[Isocops] IBEX Orbit #554 ATS Approval (10 Jan 2022 - 19 Jan 2022) - v001 approval

KEN FAIRCHILD fair-play at comcast.net
Wed Dec 29 22:34:32 EST 2021 

All,

I have looked at the orbit 554 ATS,

IBEX_2022_009_o0554a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2022_009_o0554a_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_2022_009_o0554a_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_2022_009_o0554a_v001.oef,

and as verified with ibex_orbit.

There is one star tracker outage.  The outage starts 1- day after apogee and runs for almost 3 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_Orbit554_Contacts.txt,

for all contacts (4).

We are doing battery cell balancing and the balancing commands are correct and offset by enough time from other commands.

The inertial precession maneuver at perigee of orbit 553 leaves us pointing in safe directions for the orbit 554 arc A ascending and descending sequences:

ibex_rotate -o -u 0.351413,-0.85492,-0.381603 -w ibex-sun -t 2022/01:10:08:47:48
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.351413,-0.854920,-0.381603
which is R.A. +292.345 Decl. -22.433
missing R.A. +291.417 Decl. -21.996 (ibex-sun)
error is R.A. +0.928 Decl. +0.437
for a total 0.964 deg

ibex_rotate -o -u 0.351413,-0.85492,-0.381603 -w ibex-sun -t 2022/01:14:04:57:41
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.351413,-0.854920,-0.381603
which is R.A. +292.345 Decl. -22.433
missing R.A. +295.628 Decl. -21.341 (ibex-sun)
error is R.A. +3.283 Decl. +1.092
for a total 3.237 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 0.42789,-0.825589,-0.367849 -w ibex-sun -t 2022/01:14:06:40:49
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.427890,-0.825589,-0.367849
which is R.A. +297.397 Decl. -21.583
missing R.A. +295.704 Decl. -21.327 (ibex-sun)
error is R.A. +1.693 Decl. +0.256
for a total 1.596 deg

ibex_rotate -o -u 0.42789,-0.825589,-0.367849 -w ibex-sun -t 2022/01:14:08:15:55
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.427890,-0.825589,-0.367849
which is R.A. +297.397 Decl. -21.583
missing R.A. +295.774 Decl. -21.315 (ibex-sun)
error is R.A. +1.623 Decl. +0.268
for a total 1.534 deg

ibex_rotate -o -u 0.42789,-0.825589,-0.367849 -w ibex-sun -t 2022/01:19:00:45:06
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.427890,-0.825589,-0.367849
which is R.A. +297.397 Decl. -21.583
missing R.A. +300.683 Decl. -20.435 (ibex-sun)
error is R.A. +3.286 Decl. +1.148
for a total 3.275 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 555 apogee:

ibex_rotate -o -u 0.502019,-0.789441,-0.353214 -w ibex-sun -t 2022/01:19:04:47:05
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.502019,-0.789441,-0.353214
which is R.A. +302.453 Decl. -20.684
missing R.A. +300.869 Decl. -20.406 (ibex-sun)
error is R.A. +1.584 Decl. +0.278
for a total 1.509 deg

ibex_rotate -o -u 0.502019,-0.789441,-0.353214 -w ibex-sun -t 2022-01-23T23:39:20.331Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.502019,-0.789441,-0.353214
which is R.A. +302.453 Decl. -20.684
missing R.A. +306.024 Decl. -19.305 (ibex-sun)
error is R.A. +3.571 Decl. +1.379
for a total 3.628 deg

Lo Normal mode for the entire orbit.

There is no overlap with orbit 553 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken


>     On 12/28/2021 1:22 PM Perry, Timothy E [US] (SP) <timothy.perry at ngc.com> wrote:
> 
> 
> 
>     All,
> 
>        Attached are the planning files for Orbit #554. Please respond to this thread with comments and approvals.  
> 
>     Approvals are required by COB, 30 Dec 2021
> 
> 
>     Please note the following:
> 
>        1. Battery Balancing this orbit
> 
>     Begin 2022/01/19 09:00:00– End 2022/01/19 10:30:00
> 
> 
>     2.       Command Load Constraint Violation Report (CCVR)
> 
>         IBEX_2022_009_o0554a_v001.ccvr
> 
>         # File type:           Command Load Constraint Violation Report (CCVR)
> 
>         # Input files:         1
> 
>         #   IBEX_2022_009_o0554a_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 2022/01/10 05:37:15 UTC
> 
>         IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                      transition to science mode at 2022/01/14 07:45:55 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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