[Isocops] IBEX Orbit# 386 ATS Approval (5 Nov 17 - 14 Nov 17) - v001 approval

Ken Fairchild fair-play at comcast.net
Fri Oct 27 00:43:36 EDT 2017


All, 

I have looked at the orbit 386 ATS, 



IBEX_2017_309_o0386a_v001.scr, 




and I approve. 




The only constraint violations in 




IBEX_2017_309_o0386a_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_2017_309_o0386a_v002.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_2017_309_o0386a_v001.oef, 




and as verified with ibex_orbit. 




There is one star tracker outage. It starts near 15 Re descending in orbit 385 and runs for 1+ days. 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 2 hours after that in the OEF and the ATS end time is about 2 1/2 hours before that in the OEF. These differences are not unusual. 




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




IBEX_Orbit386_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 sun precession maneuver at perigee of orbit 385 left us pointing in safe directions for the orbit 386 arc A ascending and descending sequences: 




ibex_rotate -o -r +220.166 -d -15.600 -w ibex-sun -t 2017/11:05:22:21:28 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.736029,-0.621244,-0.268920 

which is R.A. +220.166 Decl. -15.600 

missing R.A. +221.019 Decl. -15.901 (ibex-sun) 

error is R.A. +0.853 Decl. +0.301 

for a total 0.875 deg 




ibex_rotate -o -r +220.166 -d -15.600 -w ibex-sun -t 2017/11:09:14:36:44 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.736029,-0.621244,-0.268920 

which is R.A. +220.166 Decl. -15.600 

missing R.A. +224.576 Decl. -16.951 (ibex-sun) 

error is R.A. +4.410 Decl. +1.351 

for a total 4.444 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: 




ibex_rotate -o -u -0.704904,-0.646605,-0.29157 -w ibex-sun -t 2017/11:09:16:19:52 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.704904,-0.646605,-0.291570 

which is R.A. +222.530 Decl. -16.952 

missing R.A. +224.647 Decl. -16.970 (ibex-sun) 

error is R.A. +2.117 Decl. +0.018 

for a total 2.025 deg 




ibex_rotate -o -u -0.704904,-0.646605,-0.29157 -w ibex-sun -t 2017/11:09:17:54:58 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.704904,-0.646605,-0.291570 

which is R.A. +222.530 Decl. -16.952 

missing R.A. +224.713 Decl. -16.988 (ibex-sun) 

error is R.A. +2.183 Decl. +0.036 

for a total 2.088 deg 




ibex_rotate -o -u -0.704904,-0.646605,-0.29157 -w ibex-sun -t 2017/11:14:05:47:10 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.704904,-0.646605,-0.291570 

which is R.A. +222.530 Decl. -16.952 

missing R.A. +229.380 Decl. -18.189 (ibex-sun) 

error is R.A. +6.850 Decl. +1.237 

for a total 6.646 deg 




The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 387 apogee: 




ibex_rotate -o -u -0.645818,-0.696712,-0.312269 -w ibex-sun -t 2017/11:14:08:15:43 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.645818,-0.696712,-0.312269 

which is R.A. +227.171 Decl. -18.196 

missing R.A. +229.493 Decl. -18.220 (ibex-sun) 

error is R.A. +2.322 Decl. +0.024 

for a total 2.206 deg 




ibex_rotate -o -u -0.645818,-0.696712,-0.312269 -w ibex-sun -t 2017-11-19T07:06:08.000Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.645818,-0.696712,-0.312269 

which is R.A. +227.171 Decl. -18.196 

missing R.A. +234.507 Decl. -19.462 (ibex-sun) 

error is R.A. +7.336 Decl. +1.266 

for a total 7.057 deg 




No Lo O-mode. 




There is no overlap with orbit 385 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: "Sheral Wesley" <Sheral.Wesley at OrbitalATK.com> 
To: "Eric Chubin" <Eric.Chubin at OrbitalATK.com>, "Colin Joyce" <cjl46 at wildcats.unh.edu>, "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" <kwfairchild at gmail.com>, "Ken Fairchild" <fair-play at comcast.net>, "Robert Lockwood" <Robert.Lockwood at OrbitalATK.com>, "Nigel Angold" <nigel.angold at nasa.gov>, "Paul Janzen" <paul.janzen at umontana.edu>, "Timothy Perry" <Timothy.Perry at OrbitalATK.com>, "Ryan Tyler" <Ryan.Tyler at OrbitalATK.com>, "Sheral Wesley" <Sheral.Wesley at OrbitalATK.com> 
Sent: Wednesday, October 25, 2017 11:19:58 AM 
Subject: IBEX Orbit# 386 ATS Approval (5 Nov 17 - 14 Nov 17) 



Guys, 

Here are the planning files and ATS for Orbit# 386. 

Please respond to this email thread with your comments and approvals 

Approvals are required before 26 Oct @1800 UTC 



Note the following: 

1. The OEF is longer than usual because of the PERIGEE sun maneuver in Orbit# 385. 

2. The EPH v002 file was generated because of the PERIGEE sun maneuver in Orbit# 385. 

3. Moon in LO FOV commands 

2017-11-10T15:47:35.221Z,MoonInLoFovStart,orbit:386 

2017-11-11T21:25:20.759Z,MoonInLoFovStop,orbit:386 



4. Battery Balancing Commands 

# 2017-11-14T17:13:49.583Z,Perigee,orbit:386 

SetLongEclipseFlag TRUE $TIME=2017/11:14:16:00:00 

SetLongEclipseFlag FALSE $TIME=2017/11:14:17:30:00 



5. Command Load Constraint Violation Report 

IBEX_2017_309_o0386a_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 2017/11/05 20:37:11 UTC 

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

transition to science mode at 2017/11/09 17:24:58 UTC 



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

OTHER MESSAGES 

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

NO MESSAGES. 





Sheral R. Wesley 

Sr Systems Engineer 

IBEX , OCO2 Mission OPS 

CRS/CYGNUS Mission Planning 

Bldg. 2 Room 1337 

Office (703) 406-5641 

Cell (202) 236-0802 






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Thank you. 
********************* 

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