[Isocops] IBEX Orbit #498 ATS Approval ( 19 - 28 August 2020 ) - v001 approval

Sun Aug 2 09:28:43 EDT 2020

All,

I have looked at the orbit 498 ATS files,

IBEX_2020_232_o0498a_BUS_v001.scr

and

IBEX_2020_232_o0498a_INST_v001.scr,

and I approve.

The only constraint violations in

IBEX_2020_232_o0498a_BUS_v001.ccvr

and

IBEX_2020_232_o0498a_INST_v001.ccvr

are from the removal of the

ACT_SetSpinPulseProtectEnable Enable

commands (2) and a warning due to the eclipse; the violations are expected.

The PL commands in

IBEX_2020_232_o0498a_INST_v001.scr

match those in the v002 STF,

IBEX_2020_232_o0498a_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_232_o0498a_BUS_v001.oef,

and as verified with ibex_orbit.

There are no star tracker outages.

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

IBEX_Orbit498_Contacts.txt,

for all contacts (2).

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

The inertial precession maneuver at perigee of orbit 497 left us pointing in safe directions for the orbit 498 arc A ascending and descending sequences:

ibex_rotate -o -u -0.808309,0.543673,0.225954 -w ibex-sun -t 2020/08:19:09:18:20
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.808309,+0.543673,+0.225954
which is R.A. +146.075 Decl. +13.059
missing R.A. +148.799 Decl. +12.638 (ibex-sun)
error is R.A. +2.724 Decl. +0.421
for a total 2.689 deg

ibex_rotate -o -u -0.808309,0.543673,0.225954 -w ibex-sun -t 2020/08:23:03:59:41
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.808309,+0.543673,+0.225954
which is R.A. +146.075 Decl. +13.059
missing R.A. +152.212 Decl. +11.432 (ibex-sun)
error is R.A. +6.137 Decl. +1.627
for a total 6.213 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 -0.850679,0.486203,0.199881 -w ibex-sun -t 2020/08:23:05:42:49
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.850679,+0.486203,+0.199881
which is R.A. +150.250 Decl. +11.530
missing R.A. +152.279 Decl. +11.409 (ibex-sun)
error is R.A. +2.029 Decl. +0.121
for a total 1.992 deg

ibex_rotate -o -u -0.850679,0.486203,0.199881 -w ibex-sun -t 2020/08:23:07:17:55
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.850679,+0.486203,+0.199881
which is R.A. +150.250 Decl. +11.530
missing R.A. +152.340 Decl. +11.387 (ibex-sun)
error is R.A. +2.090 Decl. +0.143
for a total 2.054 deg

ibex_rotate -o -u -0.850679,0.486203,0.199881 -w ibex-sun -t 2020/08:27:22:17:16
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis. +1.000000,+0.000000,+0.000000
towards ECI. -0.850679,+0.486203,+0.199881
which is R.A. +150.250 Decl. +11.530
missing R.A. +156.695 Decl. +9.743 (ibex-sun)
error is R.A. +6.445 Decl. +1.787
for a total 6.581 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 499 apogee:

ibex_rotate -o -u -0.889274,0.423115,0.173683 -w ibex-sun -t 2020/08:28:03:14:27
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.889274,+0.423115,+0.173683
which is R.A. +154.555 Decl. +10.002
missing R.A. +156.876 Decl. +9.663 (ibex-sun)
error is R.A. +2.321 Decl. +0.339
for a total 2.312 deg

ibex_rotate -o -u -0.889274,0.423115,0.173683 -w ibex-sun -t 2020-09-01T20:35:36.122Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.889274,+0.423115,+0.173683
which is R.A. +154.555 Decl. +10.002
missing R.A. +161.053 Decl.+ 8.026 (ibex-sun)
error is R.A. +6.498 Decl. +1.976
for a total 6.715 deg

Lo background mode for the entire orbit.

There is no overlap with orbit 497 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken

>     On 07/30/2020 1:18 PM Perry, Timothy E [US] (IS) <timothy.perry at ngc.com> wrote:
> 
> 
> 
>     All,
> 
>        Attached are the planning files for Orbit #498
> 
>     Please respond to this thread with comments and approvals.  
> 
>     Approvals are required by COB on 04 August 2020
> 
> 
>     Please note the following:
> 
>        1. I generated 3 separate ATS files BUS, INST and a complete file. The BUS and INST will be the files to be uplinked. The complete ATS, I used as a sanity check to see how the commands lined up. Since we are in a new phase of ATS generation. IF you have any ideas of doing this differently, let me know.
> 
> 
>        1. The 3 ATS files have been changed to word  files and encrypted. I will send out another email with the password. The files that have been transferred via MFT have not been encrypted and are still text files.  
> 
> 
>        1. I moved the 2 House Keeping commands from the INST ATS to the BUS ATS. I commented out the 2 commands in the INST ATS. If for some reason we were unable to uplink the INST Commands for this orbit, we would have been in the wrong spacecraft state for executing the maneuver commands.
> 
> 
>     4.       # Orbit 498 Battery Balancing
> 
>         # 2020-08-28T06:09:00.186Z,Perigee,orbit:498
> 
>           Set Long Eclipse Flag TRUE $TIME=2020/08:28:05:30:00
> 
>           Set Long Eclipse Flag FALSE $TIME=2020/08:28:07:00:00
> 
> 
>     5.       # Orbit# 496 Reset Master Timer
> 
>        Reset on Orbit 496@ 2020/08:09:19:45:00
> 
> 
>     6.       Eclipse – No Actions Required
> 
>         2020-08-22T01:11:55.607Z,PenumbraEntry,orbit:498
> 
>         2020-08-22T01:11:55.607Z,EclipseEntry,moderate:true,long:false,orbit:498
> 
>         2020-08-22T02:33:25.484Z,PenumbraExit,orbit:498
> 
>         2020-08-22T02:33:25.484Z,EclipseExit,moderate:true,long:false,orbit:498
> 
> 
>     7.       Command Load Constraint Violation Report (CCVR)
> 
>     IBEX_2020_232_o0498a_v001.ccvr
> 
>         # Input files:         1
> 
>         #   IBEX_2020_232_o0498a_v001.scr
> 
> 
>         ==========================
> 
>         HARD CONSTRAINT VIOLATIONS
> 
>         ==========================
> 
>         NO VIOLATIONS.
> 
> 
>         ==========================
> 
>         SOFT CONSTRAINT VIOLATIONS
> 
>         ==========================
> 
>         IBX-CLC-015: Battery charge falls below minimum from 2020/08/22 02:01:55 UTC -
> 
>                      2020/08/22 04:15:25 UTC. Lowest charge level is 5660.164000
> 
>                      watt-minutes during this interval.
> 
>         IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                      transition to science mode at 2020/08/19 05:27:23 UTC
> 
>         IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                      transition to science mode at 2020/08/23 06:47:55 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]
> 
> 
> 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.sr.unh.edu/pipermail/isocops/attachments/20200802/62c9d3cc/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.png
Type: image/png
Size: 5047 bytes
Desc: not available
URL: <https://lists.sr.unh.edu/pipermail/isocops/attachments/20200802/62c9d3cc/image001-0001.png>