[Isocops] IBEX Orbit #467 ATS Approval ( 10 - 19 Nov 2019 ) - v001 approval

Wed Oct 30 22:57:16 EDT 2019

All,

Note: Angle at orbit 467 arc B descending after the apogee sun precession maneuver:  4.325 deg

I have looked at the orbit 467 ATS,

IBEX_2019_314_o0467a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2019_314_o0467a_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_314_o0467a_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_314_o0467a_v001.oef,

and as verified with ibex_orbit.

There is one star tracker outage.  The outage starts at perigee of orbit 466 and runs for 1 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_Orbit467_Contacts.txt,

for all contacts (2).

We are not doing battery cell balancing this orbit; we'll do it again in the next orbit.

The inertial maneuver at perigee of orbit 466 left us pointing in safe directions for the orbit 467 arc A ascending and descending sequences:

ibex_rotate -o -u -0.70876,-0.643612,-0.288831 -w ibex-sun -t 2019/11:10:17:22:09
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.708760,-0.643612,-0.288831
which is R.A. +222.242 Decl. -16.788
missing R.A. +225.310 Decl. -17.148 (ibex-sun)
error is R.A. +3.068 Decl. +0.360
for a total 2.957 deg

ibex_rotate -o -u -0.70876,-0.643612,-0.288831 -w ibex-sun -t 2019/11:14:22:37:03
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.708760,-0.643612,-0.288831
which is R.A. +222.242 Decl. -16.788
missing R.A. +229.487 Decl. -18.237 (ibex-sun)
error is R.A. +7.245 Decl. +1.449
for a total 7.059 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 +229.563 -d -18.255 -w ibex-sun -t 2019/11:15:00:25:11
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.615968,-0.722814,-0.313247
which is R.A. +229.563 Decl. -18.255
missing R.A. +229.563 Decl. -18.255 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg

ibex_rotate -o -r +229.563 -d -18.255 -w ibex-sun -t 2019/11:15:01:55:17
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.615968,-0.722814,-0.313247
which is R.A. +229.563 Decl. -18.255
missing R.A. +229.627 Decl. -18.270 (ibex-sun)
error is R.A. +0.064 Decl. +0.015
for a total 0.062 deg

ibex_rotate -o -r +229.563 -d -18.255 -w ibex-sun -t 2019/11:19:05:28:18
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.615968,-0.722814,-0.313247
which is R.A. +229.563 Decl. -18.255
missing R.A. +233.994 Decl. -19.306 (ibex-sun)
error is R.A. +4.431 Decl. +1.051
for a total 4.325 deg

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 468 apogee:

ibex_rotate -o -u -0.584749,-0.74066,-0.330893 -w ibex-sun -t 2019/11:19:08:48:13
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. +234.147 Decl. -19.347 (ibex-sun)
error is R.A. +2.438 Decl. +0.024
for a total 2.301 deg

ibex_rotate -o -u -0.584749,-0.74066,-0.330893 -w ibex-sun -t 2019-11-24T05:00:11.247Z
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. +239.138 Decl. -20.406 (ibex-sun)
error is R.A. +7.429 Decl. +1.083
for a total 7.070 deg

No Lo O-mode.

There is no overlap with orbit 466 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken

> On October 28, 2019 at 3:42 PM "Perry, Timothy E [US] (IS)" <Timothy.Perry at ngc.com> wrote:
> 
> 
>     All,
> 
>        Attached are the planning files for Orbit #467
> 
>     Please respond to this thread with comments and approvals.  
> 
>     Approvals are required by COB on 30 Oct 2019
> 
>      
> 
>     Please note the following:
> 
>     1.       No Battery balancing
> 
>      
> 
>     2.       The second Perigee pass will be in the Orbit #468 ATS
> 
>     IBEX,AUWA01,ADD,11/19/19,323,22:30:00,11/19/19,323,23:30:00,,LAHO 160K IBEX-2 Orbit# 467 SSR_Dump/Tracking Contact
> 
>      
> 
>     3.       Command Load Constraint Violation Report (CCVR)
> 
>         IBEX_2019_314_o0467a_v001.ccvr
> 
>         # Input files:         1
> 
>         #   IBEX_2019_314_o0467a_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 2019/11/10 14:27:18 UTC
> 
>         IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                      transition to science mode at 2019/11/15 01:25:17 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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