[Isocops] IBEX Orbit # 244 ATS (22 Apr 14 - 1 May 14) - v002 approval

Ken Fairchild fair-play at comcast.net
Fri Apr 11 09:12:35 EDT 2014


All, 


I have looked at the orbit 244 ATS, 




IBEX_2014_112_o0244a_v002.scr, 




and I approve. 




There are no constraint violations in 






IBEX_2014_112_o0244a_v001.ccvr. 




The PL commands in the v002 ATS match those in the v003 STF, 






IBEX_2014_112_o0244a_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_112_o0244a_v001.oef, 




and as verified with ibex_orbit. 




The Hi ABAB command sequences and timing look reasonable. 




There is one star tracker outage. It starts 3+ days after apogee and ends 1+ days later (just before the 15 Re crossing time). Some despinning may be required due to this outage. 




There are no moon in Lo FOV sessions. 




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






IBEX_Orbit244Contacts.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 243 left us pointing in safe directions for the orbit 244 arc A ascending and descending sequences: 




ibex_rotate -o -u 0.865624,0.463229,0.190038 -w ibex-sun -t 2014/04:23:05:23:10 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.865624,+0.463229,+0.190038 

which is R.A. +28.153 Decl. +10.955 

missing R.A. +30.589 Decl. +12.437 (ibex-sun) 

error is R.A. +2.436 Decl. +1.482 



for a total 2.808 deg 




ibex_rotate -o -u 0.865624,0.463229,0.190038 -w ibex-sun -t 2014/04:26:20:05:47 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.865624,+0.463229,+0.190038 

which is R.A. +28.153 Decl. +10.955 

missing R.A. +34.104 Decl. +13.626 (ibex-sun) 

error is R.A. +5.951 Decl. +2.671 



for a total 6.398 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 0.823878,0.523939,0.216133 -w ibex-sun -t 2014/04:26:21:48:55 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.823878,+0.523939,+0.216133 

which is R.A. +32.454 Decl. +12.482 

missing R.A. +34.172 Decl. +13.649 (ibex-sun) 

error is R.A. +1.718 Decl. +1.167 



for a total 2.040 deg 




ibex_rotate -o -u 0.823878,0.523939,0.216133 -w ibex-sun -t 2014/04:26:23:24:01 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.823878,+0.523939,+0.216133 

which is R.A. +32.454 Decl. +12.482 

missing R.A. +34.234 Decl. +13.671 (ibex-sun) 

error is R.A. +1.780 Decl. +1.189 



for a total 2.102 deg 




ibex_rotate -o -u 0.823878,0.523939,0.216133 -w ibex-sun -t 2014/05:01:11:06:35 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.823878,+0.523939,+0.216133 

which is R.A. +32.454 Decl. +12.482 

missing R.A. +38.369 Decl. +15.070 (ibex-sun) 

error is R.A. +5.915 Decl. +2.588 



for a total 6.300 deg 




The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 245 apogee: 




ibex_rotate -o -u 0.776973,0.581462,0.241278 -w ibex-sun -t 2014/05:01:13:31:52 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.776973,+0.581462,+0.241278 

which is R.A. +36.810 Decl. +13.962 

missing R.A. +38.460 Decl. +15.099 (ibex-sun) 

error is R.A. +1.650 Decl. +1.137 



for a total 1.961 deg 




ibex_rotate -o -u 0.776973,0.581462,0.241278 -w ibex-sun -t 2014-05-06T15:35:34.280Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.776973,+0.581462,+0.241278 

which is R.A. +36.810 Decl. +13.962 

missing R.A. +43.490 Decl. +16.579 (ibex-sun) 

error is R.A. +6.680 Decl. +2.617 



for a total 6.955 deg 




No Lo O-mode. 




There is no overlap with orbit 243 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: Wednesday, April 9, 2014 1:45:47 PM 
Subject: IBEX Orbit # 244 ATS (22 Apr 14 - 1 May 14) 


Guys, 
Here are the planning files and ATS for Orbit# 244 
Please respond to this email thread with your comments and approvals 
Approvals are required before 11 Apr 14 @1800 UTC 

Note the following: 
1. Special Ops/Post-LUT Changes 
Hi negative collimator voltage set to 1400 
Hi ABAB (CEM comparison) 

2.IBEX_Hi Gain Test 29 Mar 14 @0700-1114 UTC 

3. Command Load Constraint Violation Report (CCVR) 
# IBEX_2014_112_o0244a_v001.scr 
========================== 
HARD CONSTRAINT VIOLATIONS 
========================== 
NO VIOLATIONS. 
========================== 
SOFT CONSTRAINT VIOLATIONS 
========================== 
NO VIOLATIONS. 
============== 
OTHER MESSAGES 
============== 
NO MESSAGES. 



-- 

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