[Isocops] IBEX Orbit# 391 ATS Approval (21 Dec 17 - 30 Dec 17) - v001 approval

Ken Fairchild fair-play at comcast.net
Sat Dec 9 00:05:46 EST 2017


All, 

Note: Angle at orbit 391 arc B descending sequence after the apogee sun precession maneuver: 4.037 deg 

I have looked at the orbit 391 ATS, 



IBEX_2017_355_o0391a_v001.scr, 




and I approve. 




The only constraint violations in 






IBEX_2017_355_o0391a_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_355_o0391a_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_355_o0391a_v001.oef, 




and as verified with ibex_orbit. 




There is one star tracker outage. The outage starts 2+ days before apogee and runs for 3+ days. Some despinning may be required due to this outage. 




There is one moon in Lo FOV session in arc A. The ATS start time is almost two hours after that in the OEF and the ATS end time is 1 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_Orbit391_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 inertial maneuver at perigee of orbit 390 left us pointing in safe directions for the orbit 391 arc A ascending and descending sequences: 






ibex_rotate -o -u 0.004719,-0.91337,-0.407103 -w ibex-sun -t 2017/12:21:13:18:15 



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



points axis +1.000000,+0.000000,+0.000000 



towards ECI +0.004719,-0.913370,-0.407103 



which is R.A. +270.296 Decl. -24.023 



missing R.A. +269.625 Decl. -23.460 (ibex-sun) 



error is R.A. +0.671 Decl. +0.563 



for a total 0.834 deg 






ibex_rotate -o -u 0.004719,-0.91337,-0.407103 -w ibex-sun -t 2017/12:25:11:12:05 



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



points axis +1.000000,+0.000000,+0.000000 



towards ECI +0.004719,-0.913370,-0.407103 



which is R.A. +270.296 Decl. -24.023 



missing R.A. +273.898 Decl. -23.408 (ibex-sun) 



error is R.A. +3.602 Decl. +0.614 



for a total 3.355 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 +273.980 -d -23.405 -w ibex-sun -t 2017/12:25:13:00:13 



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



points axis +1.000000,+0.000000,+0.000000 



towards ECI +0.063697,-0.915507,-0.397228 



which is R.A. +273.980 Decl. -23.405 



missing R.A. +273.980 Decl. -23.405 (ibex-sun) 



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



for a total 0.001 deg 






ibex_rotate -o -r +273.980 -d -23.405 -w ibex-sun -t 2017/12:25:14:30:19 



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



points axis +1.000000,+0.000000,+0.000000 



towards ECI +0.063697,-0.915507,-0.397228 



which is R.A. +273.980 Decl. -23.405 



missing R.A. +274.049 Decl. -23.403 (ibex-sun) 



error is R.A. +0.069 Decl. +0.002 



for a total 0.063 deg 






ibex_rotate -o -r +273.980 -d -23.405 -w ibex-sun -t 2017/12:29:12:00:51 



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



points axis +1.000000,+0.000000,+0.000000 



towards ECI +0.063697,-0.915507,-0.397228 



which is R.A. +273.980 Decl. -23.405 



missing R.A. +278.369 Decl. -23.189 (ibex-sun) 



error is R.A. +4.389 Decl. +0.216 



for a total 4.037 deg 




The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 392 apogee: 






ibex_rotate -o -u 0.163042,-0.901094,-0.401804 -w ibex-sun -t 2017/12:29:14:14:31 



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



points axis +1.000000,+0.000000,+0.000000 



towards ECI +0.163042,-0.901094,-0.401804 



which is R.A. +280.256 Decl. -23.691 



missing R.A. +278.477 Decl. -23.185 (ibex-sun) 



error is R.A. +1.779 Decl. +0.506 



for a total 1.708 deg 






ibex_rotate -o -u 0.163042,-0.901094,-0.401804 -w ibex-sun -t 2018-01-03T13:39:41.150Z 



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



points axis +1.000000,+0.000000,+0.000000 



towards ECI +0.163042,-0.901094,-0.401804 



which is R.A. +280.256 Decl. -23.691 



missing R.A. +283.982 Decl. -22.833 (ibex-sun) 



error is R.A. +3.726 Decl. +0.858 



for a total 3.529 deg 




No Lo O-mode. 




There is no overlap with orbit 390 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: Thursday, December 7, 2017 3:04:01 AM 
Subject: IBEX Orbit# 391 ATS Approval (21 Dec 17 - 30 Dec 17) 



Guys, 

Here are the planning files and ATS for Orbit# 391. 

Please respond to this email thread with your comments and approvals 

Approvals are required before 9 Dec 17 @1800 UTC 



Note the following: 

1. Battery Balancing at PERIGEE 

# 2017-12-29T23:57:57.250Z,Perigee,orbit:391 

SetLongEclipseFlag TRUE $TIME=2017/12:29:23:00:00 

SetLongEclipseFlag FALSE $TIME=2017/12:30:00:30:00 



2. Moon in Lo FOV Commands 

# 2017-12-23T00:12:38.309Z,MoonInLoFovStart,orbit:391 

# 2017-12-23T18:06:02.283Z,MoonInLoFovStop,orbit:391 



3. Command Load Constraint Violation Report 

IBEX_2017_355_o0391a_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 2017/12/21 11:51:00 UTC 

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

transition to science mode at 2017/12/25 14:00:19 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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