[Isocops] IBEX ORbit# 357 ATS Approval (15 Feb 17 - 24 Feb 17) - v003 approval

Ken Fairchild fair-play at comcast.net
Sat Feb 4 10:01:13 EST 2017


All, 

I have looked at the orbit 357 ATS, 



IBEX_2017_046_o0357a_v003.scr , 




and I approve. 




The only constraint violations in 




IBEX_2017_046_o0357a_v001.ccvr 




are because we removed the 




ACT_SetSpinPulseProtectEnable Enable 




commands (2); the violations are expected. 




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




IBEX_2017_046_o0357a_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_2017_046_o0357a_v001.oef, 




and as verified with ibex_orbit. 




There is one star tracker outage. The outage starts about 15 1/2 hours after apogee and runs for almost 3 days. Some despinning may be required due to this outage. 




There is a moon in Lo FOV session in arc B. The ATS start time is 2 1/2 hours after that in the OEF and the ATS end time is about an hour 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_Orbit357_Contacts.txt, 




for all contacts (3). 




No battery cell balancing this orbit; we'll do it again in the next orbit. 




The inertial maneuver at perigee of orbit 356 left us pointing in safe directions for the orbit 357 arc A ascending and descending sequences: 




ibex_rotate -o -u 0.838433,-0.453812,-0.301804 -w ibex-sun -t 2017/02:15:19:23:02 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.838433,-0.453812,-0.301804 

which is R.A. +331.575 Decl. -17.566 

missing R.A. +329.309 Decl. -12.496 (ibex-sun) 

error is R.A. +2.266 Decl. +5.070 

for a total 5.522 deg 




ibex_rotate -o -u 0.838433,-0.453812,-0.301804 -w ibex-sun -t 2017/02:19:10:25:07 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.838433,-0.453812,-0.301804 

which is R.A. +331.575 Decl. -17.566 

missing R.A. +332.864 Decl. -11.217 (ibex-sun) 

error is R.A. +1.289 Decl. +6.349 

for a total 6.471 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 0.845686,-0.485839,-0.220851 -w ibex-sun -t 2017/02:19:12:08:15 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.845686,-0.485839,-0.220851 

which is R.A. +330.123 Decl. -12.759 

missing R.A. +332.932 Decl. -11.191 (ibex-sun) 

error is R.A. +2.809 Decl. +1.568 

for a total 3.164 deg 




ibex_rotate -o -u 0.845686,-0.485839,-0.220851 -w ibex-sun -t 2017/02:19:13:43:21 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.845686,-0.485839,-0.220851 

which is R.A. +330.123 Decl. -12.759 

missing R.A. +332.995 Decl. -11.167 (ibex-sun) 

error is R.A. +2.872 Decl. +1.592 

for a total 3.229 deg 




ibex_rotate -o -u 0.845686,-0.485839,-0.220851 -w ibex-sun -t 2017/02:24:00:02:26 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.845686,-0.485839,-0.220851 

which is R.A. +330.123 Decl. -12.759 

missing R.A. +337.117 Decl. -9.546 (ibex-sun) 

error is R.A. +6.994 Decl. +3.213 

for a total 7.576 deg 




The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 358 apogee: 




ibex_rotate -o -u 0.920309,-0.354749,-0.164875 -w ibex-sun -t 2017/02:24:02:13:41 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.920309,-0.354749,-0.164875 

which is R.A. +338.920 Decl. -9.490 

missing R.A. +337.204 Decl. -9.514 (ibex-sun) 

error is R.A. +1.716 Decl. +0.024 

for a total 1.693 deg 




ibex_rotate -o -u 0.920309,-0.354749,-0.164875 -w ibex-sun -t 2017-02-28T23:46:27.203Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.920309,-0.354749,-0.164875 

which is R.A. +338.920 Decl. -9.490 

missing R.A. +341.940 Decl. -7.681 (ibex-sun) 

error is R.A. +3.020 Decl. +1.809 

for a total 3.492 deg 




Lo O-mode in arc A (plan 6, 7, 1, 1). O-mode timing matches that specified in the ISN season memo. There is more than 1 hour between the end of the ascending sequence and the start of O-mode and also more than an hour after O-mode ends and the start of the descending sequence. 




There is no overlap with orbit 356 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: "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>, "Ken Fairchild" <kwfairchild at gmail.com>, "Robert Lockwood" <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>, "Timothy Perry" <Timothy.Perry at OrbitalATK.com>, "Ryan Tyler" <Ryan.Tyler at OrbitalATK.com>, "Sheral Wesley" <Sheral.Wesley at OrbitalATK.com> 
Sent: Wednesday, February 1, 2017 5:57:35 PM 
Subject: IBEX ORbit# 357 ATS Approval (15 Feb 17 - 24 Feb 17) 



Guys, 

Here are the planning files and ATS for Orbit# 357. 

Please respond to this email thread with your comments and approvals. 

Approvals are required before 4 Feb 17 @1800 UTC 



Note the following: 

1. IBEX_Lo O-mode (cross calibration) 

2. Moon in LO FOV Commands 

2017-02-21T12:44:17.095Z,MoonInLoFovStart,orbit:357 

2017-02-22T07:06:08.366Z,MoonInLoFovStop,orbit:357 



3. Command Load Constraint Violation Report 

IBEX_2017_046_o0357a_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 2017/02/15 17:45:56 UTC 

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

transition to science mode at 2017/02/19 13:13:21 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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Thank you. 
********************* 

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