[Isocops] IBEX Orbit #480 ATS Approval ( 9 - 18 Mar 2020) - v001 approval

KEN FAIRCHILD fair-play at comcast.net
Fri Feb 28 21:42:45 EST 2020 

All,

I have looked at the orbit 480 ATS,

IBEX_2020_069_o0480a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2020_069_o0480a_v001.scr

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_069_o0480a_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_069_o0480a_v001.oef,

and as verified with ibex_orbit.

There is one star tracker outage.  The outage starts a day before orbit 479 15 Re descending and runs for 6+ 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_Orbit480_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 sun precession maneuver at perigee of orbit 479 left us pointing in safe directions for the orbit 480 arc A ascending and descending sequences:

ibex_rotate -o -r +349.649 -d -4.445 -w ibex-sun -t 2020/03:09:19:15:38
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.980767,-0.179137,-0.077502
which is R.A. +349.649 Decl. -4.445
missing R.A. +350.263 Decl. -4.215 (ibex-sun)
error is R.A. +0.614 Decl. +0.230
for a total 0.654 deg

ibex_rotate -o -r +349.649 -d -4.445 -w ibex-sun -t 2020/03:14:05:48:50
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.980767,-0.179137,-0.077502
which is R.A. +349.649 Decl. -4.445
missing R.A. +354.427 Decl. -2.394 (ibex-sun)
error is R.A. +4.778 Decl. +2.051
for a total 5.192 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 0.992482,-0.108116,-0.057355 -w ibex-sun -t 2020/03:14:07:31:46
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.992482,-0.108116,-0.057355
which is R.A. +353.783 Decl. -3.288
missing R.A. +354.492 Decl. -2.365 (ibex-sun)
error is R.A. +0.709 Decl. +0.923
for a total 1.163 deg

ibex_rotate -o -u 0.992482,-0.108116,-0.057355 -w ibex-sun -t 2020/03:14:09:07:04
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.992482,-0.108116,-0.057355
which is R.A. +353.783 Decl. -3.288
missing R.A. +354.551 Decl. -2.338 (ibex-sun)
error is R.A. +0.768 Decl. +0.950
for a total 1.221 deg

ibex_rotate -o -u 0.992482,-0.108116,-0.057355 -w ibex-sun -t 2020/03:17:22:17:16
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.992482,-0.108116,-0.057355
which is R.A. +353.783 Decl. -3.288
missing R.A. +357.682 Decl. -0.986 (ibex-sun)
error is R.A. +3.899 Decl. +2.302
for a total 4.525 deg

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 481 apogee:

ibex_rotate -o -u 0.997014,-0.066798,-0.038754 -w ibex-sun -t 2020/03:18:01:30:20
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.997014,-0.066798,-0.038754
which is R.A. +356.167 Decl. -2.221
missing R.A. +357.803 Decl. -0.940 (ibex-sun)
error is R.A. +1.636 Decl. +1.281
for a total 2.078 deg

ibex_rotate -o -u 0.997014,-0.066798,-0.038754 -w ibex-sun -t 2020-03-22T18:56:43.047Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.997014,-0.066798,-0.038754
which is R.A. +356.167 Decl. -2.221
missing R.A. +2.240 Decl. +0.980 (ibex-sun)
error is R.A. +353.927 Decl. +3.201
for a total 6.864 deg

No Lo O-mode.

There is no overlap with orbit 479 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken


> On February 25, 2020 at 11:13 AM "Perry, Timothy E [US] (IS)" <Timothy.Perry at ngc.com> wrote:
> 
> 
>     All,
> 
>        Attached are the planning files for Orbit #480
> 
>     Please respond to this thread with comments and approvals.  
> 
>     Approvals are required by COB on 28 Feb 2020
> 
>      
> 
>     Please note the following:
> 
>     1.       Battery Balancing
> 
>         # Orbit 480 Battery Balancing
> 
>         # 2020-03-18T08:22:28.791Z,Perigee,orbit:480
> 
>           @ECT_SetLongEclipseFlag TRUE $TIME=2020/03:18:08:00:00
> 
>           @ECT_SetLongEclipseFlag FALSE $TIME=2020/03:18:09:30:00
> 
>          
> 
>     2.       Command Load Constraint Violation Report (CCVR)
> 
>         IBEX_2020_069_o0480a_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 2020/03/09 16:26:34 UTC
> 
>         IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                      transition to science mode at 2020/03/14 08:37:04 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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