[Isocops] IBEX Orbit# 248 ATS Approval (30 May 14 - 8 Jun 14) - v001 approval

Ken Fairchild fair-play at comcast.net
Mon May 19 02:22:16 EDT 2014





All, 


I have looked at the orbit 248 ATS, 




IBEX_2014_149_o0248a_v001.scr, 




and I approve. 




There are no constraint violations in 






IBEX_2014_149_o0248a_v001.ccvr. 




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






IBEX_2014_149_o0248a_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_2014_149_o0248a_v001.oef, 




and as verified with ibex_orbit. 




The Hi ABAB command sequences and timing look reasonable. 




There is one star tracker outage in arc B. It starts 3 3/4 hours before 15 Re descending and runs for 10+ hours. 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 1 1/2 hours after that in the OEF and the ATS end time is about 3 1/2 hours before that in the OEF. These differences are not unusual. 




The ground station command sequence is correct and the timing and bit rate match those in the contacts file, 






IBEX_Orbit248Contacts.txt, 




for the apogee contact. All other contacts will be blind acquisitions. 




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 247 left us pointing in safe directions for the orbit 248 arc A ascending and descending sequences: 




ibex_rotate -o -u 0.407394,0.841798,0.354128 -w ibex-sun -t 2014/05:30:07:17:04 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.407394,+0.841798,+0.354128 

which is R.A. +64.175 Decl. +20.740 

missing R.A. +66.868 Decl. +21.733 (ibex-sun) 

error is R.A. +2.693 Decl. +0.993 



for a total 2.700 deg 




ibex_rotate -o -u 0.407394,0.841798,0.354128 -w ibex-sun -t 2014/06:03:01:45:20 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.407394,+0.841798,+0.354128 

which is R.A. +64.175 Decl. +20.740 

missing R.A. +70.855 Decl. +22.237 (ibex-sun) 

error is R.A. +6.680 Decl. +1.497 



for a total 6.393 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 0.334706,0.86854,0.365527 -w ibex-sun -t 2014/06:03:03:28:28 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.334706,+0.868540,+0.365527 

which is R.A. +68.925 Decl. +21.440 

missing R.A. +70.930 Decl. +22.246 (ibex-sun) 

error is R.A. +2.005 Decl. +0.806 



for a total 2.028 deg 




ibex_rotate -o -u 0.334706,0.86854,0.365527 -w ibex-sun -t 2014/06:03:05:03:34 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.334706,+0.868540,+0.365527 

which is R.A. +68.925 Decl. +21.440 

missing R.A. +70.998 Decl. +22.254 (ibex-sun) 

error is R.A. +2.073 Decl. +0.814 



for a total 2.090 deg 




ibex_rotate -o -u 0.334706,0.86854,0.365527 -w ibex-sun -t 2014/06:07:18:45:48 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.334706,+0.868540,+0.365527 

which is R.A. +68.925 Decl. +21.440 

missing R.A. +75.613 Decl. +22.786 (ibex-sun) 

error is R.A. +6.688 Decl. +1.346 



for a total 6.340 deg 




The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 249 apogee: 




ibex_rotate -o -u 0.258682,0.890156,0.375108 -w ibex-sun -t 2014/06:08:02:06:42 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.258682,+0.890156,+0.375108 

which is R.A. +73.796 Decl. +22.031 

missing R.A. +75.903 Decl. +22.814 (ibex-sun) 

error is R.A. +2.107 Decl. +0.783 



for a total 2.099 deg 




ibex_rotate -o -u 0.258682,0.890156,0.375108 -w ibex-sun -t 2014-06-12T21:30:19.005Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.258682,+0.890156,+0.375108 

which is R.A. +73.796 Decl. +22.031 

missing R.A. +80.989 Decl. +23.146 (ibex-sun) 

error is R.A. +7.193 Decl. +1.115 



for a total 6.734 deg 




No Lo O-mode. 




There is no overlap with orbit 247 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: "Ibex Mission Operations" <ibexops at gmail.com> 
To: "Harold Kucharek" <Harald.Kucharek at unh.edu>, "IBEX FDG" <ibex at applieddefense.com>, "ISOC at New Hampshire" <isocops at lists.sr.unh.edu>, "Ken Fairchild" <fair-play at comcast.net>, "Michelle Reno" <mreno at swri.edu>, "Nigel Angold" <ngangold at earthlink.net>, "Paul Janzen" <paul.janzen at umontana.edu>, "Robert Lockwood" <Lockwood.Robert at Orbital.com>, "Ryan Tyler" <tyler.ryan at orbital.com>, "Sheral Wesley" <wesley.sheral at orbital.com>, "Tim Perry" <perry.tim at orbital.com> 
Sent: Sunday, May 18, 2014 3:34:23 AM 
Subject: IBEX Orbit# 248 ATS Approval (30 May 14 - 8 Jun 14) 



Guys, 
Here are the planning files and ATS for Orbit# 248. 
Please respond to this email thread with your questions and approvals. 
Approvals are required before 19 May 14 @2200 UTC 

Note the following: 
1. Battery Balancing at Perigee 
ECT_SetLongEclipseFlag TRUE $TIME=2014/06:08:06:00:00 
ECT_SetLongEclipseFlag FALSE $TIME=2014/06:08:07:30:00 
2. Moon in Lo FOV 
2014-06-04T20:41:44.662Z,MoonInLoFovStart,orbit:248 
2014-06-06T01:54:14.827Z,MoonInLoFovStop,orbit:248 



-- 

Sheral R. Wesley 
SPVR., Satellite Operations 
IBEX Mission OPS 
CYGNUS Mission Planning 
(304) 279-6678 
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