     Please respond to this email thread with your comments and approvals
> 
>     Approvals are required before 25 Apr 18 @1800 UTC
> 
>      
> 
>     Note the following
> 
>     1.       Battery Balancing
> 
>     Orbit# 406 PERIGEE Battery Balancing
> 
>     # 2018-05-13T22:41:40.118Z,Perigee,orbit:406
> 
>     SetLongEclipseFlag TRUE $TIME=2018/05:13:21:00:00
> 
>     SetLongEclipseFlag FALSE $TIME=2018/05:13:22:30:00
> 
>      
> 
>     2.       Moon in Lo FOV
> 
>     2018-05-05T16:08:16.003Z,MoonInLoFovStart,orbit:406
> 
>     2018-05-06T09:17:04.457Z,MoonInLoFovStop,orbit:406
> 
>      
> 
>     3.       Command Load Constraint Violation Report
> 
>     IBEX_2018_124_o0406a_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 2018/05/05 05:59:05 UTC
> 
>     IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                  transition to science mode at 2018/05/09 00:28:27 UTC
> 
>      
> 
>     ==============
> 
>     OTHER MESSAGES
> 
>     ==============
> 
>     NO MESSAGES.
> 
>      
> 
>      
> 
>      
> 
>     Sheral  R. Wesley
> 
>     Sr Systems Engineer
> 
>     IBEX , OCO2 Mission OPS
> 
>     CRS/CYGNUS Mission Planning
> 
>     Bldg. 2   Room 1337
> 
>     Office (703) 406-5641
> 
>     Cell (202) 236-0802
> 
>     [cid:image001.jpg at 01D04F6C.5A1C97F0]
> 
>      
> 
> 
> 
>     ---------------------------------------------
>     Notice: This e-mail is intended solely for use of the individual or entity to which it is addressed and may contain information that is proprietary, privileged and/or exempt from disclosure under applicable law. If the reader is not the intended recipient or agent responsible for delivering the message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. This communication may also contain data subject to U.S. export laws. If so, data subject to the International Traffic in Arms Regulation cannot be disseminated, distributed, transferred, or copied, whether incorporated or in its original form, to foreign nationals residing in the U.S. or abroad, absent the express prior approval of the U.S. Department of State. Data subject to the Export Administration Act may not be disseminated, distributed, transferred or copied contrary to U. S. Department of Commerce regulations. If you have received this communication in error, please notify the sender by reply e-mail and destroy the e-mail message and any physical copies made of the communication.
>      Thank you. 
>     *********************
> 
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