[Isocops] IBEX Orbit #437 ATS Approval ( Feb 11 - 20 ) - v001 approval

KEN FAIRCHILD fair-play at comcast.net
Wed Jan 30 09:41:30 EST 2019 

All,


Note: Angle at orbit 438 apogee after the perigee sun precession maneuver: 5.021 deg


I have looked at the orbit 437 ATS,


IBEX_2019_041_o0437a_v001.scr,


and I approve.


The only constraint violations in


IBEX_2019_041_o0437a_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_2019_041_o0437a_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_2019_041_o0437a_v001.oef,


and as verified with ibex_orbit.


There is one star tracker outage.  The outage starts almost 3 days before 15 Re descending and runs for 4- days.  Some despinning may be required due to this outage.


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


IBEX_Orbit437_Contacts.txt,


for all contacts (3).


The inertial maneuver at perigee of orbit 436 left us pointing in safe directions for the orbit 437 arc A ascending and descending sequences:


ibex_rotate -o -u 0.794949,-0.552484,-0.250633 -w ibex-sun -t 2019/02:11:05:45:31

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.794949,-0.552484,-0.250633

which is R.A. +325.201 Decl. -14.515

missing R.A. +324.331 Decl. -14.210 (ibex-sun)

error is R.A. +0.870 Decl. +0.305

for a total 0.897 deg


ibex_rotate -o -u 0.794949,-0.552484,-0.250633 -w ibex-sun -t 2019/02:14:23:46:08

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.794949,-0.552484,-0.250633

which is R.A. +325.201 Decl. -14.515

missing R.A. +328.067 Decl. -12.922 (ibex-sun)

error is R.A. +2.866 Decl. +1.593

for a total 3.208 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 0.842234,-0.490861,-0.222927 -w ibex-sun -t 2019/02:15:01:29:16

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.842234,-0.490861,-0.222927

which is R.A. +329.766 Decl. -12.881

missing R.A. +328.135 Decl. -12.896 (ibex-sun)

error is R.A. +1.631 Decl. +0.015

for a total 1.590 deg


ibex_rotate -o -u 0.842234,-0.490861,-0.222927 -w ibex-sun -t 2019/02:15:03:04:22

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.842234,-0.490861,-0.222927

which is R.A. +329.766 Decl. -12.881

missing R.A. +328.199 Decl. -12.873 (ibex-sun)

error is R.A. +1.567 Decl. +0.008

for a total 1.528 deg


ibex_rotate -o -u 0.842234,-0.490861,-0.222927 -w ibex-sun -t 2019/02:19:17:00:15

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.842234,-0.490861,-0.222927

which is R.A. +329.766 Decl. -12.881

missing R.A. +332.523 Decl. -11.287 (ibex-sun)

error is R.A. +2.757 Decl. +1.594

for a total 3.132 deg


The sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 438 apogee:


ibex_rotate -o -r +332.645 -d -11.248 -w ibex-sun -t 2019/02:19:19:58:36

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.871117,-0.450676,-0.195056

which is R.A. +332.645 Decl. -11.248

missing R.A. +332.645 Decl. -11.248 (ibex-sun)

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

for a total 0.000 deg


ibex_rotate -o -r +332.645 -d -11.248 -w ibex-sun -t 2019-02-24T16:58:18.672Z

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.871117,-0.450676,-0.195056

which is R.A. +332.645 Decl. -11.248

missing R.A. +337.412 Decl. -9.452 (ibex-sun)

error is R.A. +4.767 Decl. +1.796

for a total 5.021 deg


No Lo O-mode.


There is no overlap with orbit 436 commands by manual inspection or by checking at


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


Command Approval Checklist is attached.


Ken


> On January 28, 2019 at 3:15 PM "Perry, Timothy" <Timothy.Perry at ngc.com> wrote:
> 
> 
>     All,
> 
>        Attached are the planning files for Orbit #437.
> 
>     Please respond to this thread with comments and approvals.
> 
>     Approvals are required by COB on 31 Jan 2019.
> 
>      
> 
>     Please note the following:
> 
>     1.       No Battery Balancing
> 
>     2.       Perigee Sun Maneuver
> 
>     3.       IBEX_2019_041_o0437a_v001_.ccvr
> 
>         # Input files:         1
> 
>         #   IBEX_2019_041_o0437a_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 2019/02/11 03:38:09 UTC
> 
>         IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                      transition to science mode at 2019/02/15 02:34:22 UTC
> 
>          
> 
>         ==============
> 
>         OTHER MESSAGES
> 
>         ==============
> 
>         NO MESSAGES.
> 
>      
> 
>      
> 
>     Timothy E. Perry
> 
>     CRS IBEX OCO-2
> 
>     Mission Operations
> 
>     tim.perry at orbitalatk.com
> 
>     Office (703) 406-5976
> 
>     Cell (301) 606-1430
> 
>     [cid:image001.jpg at 01D04F4E.6B1BECE0]
> 
>      
> 
>      
> 
> 
> 
>     ---------------------------------------------
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>     *********************
> 


 
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