[Isocops] IBEX Orbit# 201 ATS v003

fair-play at comcast.net fair-play at comcast.net
Sun Mar 17 10:51:29 EDT 2013 

All, 


I've looked at the orbit 201 ATS, 


IBEX_2013_087_o0201a_v003.scr 


and I approve. 


There are no constraint violations in 


IBEX_2013_087_o0201a_v003.ccvr. 


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


IBEX_2013_087_o0201a_v001.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 file, 


IBEX_2013_087_o0201a_v003.oef, 


and as verified with ibex_orbit. 


There are two star tracker outages. The first one starts at 14 Re ascending and runs for about 1.75 days. The second one starts almost 2 days after apogee and runs for about 2 days. 


There is one moon in Lo FOV session in arc B. The ATS start time is about 1 hour after the OEF start time and the ATS end time is about 2 hours before the OEF end time. 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_Orbit201Contacts.txt, 


for all contacts (2). 


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 200 left us pointing in safe directions for orbit 201 arc A ascending and descending sequences: 



ibex_rotate -o -u 0.995298,0.092384,0.029091 -w ibex-sun -t 2013/03:29:02:21:06 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.995298,+0.092384,+0.029091 
which is R.A. +5.303 Decl. +1.667 
missing R.A. +7.719 Decl. +3.333 (ibex-sun) 
error is R.A. +2.416 Decl. +1.666 
for a total 2.933 deg 



ibex_rotate -o -u 0.995298,0.092384,0.029091 -w ibex-sun -t 2013/04:01:17:17:55 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.995298,+0.092384,+0.029091 
which is R.A. +5.303 Decl. +1.667 
missing R.A. +11.083 Decl. +4.728 (ibex-sun) 
error is R.A. +5.780 Decl. +3.061 
for a total 6.532 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 0.984314,0.165583,0.060892 -w ibex-sun -t 2013/04:01:19:01:03 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.984314,+0.165583,+0.060892 
which is R.A. +9.549 Decl. +3.491 
missing R.A. +11.148 Decl. +4.755 (ibex-sun) 
error is R.A. +1.599 Decl. +1.264 
for a total 2.035 deg 



ibex_rotate -o -u 0.984314,0.165583,0.060892 -w ibex-sun -t 2013/04:01:20:36:09 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.984314,+0.165583,+0.060892 
which is R.A. +9.549 Decl. +3.491 
missing R.A. +11.207 Decl. +4.780 (ibex-sun) 
error is R.A. +1.658 Decl. +1.289 
for a total 2.097 deg 



ibex_rotate -o -u 0.984314,0.165583,0.060892 -w ibex-sun -t 2013/04:06:07:46:58 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.984314,+0.165583,+0.060892 
which is R.A. +9.549 Decl. +3.491 
missing R.A. +15.168 Decl. +6.472 (ibex-sun) 
error is R.A. +5.619 Decl. +2.981 
for a total 6.341 deg 


The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 202 apogee: 



ibex_rotate -o -u 0.967472,0.235916,0.091328 -w ibex-sun -t 2013/04:06:09:46:19 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.967472,+0.235916,+0.091328 
which is R.A. +13.704 Decl. +5.240 
missing R.A. +15.242 Decl. +6.504 (ibex-sun) 
error is R.A. +1.538 Decl. +1.264 
for a total 1.985 deg 



ibex_rotate -o -u 0.967472,0.235916,0.091328 -w ibex-sun -t 2013-04-11T09:32:27.445Z 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.967472,+0.235916,+0.091328 
which is R.A. +13.704 Decl. +5.240 
missing R.A. +19.944 Decl. +8.376 (ibex-sun) 
error is R.A. +6.240 Decl. +3.136 
for a total 6.944 deg 


No Lo O-mode. 


There is no overlap with orbit 200 commands by manual inspection or by checking at 


http://ibex.unh.edu/cgi-bin/ats.cgi . 



The Command Approval Checklist is attached. There were two things that I noticed as I was going through the checklist: 


1. The ibex/moc/Soc-Moc/stf directory has disappeared on the SFTP server. 
2. The orbit 200 v001 OEF file is used as input. We probably should have used the v002 OEF file but since the files seem equivalent except for the time range covered, this shouldn't be a problem. 


Ken 



----- Original Message -----
From: "Ibex Mission Operations" <ibexops at gmail.com> 
To: "Bret Hautamaki" <hautamaki.bret at orbital.com>, "IBEX-FDG" <IBEX.fdg at applieddefense.com>, "IBEXOPS/ORB" <IBEXops at orbital.com>, "ISOC at New Hampshire" <isocops at lists.sr.unh.edu>, "John Cavallo" <cavallo.john at orbital.com>, "Mark Tapley" <mtapley at swri.edu>, "Nigel Angold" <ngangold at earthlink.net>, "Robert Lockwood" <Lockwood.Robert at orbital.com>, "Roland Vanderspek" <roland at space.mit.edu>, "Ryan Tyler" <tyler.ryan at orbital.com>, "Sheral Wesley" <wesley.sheral at orbital.com>, "Thomas Regiec" <regiec.thomas at orbital.com>, "Tim Perry" <perry.tim at orbital.com> 
Sent: Saturday, March 16, 2013 8:06:27 PM 
Subject: [Isocops] IBEX Orbit# 201 ATS v003 


Guys, 
The third time's the charm. 

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


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

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