[Isocops] IBEX Orbit #553 ATS Approval (01 Jan 2022 - 10 Jan 2022) - v001 approval

KEN FAIRCHILD fair-play at comcast.net
Mon Dec 20 02:25:02 EST 2021 

All,

I have looked at the orbit 553 ATS,

IBEX_2021_365_o0553a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2021_365_o0553a_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_365_o0553a_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_365_o0553a_v001.oef,

and as verified with ibex_orbit.

There is one star tracker outage.  The outage starts about 4 hours before apogee and runs for 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_Orbit553_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 552 leaves us pointing in safe directions for the orbit 553 arc A ascending and descending sequences:

ibex_rotate -o -u 0.194222,-0.895965,-0.399405 -w ibex-sun -t 2022/01:01:04:48:18
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.194222,-0.895965,-0.399405
which is R.A. +282.231 Decl. -23.541
missing R.A. +281.373 Decl. -23.044 (ibex-sun)
error is R.A. +0.858 Decl. +0.497
for a total 0.932 deg

ibex_rotate -o -u 0.194222,-0.895965,-0.399405 -w ibex-sun -t 2022/01:04:11:41:44
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.194222,-0.895965,-0.399405
which is R.A. +282.231 Decl. -23.541
missing R.A. +285.035 Decl. -22.717 (ibex-sun)
error is R.A. +2.804 Decl. +0.824
for a total 2.707 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 0.272934,-0.87899,-0.391004 -w ibex-sun -t 2022/01:04:13:24:52
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.272934,-0.878990,-0.391004
which is R.A. +287.250 Decl. -23.017
missing R.A. +285.113 Decl. -22.708 (ibex-sun)
error is R.A. +2.137 Decl. +0.309
for a total 1.993 deg

ibex_rotate -o -u 0.272934,-0.87899,-0.391004 -w ibex-sun -t 2022/01:04:14:59:58
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.272934,-0.878990,-0.391004
which is R.A. +287.250 Decl. -23.017
missing R.A. +285.184 Decl. -22.700 (ibex-sun)
error is R.A. +2.066 Decl. +0.317
for a total 1.930 deg

ibex_rotate -o -u 0.272934,-0.87899,-0.391004 -w ibex-sun -t 2022/01:09:15:09:07
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.272934,-0.878990,-0.391004
which is R.A. +287.250 Decl. -23.017
missing R.A. +290.564 Decl. -22.079 (ibex-sun)
error is R.A. +3.314 Decl. +0.938
for a total 3.201 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 554 apogee:

ibex_rotate -o -u 0.351413,-0.85492,-0.381603 -w ibex-sun -t 2022/01:09:19:04:49
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. +290.750 Decl. -22.062 (ibex-sun)
error is R.A. +1.595 Decl. +0.371
for a total 1.522 deg

ibex_rotate -o -u 0.351413,-0.85492,-0.381603 -w ibex-sun -t 2022-01-14T16:30:46.674Z
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. +296.136 Decl. -21.250 (ibex-sun)
error is R.A. +3.791 Decl. +1.183
for a total 3.712 deg

Lo Normal mode for the entire orbit.

There is no overlap with orbit 552 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken

>     On 12/17/2021 6:09 PM Perry, Timothy E [US] (SP) <timothy.perry at ngc.com> wrote:
> 
> 
> 
>     All,
> 
>        Attached are the planning files for Orbit #553. Please respond to this thread with comments and approvals.  
> 
>     Approvals are required by COB, 21 Dec 2021
> 
> 
>     Please note the following:
> 
>        1. No Battery Balancing this orbit
> 
> 
>     2.       Command Load Constraint Violation Report (CCVR)
> 
>     IBEX_2021_365_o0553a_v001.ccvr
> 
>     # Input files:         1
> 
>     #   IBEX_2021_365_o0553a_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 2022/01/01 02:07:02 UTC
> 
>     IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                  transition to science mode at 2022/01/04 14:29:58 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/20211220/8fdb3409/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/20211220/8fdb3409/image001-0001.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: IBEX-Command-Approval-Checklist-Rev16g-o0553_KWF.doc
Type: application/msword
Size: 119808 bytes
Desc: not available
URL: <https://lists.sr.unh.edu/pipermail/isocops/attachments/20211220/8fdb3409/IBEX-Command-Approval-Checklist-Rev16g-o0553_KWF-0001.doc>

More information about the Isocops mailing list