[Isocops] IBEX Orbit #574 ATS Approval (10 - 19 July 2022) - v001 approval

[KEN FAIRCHILD]

All,

I have looked at the orbit 574 ATS,

IBEX_2022_191_o0574a_v001.scr,

and I approve.

The only constraint violations in 

IBEX_2022_191_o0574a_v001.ccvr

are from the removal of the

ACT_SetSpinPulseProtectEnable Enable

commands (2); the violations are expected.

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_191_o0574a_v001.oef,

and as verified with ibex_orbit.

There are two star tracker outages.  The first starts 8 hours after orbit 573 perigee and runs for 1+ days.  The second starts 2+ hours after perigee and runs for about 5.5 hours.  Some despinning may be required due to the first outage.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file,

IBEX_Orbit574_Contacts.txt,

for all contacts (3).

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

The inertial precession maneuver at perigee of orbit 573 leaves us pointing in safe directions for the orbit 574 arc A ascending and descending sequences:

ibex_rotate -o -u -0.271668,0.886539,0.374493 -w ibex-sun -t 2022/07:11:01:52:17
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.271668,+0.886539,+0.374493
which is R.A. +107.037 Decl. +21.993
missing R.A. +109.989 Decl. +22.145 (ibex-sun)
error is R.A. +2.952 Decl. +0.152
for a total 2.740 deg

ibex_rotate -o -u -0.271668,0.886539,0.374493 -w ibex-sun -t 2022/07:14:14:23:59
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.271668,+0.886539,+0.374493
which is R.A. +107.037 Decl. +21.993
missing R.A. +113.519 Decl. +21.684 (ibex-sun)
error is R.A. +6.482 Decl. +0.309
for a total 6.024 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 -0.340964,0.866431,0.364747 -w ibex-sun -t 2022/07:14:16:07:07
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.340964,+0.866431,+0.364747
which is R.A. +111.481 Decl. +21.392
missing R.A. +113.593 Decl. +21.674 (ibex-sun)
error is R.A. +2.112 Decl. +0.282
for a total 1.984 deg

ibex_rotate -o -u -0.340964,0.866431,0.364747 -w ibex-sun -t 2022/07:14:17:42:13
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.340964,+0.866431,+0.364747
which is R.A. +111.481 Decl. +21.392
missing R.A. +113.661 Decl. +21.665 (ibex-sun)
error is R.A. +2.180 Decl. +0.273
for a total 2.046 deg

ibex_rotate -o -u -0.340964,0.866431,0.364747 -w ibex-sun -t 2022/07:19:03:37:12
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.340964,+0.866431,+0.364747
which is R.A. +111.481 Decl. +21.392
missing R.A. +118.218 Decl. +20.920 (ibex-sun)
error is R.A. +6.737 Decl. +0.472
for a total 6.301 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 575 apogee:

ibex_rotate -o -u -0.411305,0.839839,0.354258 -w ibex-sun -t 2022/07:19:06:41:28
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.411305,+0.839839,+0.354258
which is R.A. +116.093 Decl. +20.748
missing R.A. +118.343 Decl. +20.893 (ibex-sun)
error is R.A. +2.251 Decl. +0.145
for a total 2.109 deg

ibex_rotate -o -u -0.411305,0.839839,0.354258 -w ibex-sun -t 2022-07-24T03:41:44.636Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.411305,+0.839839,+0.354258
which is R.A. +116.093 Decl. +20.748
missing R.A. +123.095 Decl. +19.974 (ibex-sun)
error is R.A. +7.002 Decl. +0.774
for a total 6.609 deg

Lo Normal mode for the entire orbit.

There is no overlap with orbit 573 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken

>     On 06/28/2022 5:59 PM Perry, Timothy E [US] (SP) <timothy.perry at ngc.com> wrote:
> 
> 
>     All, 
>        Attached are the planning files for Orbit #574. Please respond to this thread with comments and approvals.   
>     Approvals are required by COB, 30 June 2022 
>       
>     Please note the following: 
>        1. No Battery Balancing this orbit
>        2. 
>        3. Command Load Constraint Violation Report (CCVR) 
>     IBEX_2022_191_o0574a_v001.ccvr 
>     #   IBEX_2022_191_o0574a_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 2022/07/10 23:48:56 UTC 
>     IBX-CLC-016: No command to enable spin pulse protection was found after 
>                  transition to science mode at 2022/07/14 17:12:13 UTC 
> 
>     ============== 
>     OTHER MESSAGES 
>     ============== 
>     NO MESSAGES
> 
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