[Isocops] IBEX Orbit #547 ATS Approval (07 – 16 Nov, 2021) - v001 approval

fair-play at comcast.net fair-play at comcast.net
Wed Oct 27 10:56:11 EDT 2021 

All,

I have looked at the orbit 547 ATS,

IBEX_2021_310_o0547a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2021_310_o0547a_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_2021_310_o0547a_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_2021_310_o0547a_v001.oef,

and as verified with ibex_orbit,

There is one star tracker outage.  The outage starts about 1 day 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_Orbit547_Contacts.txt,

for all contacts (3).

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

The inertial precession maneuver at perigee of orbit 546 left us pointing in safe directions for the orbit 547 arc A ascending and descending sequences:

ibex_rotate -o -u -0.743002,-0.610439,-0.274429 -w ibex-sun -t 2021/11:07:10:00:49
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.743002,-0.610439,-0.274429
which is R.A. +219.406 Decl. -15.928
missing R.A. +222.480 Decl. -16.338 (ibex-sun)
error is R.A. +3.074 Decl. +0.410
for a total 2.982 deg

ibex_rotate -o -u -0.743002,-0.610439,-0.274429 -w ibex-sun -t 2021/11:11:00:19:42
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.743002,-0.610439,-0.274429
which is R.A. +219.406 Decl. -15.928
missing R.A. +226.024 Decl. -17.322 (ibex-sun)
error is R.A. +6.618 Decl. +1.394
for a total 6.492 deg

The inertial 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 -0.687,-0.662664,-0.298175 -w ibex-sun -t 2021/11:11:02:02:50
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.687000,-0.662664,-0.298175
which is R.A. +223.967 Decl. -17.348
missing R.A. +226.095 Decl. -17.340 (ibex-sun)
error is R.A. +2.128 Decl. +0.008
for a total 2.031 deg

ibex_rotate -o -u -0.687,-0.662664,-0.298175 -w ibex-sun -t 2021/11:11:03:37:56
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.687000,-0.662664,-0.298175
which is R.A. +223.967 Decl. -17.348
missing R.A. +226.161 Decl. -17.357 (ibex-sun)
error is R.A. +2.194 Decl. +0.009
for a total 2.094 deg

ibex_rotate -o -u -0.687,-0.662664,-0.298175 -w ibex-sun -t 2021/11:15:13:55:44
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.687000,-0.662664,-0.298175
which is R.A. +223.967 Decl. -17.348
missing R.A. +230.719 Decl. -18.533 (ibex-sun)
error is R.A. +6.752 Decl. +1.185
for a total 6.532 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver at at orbit 548 apogee:

ibex_rotate -o -u -0.628645,-0.709905,-0.317553 -w ibex-sun -t 2021/11:15:17:09:05
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.628645,-0.709905,-0.317553
which is R.A. +228.474 Decl. -18.515
missing R.A. +230.865 Decl. -18.575 (ibex-sun)
error is R.A. +2.391 Decl. +0.060
for a total 2.268 deg

ibex_rotate -o -u -0.628645,-0.709905,-0.317553 -w ibex-sun -t 2021-11-20T14:22:29.286Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.628645,-0.709905,-0.317553
which is R.A. +228.474 Decl. -18.515
missing R.A. +235.891 Decl. -19.733 (ibex-sun)
error is R.A. +7.417 Decl. +1.218
for a total 7.112 deg

Lo Normal mode for the entire orbit.

There is no overlap with orbit 546 commands (except for a contact) by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken

>     On 10/26/2021 4:04 PM Perry, Timothy E [US] (SP) <timothy.perry at ngc.com> wrote:
>      
>      
> 
>     All,
> 
>        Attached are the planning files for Orbit #547. Please respond to this thread with comments and approvals.  
> 
>     Approvals are required by COB, 27 Oct 2021
> 
>      
> 
>     Please note the following:
> 
>        1. No Battery Balancing this orbit
> 
>          
> 
>     2.       Command Load Constraint Violation Report (CCVR)
> 
>         IBEX_2021_310_o0547a_v001.ccvr
> 
>         # Input files:         1
> 
>         #   IBEX_2021_310_o0547a_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 2021/11/07 07:33:45 UTC
> 
>         IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                      transition to science mode at 2021/11/11 03:07:56 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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