[Isocops] IBEX Orbit #468 ATS Approval ( 19 - 28 Nov 2019 ) - v001 approval

Fri Nov 8 10:40:08 EST 2019

All,

Note: Angle at orbit 468 arc B descending after the apogee sun precession maneuver:  4.239 deg

I have looked at the orbit 468 ATS,

IBEX_2019_323_o0468a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2019_323_o0468a_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_323_o0468a_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_323_o0468a_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.

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

IBEX_Orbit468_Contacts.txt,

for all contacts (4).

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 467 left us pointing in safe directions for the orbit 468 arc A ascending and descending sequences:

ibex_rotate -o -u -0.584749,-0.74066,-0.330893 -w ibex-sun -t 2019/11:20:01:00:07
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.584749,-0.740660,-0.330893
which is R.A. +231.709 Decl. -19.323
missing R.A. +234.868 Decl. -19.542 (ibex-sun)
error is R.A. +3.159 Decl. +0.219
for a total 2.987 deg

ibex_rotate -o -u -0.584749,-0.74066,-0.330893 -w ibex-sun -t 2019/11:24:03:28:55
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.584749,-0.740660,-0.330893
which is R.A. +231.709 Decl. -19.323
missing R.A. +239.072 Decl. -20.394 (ibex-sun)
error is R.A. +7.363 Decl. +1.071
for a total 7.007 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 +239.150 -d -20.408 -w ibex-sun -t 2019/11:24:05:17:03
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.480606,-0.804627,-0.348703
which is R.A. +239.150 Decl. -20.408
missing R.A. +239.150 Decl. -20.408 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg

ibex_rotate -o -r +239.150 -d -20.408 -w ibex-sun -t 2019/11:24:06:47:09
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.480606,-0.804627,-0.348703
which is R.A. +239.150 Decl. -20.408
missing R.A. +239.216 Decl. -20.420 (ibex-sun)
error is R.A. +0.066 Decl. +0.012
for a total 0.063 deg

ibex_rotate -o -r +239.150 -d -20.408 -w ibex-sun -t 2019/11:28:08:19:27
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.480606,-0.804627,-0.348703
which is R.A. +239.150 Decl. -20.408
missing R.A. +243.605 Decl. -21.202 (ibex-sun)
error is R.A. +4.455 Decl. +0.794
for a total 4.239 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 469 apogee:

ibex_rotate -o -u -0.447194,-0.81702,-0.363999 -w ibex-sun -t 2019/11:28:11:35:55
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.447194,-0.817020,-0.363999
which is R.A. +241.306 Decl. -21.346
missing R.A. +243.759 Decl. -21.234 (ibex-sun)
error is R.A. +2.453 Decl. +0.112
for a total 2.289 deg

ibex_rotate -o -u -0.447194,-0.81702,-0.363999 -w ibex-sun -t 2019-12-03T08:51:31.117Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.447194,-0.817020,-0.363999
which is R.A. +241.306 Decl. -21.346
missing R.A. +248.956 Decl. -22.023 (ibex-sun)
error is R.A. +7.650 Decl. +0.677
for a total 7.140 deg

No Lo O-mode.

There is no overlap with orbit 467 commands by manual inspection or by checking at:

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

Command Approval Checklist is attached.

Ken

> On November 5, 2019 at 4:35 PM "Perry, Timothy E [US] (IS)" <Timothy.Perry at ngc.com> wrote:
> 
> 
>     All,
> 
>        Attached are the planning files for Orbit #468
> 
>     Please respond to this thread with comments and approvals.  
> 
>     Approvals are required by COB on 09 Nov 2019
> 
>      
> 
>     Please note the following:
> 
>     1.       Orbit 468 Battery Balancing 
> 
>     2019-11-28T18:16:07.064Z,Perigee,orbit:468
> 
>       @ECT_SetLongEclipseFlag TRUE $TIME=2019/11:28:18:00:00
> 
>       @ECT_SetLongEclipseFlag FALSE $TIME=2019/11:28:19:30:00
> 
>      
> 
>     2.       Apogee Sun Maneuver
> 
>      
> 
>     3.       Command Load Constraint Violation Report (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 2019/11/19 22:24:57 UTC
> 
>         IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                      transition to science mode at 2019/11/24 06:17:09 UTC
> 
>          
> 
>         ==============
> 
>         OTHER MESSAGES
> 
>         ==============
> 
>         NO MESSAGE
> 
>      
> 
>      
> 
>     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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