[Isocops] IBEX Orbit# 255 ATS Approval (2 Aug 14 - 11 Aug 14) - v001 approval

Ken Fairchild fair-play at comcast.net
Wed Jul 23 09:16:54 EDT 2014



All, 


I have looked at the orbit 255 ATS, 




IBEX_2014_214_o0255a_v001.scr, 




and I approve. 




There are no constraint violations in 






IBEX_2014_214_o0255a_v001.ccvr. 




The PL commands in the v001 ATS match those in the v002 STF, 






IBEX_2014_214_o0255a_v002.stf, 




except that the ATS has an SSR_DUMP_NEW command. This is expected as APL is being used for the dump pass. 




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_214_o0255a_v001.oef, 




and as verified with ibex_orbit. 




There is one star tracker outage. It starts about 7 hours before 15 Re descending and ends about four hours after perigee (delaying the perigee maneuver). 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 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_Orbit255Contacts.txt, 




for all contacts. 




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




The inertial maneuver at perigee of orbit 254 left us pointing in safe directions for the orbit 255 arc A ascending and descending sequences: 




ibex_rotate -o -u -0.608546,0.731931,0.306509 -w ibex-sun -t 2014/08:02:18:50:01 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.608546,+0.731931,+0.306509 

which is R.A. +129.741 Decl. +17.849 

missing R.A. +132.610 Decl. +17.689 (ibex-sun) 

error is R.A. +2.869 Decl. +0.160 



for a total 2.737 deg 




ibex_rotate -o -u -0.608546,0.731931,0.306509 -w ibex-sun -t 2014/08:06:07:14:22 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.608546,+0.731931,+0.306509 

which is R.A. +129.741 Decl. +17.849 

missing R.A. +136.020 Decl. +16.719 (ibex-sun) 

error is R.A. +6.279 Decl. +1.130 



for a total 6.100 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 -0.665142,0.689063,0.287712 -w ibex-sun -t 2014/08:06:08:57:30 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.665142,+0.689063,+0.287712 

which is R.A. +133.988 Decl. +16.721 

missing R.A. +136.090 Decl. +16.699 (ibex-sun) 

error is R.A. +2.102 Decl. +0.022 



for a total 2.013 deg 




ibex_rotate -o -u -0.665142,0.689063,0.287712 -w ibex-sun -t 2014/08:06:10:32:36 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.665142,+0.689063,+0.287712 

which is R.A. +133.988 Decl. +16.721 

missing R.A. +136.154 Decl. +16.680 (ibex-sun) 

error is R.A. +2.166 Decl. +0.041 



for a total 2.075 deg 




ibex_rotate -o -u -0.665142,0.689063,0.287712 -w ibex-sun -t 2014/08:10:18:12:43 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.665142,+0.689063,+0.287712 

which is R.A. +133.988 Decl. +16.721 

missing R.A. +140.322 Decl. +15.479 (ibex-sun) 

error is R.A. +6.334 Decl. +1.242 



for a total 6.211 deg 




The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 256 apogee: 




ibex_rotate -o -u -0.72006,0.640536,0.266885 -w ibex-sun -t 2014/08:11:12:32:38 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.720060,+0.640536,+0.266885 

which is R.A. +138.345 Decl. +15.479 

missing R.A. +140.981 Decl. +15.265 (ibex-sun) 

error is R.A. +2.636 Decl. +0.214 



for a total 2.551 deg 




ibex_rotate -o -u -0.72006,0.640536,0.266885 -w ibex-sun -t 2014-08-15T17:00:41.780Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.720060,+0.640536,+0.266885 

which is R.A. +138.345 Decl. +15.479 

missing R.A. +144.920 Decl. +13.956 (ibex-sun) 

error is R.A. +6.575 Decl. +1.523 



for a total 6.538 deg 




No Lo O-mode. 




There is no overlap with orbit 254 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>, "Marty Quinn" <marty.quinn at unh.edu>, "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: Monday, July 21, 2014 2:24:14 PM 
Subject: IBEX Orbit# 255 ATS Approval (2 Aug 14 - 11 Aug 14) 



Guys, 
Here are the planning files and ATS for Orbit# 255. Please respond to this email thread with your questions,comments and approvals. 
Approvals are required before 23 July 14 @1600 UTC 


Please note the following: 
1. No Battery Balancing Commands this Orbit 
2. APL-18 Contact commands 
SSR_Dump commands 
3. Special Ops/Post-LUT Changes 
Hi negative collimator voltage set to 1400 
Hi CEMs A-C set to 1780, CEM D set to 1900 
4. Moon in Lo FOV Commands 
2014-08-07T03:23:15.319Z,MoonInLoFovStart,orbit:255 
2014-08-08T03:45:38.505Z,MoonInLoFovStop,orbit:255 

-- 

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