[Isocops] IBEX ORbit# 321 ATS Approval (23 Mar 16 - 1 Apr 16) - v001 approval

Ken Fairchild fair-play at comcast.net
Sat Mar 12 16:18:06 EST 2016


All, 

Note: Off-pointing at arc B descending is 3.869 deg 
Off-pointing at orbit 322 apogee is 4.957 deg 

I have looked at the orbit 321 recovery ATS, 



IBEX_2016_083_o0321a_Recovery_v001.scr, 




and I approve. 




The only constraint violations in 




IBEX_2016_083_o0321a_Recovery_v001.ccvr 




are because we removed the 




ACT_SetSpinPulseProtectEnable Enable 




commands; the violations are expected. 




The PL commands in the v001 ATS match those in the v003 STF, 




IBEX_2016_083_o0321a_v003.stf. 




Ascending and descending command sequences are consistent with each other and 15 Re ascending, the apogee maneuver time and 15 Re descending as determined from the OEF, 




IBEX_2016_083_o0321a_Recovery_v001.oef, 




and as verified with ibex_orbit. 




There are two star tracker outages. The first starts before 15 Re ascending and ends 1+ days after apogee. The second starts 1 1/2 days after the first outage ends and ends 1+ day later. Some despinning may be required due to this outage. 




There is one moon in Lo FOV session in arc B. The ATS start time is about hour before that in the OEF and the ATS end time is the same as that in the OEF. Differences in the times are not unusual. 




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




IBEX_Orbit321_RecoveryContacts.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 sun precession maneuver at perigee of orbit 320 left us pointing in safe directions for the orbit 321 arc A ascending and descending sequences: 




ibex_rotate -o -r +2.246 -d +0.991 -w ibex-sun -t 2016/03:23:18:35:21 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.999082,+0.039184,+0.017295 

which is R.A. +2.246 Decl. +0.991 

missing R.A. +3.075 Decl. +1.319 (ibex-sun) 

error is R.A. +0.829 Decl. +0.328 

for a total 0.891 deg 




ibex_rotate -o -r +2.246 -d +0.991 -w ibex-sun -t 2016/03:27:17:46:27 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.999082,+0.039184,+0.017295 

which is R.A. +2.246 Decl. +0.991 

missing R.A. +6.775 Decl. +2.895 (ibex-sun) 

error is R.A. +4.529 Decl. +1.904 

for a total 4.910 deg 




The sun 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 -r +6.843 -d +2.924 -w ibex-sun -t 2016/03:27:19:34:35 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.991584,+0.118994,+0.051011 

which is R.A. +6.843 Decl. +2.924 

missing R.A. +6.843 Decl. +2.924 (ibex-sun) 

error is R.A. +0.000 Decl. +0.000 

for a total 0.000 deg 




ibex_rotate -o -r +6.843 -d +2.924 -w ibex-sun -t 2016/03:27:21:04:41 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.991584,+0.118994,+0.051011 

which is R.A. +6.843 Decl. +2.924 

missing R.A. +6.899 Decl. +2.949 (ibex-sun) 

error is R.A. +0.056 Decl. +0.025 

for a total 0.061 deg 




ibex_rotate -o -r +6.843 -d +2.924 -w ibex-sun -t 2016/03:31:20:23:19 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.991584,+0.118994,+0.051011 

which is R.A. +6.843 Decl. +2.924 

missing R.A. +10.390 Decl. +4.488 (ibex-sun) 

error is R.A. +3.547 Decl. +1.564 

for a total 3.869 deg 




The sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 322 apogee: 




ibex_rotate -o -r +10.481 -d +4.526 -w ibex-sun -t 2016/03:31:22:52:17 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.980249,+0.181342,+0.078911 

which is R.A. +10.481 Decl. +4.526 

missing R.A. +10.481 Decl. +4.526 (ibex-sun) 

error is R.A. +0.000 Decl. +0.000 

for a total 0.000 deg 




ibex_rotate -o -r +10.481 -d +4.526 -w ibex-sun -t 2016-04-05T20:29:22.112Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.980249,+0.181342,+0.078911 

which is R.A. +10.481 Decl. +4.526 

missing R.A. +15.089 Decl. +6.406 (ibex-sun) 

error is R.A. +4.608 Decl. +1.880 

for a total 4.957 deg 




No Lo O-mode. 




There is no overlap with orbit 320 commands by manual inspection or by checking at 




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




Command Approval Checklist is attached. 




Ken 



----- Original Message -----

From: "Wesley.Sheral" <sheral.wesley at orbitalatk.com> 
To: "David Heirtzler" <dheirtzl at atlas.sr.unh.edu>, "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>, "Lockwood.Robert" <robert.lockwood at orbitalatk.com>, "Michelle Reno" <mreno at swri.edu>, "Nigel Angold" <nigel.angold at nasa.gov>, "Paul Janzen" <paul.janzen at umontana.edu>, "Perry.Tim" <tim.perry at orbitalatk.com>, "Tyler.Ryan" <ryan.tyler at orbitalatk.com>, "Wesley.Sheral" <sheral.wesley at orbitalatk.com> 
Sent: Thursday, March 10, 2016 5:03:40 PM 
Subject: IBEX ORbit# 321 ATS Approval (23 Mar 16 - 1 Apr 16) 



Guys, 

Here is the ATS and planning files for Orbit# 321 

Please respond to this email thread with your comments and approvals 

Approvals are required before 12 Mar 16 @ 2000 



Note the following: 

1. No ENABLE Spin Pulse commands 

2. Moon in Lo FOV Commands 

2016-03-31T17:55:31.985Z,MoonInLoFovStart,orbit:321 

2016-03-31T18:49:45.476Z,MoonInLoFovStop,orbit:321 

3. Apogee Sun Maneuver 

4. Perigee Sun Maneuver 

5. PERIGEE: Battery Balancing 

2016-04-01T08:01:06.303Z,Perigee,orbit:321 

SetLongEclipseFlag TRUE $TIME=2016/04:01:07:00:00 

SetLongEclipseFlag FALSE $TIME=2016/04:01:08:30:00 

6. Command Load Constraint Violation Report 

IBEX_2016_083_o0321a_Recovery_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 2016/03/23 16:56:47 UTC 

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

transition to science mode at 2016/03/27 20:34:43 UTC 



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

OTHER MESSAGES 

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

NO MESSAGES. 













Sheral R. Wesley 

IBEX Mission OPS 

CRS/CYGNUS Mission Planning 

Bldg. 2 Room 1337 

Office (703) 406-5641 

Cell (202) 236-0802 







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