[Isocops] IBEX Orbit #474 ATS Approval (14 - 23 Jan 2020) - v001 approval

KEN FAIRCHILD fair-play at comcast.net
Mon Jan 6 22:24:23 EST 2020 

All,

Note: Angle at orbit 474 arc B descending after apogee sun precession maneuver:  4.179 deg

I have looked at the orbit 474 ATS,

IBEX_2020_014_o0474a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2020_014_o0474a_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_2020_014_o0474a_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_2020_014_o0474a_v001.oef,

and as verified with ibex_orbit.

There is one star tracker outage.  The outage starts about 2 1/2 days after 15 Re ascending 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_Orbit474_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 473 left us pointing in safe directions for the orbit 474 arc A ascending and descending sequences:

ibex_rotate -o -u 0.414375,-0.830927,-0.371287 -w ibex-sun -t 2020/01:14:17:25:28
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.414375,-0.830927,-0.371287
which is R.A. +296.505 Decl. -21.795
missing R.A. +295.624 Decl. -21.370 (ibex-sun)
error is R.A. +0.881 Decl. +0.425
for a total 0.923 deg

ibex_rotate -o -u 0.414375,-0.830927,-0.371287 -w ibex-sun -t 2020/01:18:20:38:00
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.414375,-0.830927,-0.371287
which is R.A. +296.505 Decl. -21.795
missing R.A. +300.056 Decl. -20.558 (ibex-sun)
error is R.A. +3.551 Decl. +1.237
for a total 3.535 deg

The sun 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 -r +300.135 -d -20.542 -w ibex-sun -t 2020/01:18:22:26:08
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.470117,-0.809854,-0.350894
which is R.A. +300.135 Decl. -20.542
missing R.A. +300.135 Decl. -20.542 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg

ibex_rotate -o -r +300.135 -d -20.542 -w ibex-sun -t 2020/01:18:23:56:14
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.470117,-0.809854,-0.350894
which is R.A. +300.135 Decl. -20.542
missing R.A. +300.200 Decl. -20.528 (ibex-sun)
error is R.A. +0.065 Decl. +0.014
for a total 0.062 deg

ibex_rotate -o -r +300.135 -d -20.542 -w ibex-sun -t 2020/01:23:02:25:00
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.470117,-0.809854,-0.350894
which is R.A. +300.135 Decl. -20.542
missing R.A. +304.482 Decl. -19.645 (ibex-sun)
error is R.A. +4.347 Decl. +0.897
for a total 4.179 deg

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 475 apogee:

ibex_rotate -o -u 0.556953,-0.757923,-0.339641 -w ibex-sun -t 2020/01:23:05:35:12
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.556953,-0.757923,-0.339641
which is R.A. +306.310 Decl. -19.855
missing R.A. +304.627 Decl. -19.620 (ibex-sun)
error is R.A. +1.683 Decl. +0.235
for a total 1.601 deg

ibex_rotate -o -u 0.556953,-0.757923,-0.339641 -w ibex-sun -t 2020-01-28T02:26:56.914Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.556953,-0.757923,-0.339641
which is R.A. +306.310 Decl. -19.855
missing R.A. +309.789 Decl. -18.413 (ibex-sun)
error is R.A. +3.479 Decl. +1.442
for a total 3.589 deg

No Lo O-mode.

There is no overlap with orbit 473 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken


> On December 31, 2019 at 3:53 PM "Perry, Timothy E [US] (IS)" <Timothy.Perry at ngc.com> wrote:
> 
> 
>     All,
> 
>        Attached are the planning files for Orbit #474
> 
>     Please respond to this thread with comments and approvals.  
> 
>     Approvals are required by COB on 03 Jan 2020
> 
>      
> 
>     Please note the following:
> 
>     1.       Battery Balancing
> 
>         # Orbit 474 Battery Balancing
> 
>         # 2020-01-23T12:27:21.585Z,Perigee,orbit:474
> 
>           @ECT_SetLongEclipseFlag TRUE $TIME=2020/01:23:12:00:00
> 
>           @ECT_SetLongEclipseFlag FALSE $TIME=2020/01:23:13:30:00  
> 
>      
> 
>     2.       Apogee Sun maneuver @2020/01:18:22:11:08z
> 
>      
> 
>     3.       Command Load Constraint Violation Report (CCVR)
> 
>         IBEX_2020_014_o0474a_v001_.ccvr
> 
>          
> 
>         ==========================
> 
>         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 2020/01/14 14:51:05 UTC
> 
>         IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                      transition to science mode at 2020/01/18 23:26:14 UTC
> 
>          
> 
>         ==============
> 
>         OTHER MESSAGES
> 
>         ==============
> 
>         NO MESSAGES.
> 
>          
> 
>      
> 
>     Timothy E.Perry
> 
>     CRS IBEX OCO-2
> 
>     Mission Operations
> 
>     timothy.perry at ngc.com
> 
>     Office (703) 406-5976
> 
>     Cell (301) 606-1430
> 
>      
> 
>     [cid:image001.png at 01D542D6.6047A400]
> 
>      
> 
>      
> 


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