[Isocops] IBEX Orbit #472 ATS Approval (27 Dec 19 - 5 Jan 20) - v001 approval

KEN FAIRCHILD fair-play at comcast.net
Tue Dec 17 00:34:30 EST 2019 

All,

Note: Angle at orbit 472 arc B descending after apogee sun precession maneuver: 4.289 deg

I have looked at the orbit 472 ATS,

IBEX_2019_360_o0472a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2019_360_o0472a_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_360_o0472a_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 form the OEF,

IBEX_2019_360_o0472a_v001.oef,

and as verified with ibex_orbit.

There is one star tracker outage.  The outage starts 2+ days after 15 Re ascending and runs for 3 1/2+ 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_Orbit472_Contacts.txt,

for all contacts (3).

We are not doing battery cell balancing this orbit - there is an eclipse near perigee.

The inertial maneuver at perigee of orbit 471 left us pointing in safe directions for the orbit 472 arc A ascending and descending sequences:

ibex_rotate -o -u 0.09429,-0.909322,-0.405269 -w ibex-sun -t 2019/12:27:00:44:00
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.094290,-0.909322,-0.405269
which is R.A. +275.920 Decl. -23.908
missing R.A. +275.125 Decl. -23.374 (ibex-sun)
error is R.A. +0.795 Decl. +0.534
for a total 0.903 deg

ibex_rotate -o -u 0.09429,-0.909322,-0.405269 -w ibex-sun -t 2019/12:31:04:06:03
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.094290,-0.909322,-0.405269
which is R.A. +275.920 Decl. -23.908
missing R.A. +279.675 Decl. -23.133 (ibex-sun)
error is R.A. +3.755 Decl. +0.775
for a total 3.529 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 +279.756 -d -23.126 -w ibex-sun -t 2019/12:31:05:54:11
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.155836,-0.906344,-0.392754
which is R.A. +279.756 Decl. -23.126
missing R.A. +279.756 Decl. -23.126 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg

ibex_rotate -o -r +279.756 -d -23.126 -w ibex-sun -t 2019/12:31:07:24:17
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.155836,-0.906344,-0.392754
which is R.A. +279.756 Decl. -23.126
missing R.A. +279.824 Decl. -23.121 (ibex-sun)
error is R.A. +0.068 Decl. +0.005
for a total 0.063 deg

ibex_rotate -o -r +279.756 -d -23.126 -w ibex-sun -t 2020/01:04:11:21:53
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.155836,-0.906344,-0.392754
which is R.A. +279.756 Decl. -23.126
missing R.A. +284.397 Decl. -22.759 (ibex-sun)
error is R.A. +4.641 Decl. +0.367
for a total 4.289 deg

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 473 apogee:

ibex_rotate -o -u 0.25639,-0.88273,-0.393765 -w ibex-sun -t 2020/01:04:14:44:07
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.256390,-0.882730,-0.393765
which is R.A. +286.196 Decl. -23.189
missing R.A. +284.561 Decl. -22.751 (ibex-sun)
error is R.A. +1.635 Decl. +0.438
for a total 1.568 deg

ibex_rotate -o -u 0.25639,-0.88273,-0.393765 -w ibex-sun -t 2020-01-09T14:24:00.384Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.256390,-0.882730,-0.393765
which is R.A. +286.196 Decl. -23.189
missing R.A. +290.053 Decl. -22.149 (ibex-sun)
error is R.A. +3.857 Decl. +1.040
for a total 3.708 deg

No Lo O-mode.

There is no overlap with orbit 471 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken


> On December 13, 2019 at 2:55 PM "Perry, Timothy E [US] (IS)" <Timothy.Perry at ngc.com> wrote:
> 
> 
>     All,
> 
>        Attached are the planning files for Orbit #472
> 
>     Please respond to this thread with comments and approvals.  
> 
>     Approvals are required by COB on 16 Dec 2019
> 
>      
> 
>     Please note the following:
> 
>     1.       No Battery Balancing – Since there is a small eclipse at perigee and it’s only penumbra. Ryan said we did need commands for this eclipse. So, I decided to skip the battery balancing commands for this orbit. I will resume the battery balancing next orbit.
> 
>      
> 
>     2.       Apogee Sun maneuver @ 2019-12-31 05:39:11
> 
>      
> 
>     3.       Perigee Solar Eclipse
> 
>         2020-01-04T20:38:39.088Z,PenumbraEntry,orbit:472
> 
>         2020-01-04T20:38:39.088Z,EclipseEntry,moderate:false,long:false,orbit:472
> 
>         2020-01-04T21:00:19.234Z,Perigee,orbit:472
> 
>         2020-01-04T21:09:14.645Z,PenumbraExit,orbit:472
> 
>         2020-01-04T21:09:14.645Z,EclipseExit,moderate:false,long:false,orbit:472
> 
>          
> 
>     4.       Command Load Constraint Violation Report (CCVR)
> 
>         IBEX_2019_360_o0472a_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 2019/12/26 22:18:50 UTC
> 
>         IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                      transition to science mode at 2019/12/31 06:54:17 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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