[Isocops] IBEX Orbit #458 ATS Approval ( 21 - 30 Aug 2019 )

Weaver, Carol Carol.Weaver at unh.edu
Sat Aug 10 17:22:02 EDT 2019


Hi all,

I’ve looked at the orbit 458 ATS (IBEX_2019_233_o0458a_v001.scr) and I approve.

The only constraint violations in IBEX_2019_233_o0458a_v001.ccvr are the removal of the spin pulse protection commands (2); the violations are expected.

The PL commands in the v001 ATS match those in the v002 STF: IBEX_2019_233_o0458a_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_2019_233_o0458a_v001.oef) and as verified with ibex_orbit.

There are no star tracker outages during orbit 458.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file (IBEX_Orbit458_Contacts.txt) for all contacts (3).

There is no battery cell balancing in this orbit.

The inertial precession maneuver at perigee of orbit 457 left us pointing in safe directions for the orbit 458 arc C ascending and descending sequences:

ibex_rotate -o -u -0.822081,0.525925,0.218143 -w ibex-sun -t 2019/08:21:16:16:23

Quaternion    +0.000000,+0.000000,+0.000000,+0.000000

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.822081,+0.525925,+0.218143

 which is     R.A. +147.391 Decl. +12.600

 missing      R.A. +150.213 Decl. +12.129 (ibex-sun)

 error is     R.A.   +2.822 Decl.  +0.471

 for a total  2.796 deg


Quaternion    +0.000000,+0.000000,+0.000000,+0.000000

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.822081,+0.525925,+0.218143

 which is     R.A. +147.391 Decl. +12.600

 missing      R.A. +153.459 Decl. +10.961 (ibex-sun)

 error is     R.A.   +6.068 Decl.  +1.639

 for a total  6.162 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:

Quaternion    +0.000000,+0.000000,+0.000000,+0.000000

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.862471,+0.468284,+0.191974

 which is     R.A. +151.500 Decl. +11.068

 missing      R.A. +153.518 Decl. +10.940 (ibex-sun)

 error is     R.A.   +2.018 Decl.  +0.128

 for a total  1.985 deg


Quaternion    +0.000000,+0.000000,+0.000000,+0.000000

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.862471,+0.468284,+0.191974

 which is     R.A. +151.500 Decl. +11.068

 missing      R.A. +153.588 Decl. +10.915 (ibex-sun)

 error is     R.A.   +2.088 Decl.  +0.153

 for a total  2.055 deg


Quaternion    +0.000000,+0.000000,+0.000000,+0.000000

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.862471,+0.468284,+0.191974

 which is     R.A. +151.500 Decl. +11.068

 missing      R.A. +157.742 Decl.  +9.347 (ibex-sun)

 error is     R.A.   +6.242 Decl.  +1.721

 for a total  6.379 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 459 apogee:

Quaternion    +0.000000,+0.000000,+0.000000,+0.000000

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.898903,+0.405493,+0.165977

 which is     R.A. +155.720 Decl.  +9.554

 missing      R.A. +157.848 Decl.  +9.301 (ibex-sun)

 error is     R.A.   +2.128 Decl.  +0.253

 for a total  2.114 deg


Quaternion    +0.000000,+0.000000,+0.000000,+0.000000

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.898903,+0.405493,+0.165977

 which is     R.A. +155.720 Decl.  +9.554

 missing      R.A. +162.054 Decl.  +7.615 (ibex-sun)

 error is     R.A.   +6.334 Decl.  +1.939

 for a total  6.556 deg


No Lo O-mode

There is no overlap with orbit 456 commands by manual inspection or by checking http://ibex.unh.edu/cgi-bin/ats.cgi

Command Approval Checklist is attached.

Thanks,
Carol

--
Carol Weaver
University of New Hampshire
503.902.8492

From: "Perry, Timothy" <Timothy.Perry at ngc.com>
Date: Friday, 9August 2019 at 12:23
To: "Weaver, Carol" <Carol.Weaver at unh.edu>, "Chubin, Eric" <Eric.Chubin at ngc.com>, "Joyce, Colin" <Colin.Joyce at unh.edu>, "Heirtzler, David" <David.Heirtzler at unh.edu>, "Dreyer, Sean" <Sean.Dreyer at ngc.com>, IBEX-FDG <IBEX.fdg at applieddefense.com>, IBEXOPS <IBEXOPS at gmail.com>, ISOC <isocops at lists.sr.unh.edu>, Ken Fairchild <fair-play at comcast.net>, "Ken Fairchild (kwfairchild at gmail.com)" <kwfairchild at gmail.com>, Nigel Angold <nigel.angold at nasa.gov>, Nigel Angold <angoldconsulting at earthlink.net>, Paul Janzen <paul.janzen at umontana.edu>, "Perry, Timothy" <Timothy.Perry at ngc.com>, "Tyler, Ryan" <Ryan.Tyler at ngc.com>, "Wesley, Sheral" <Sheral.Wesley at ngc.com>
Subject: IBEX Orbit #458 ATS Approval ( 21 - 30 Aug 2019 )

Caution - External Email
________________________________
All,
   Attached are the planning files for Orbit #458
Please respond to this thread with comments and approvals.
Approvals are required by 1700 on 11 Aug 2019.

Please note the following:

  1.  Note: I updated my Command Approval Form to Rev F. In the form in the Contact Commands section. The check for setting the Read and Write pointers during an APL pass was still at 6500 vs 70000.



  1.  No Battery Balancing


  1.   Command Load Constraint Violation Report (CCVR)

==========================

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 2019/08/21 14:15:09 UTC

IBX-CLC-016: No command to enable spin pulse protection was found after

             transition to science mode at 2019/08/25 09:17:06 UTC



==============

OTHER MESSAGES

==============

NO MESSAGES.





Timothy E.Perry
CRS IBEX OCO-2
Mission Operations
tim.perry at ngc.com
Office (703) 406-5976
Cell (301) 606-1430

[cid:image001.png at 01D54FA0.1F5985E0]



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