[Isocops] IBEX Orbit #479 ATS Approval (29 Feb - 9 Mar 2020) - v001 approval

KEN FAIRCHILD fair-play at comcast.net
Wed Feb 19 20:44:53 EST 2020 

All,

Note: Angle at orbit 480 apogee after the perigee sun precession maneuver:  4.843 deg

I have looked at the orbit 479 ATS,

IBEX_2020_060_o0479a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2020_060_o0479a_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_2020_060_o0479a_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_060_o0479a_v001.oef,

and as verified with ibex_orbit.

There is one star tracker outage.  The outage starts 1 day before 15 Re descending 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_Orbit479_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 inertial maneuver at perigee of orbit 478 left us pointing in safe directions for the orbit 479 arc A ascending and descending sequences:

ibex_rotate -o -u 0.945157,-0.295488,-0.139156 -w ibex-sun -t 2020/02:29:14:35:59
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.945157,-0.295488,-0.139156
which is R.A. +342.639 Decl. -7.999
missing R.A. +341.724 Decl. -7.763 (ibex-sun)
error is R.A. +0.915 Decl. +0.236
for a total 0.936 deg

ibex_rotate -o -u 0.945157,-0.295488,-0.139156 -w ibex-sun -t 2020/03:04:07:50:10
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.945157,-0.295488,-0.139156
which is R.A. +342.639 Decl. -7.999
missing R.A. +345.287 Decl. -6.280 (ibex-sun)
error is R.A. +2.648 Decl. +1.719
for a total 3.140 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 0.968514,-0.224614,-0.107375 -w ibex-sun -t 2020/03:04:09:33:18
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.968514,-0.224614,-0.107375
which is R.A. +346.943 Decl. -6.164
missing R.A. +345.353 Decl. -6.251 (ibex-sun)
error is R.A. +1.590 Decl. +0.087
for a total 1.583 deg

ibex_rotate -o -u 0.968514,-0.224614,-0.107375 -w ibex-sun -t 2020/03:04:11:08:24
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.968514,-0.224614,-0.107375
which is R.A. +346.943 Decl. -6.164
missing R.A. +345.414 Decl. -6.225 (ibex-sun)
error is R.A. +1.529 Decl. +0.061
for a total 1.521 deg

ibex_rotate -o -u 0.968514,-0.224614,-0.107375 -w ibex-sun -t 2020/03:09:00:25:07
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.968514,-0.224614,-0.107375
which is R.A. +346.943 Decl. -6.164
missing R.A. +349.504 Decl. -4.499 (ibex-sun)
error is R.A. +2.561 Decl. +1.665
for a total 3.046 deg

The sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 480 apogee:

ibex_rotate -o -r +349.649 -d -4.445 -w ibex-sun -t 2020/03:09:04:08:50
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. +349.649 Decl. -4.445 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg

ibex_rotate -o -r +349.649 -d -4.445 -w ibex-sun -t 2020-03-13T21:19:41.127Z
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. +354.109 Decl. -2.537 (ibex-sun)
error is R.A. +4.460 Decl. +1.908
for a total 4.843 deg

No Lo O-mode.

There is no overlap with orbit 478 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken

> On February 18, 2020 at 12:29 AM "Perry, Timothy E [US] (IS)" <Timothy.Perry at ngc.com> wrote:
> 
> 
>     All,
> 
>        Attached are the planning files for Orbit #479
> 
>     Please respond to this thread with comments and approvals.  
> 
>     Approvals are required by COB on 19 Feb 2020
> 
>      
> 
>     Please note the following:
> 
>     1.       Battery Balancing
> 
>     # Orbit 479 Battery Balancing
> 
>     # 2020-03-09T09:52:18.238Z,Perigee,orbit:479
> 
>       @ECT_SetLongEclipseFlag TRUE $TIME=2020/03:09:09:00:00
> 
>       @ECT_SetLongEclipseFlag FALSE $TIME=2020/03:09:10:30:00
> 
>      
> 
>     2.       Perigee Sun Maneuver @2020/03:09:03:53:50
> 
>      
> 
>     3.       Command Load Constraint Violation Report (CCVR)
> 
>     IBEX_2020_060_o0479a_v001_.ccvr
> 
>     #   IBEX_2020_060_o0479a_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 2020/02/29 11:51:06 UTC
> 
>     IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                  transition to science mode at 2020/03/04 10:38:24 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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