[Isocops] IBEX Orbit# 241 ATS (26 Mar 14 - 4 Apr 14) - v001 approval

Sun Mar 16 01:50:32 EDT 2014

All, 

I have looked at the orbit 241 ATS, 

IBEX_2014_085_o0241a_v001.scr, 

and I approve. 

The only constraint violation in 

IBEX_2014_085_o0241a_v001.ccvr 

is related to the eclipse and is expected. 

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

IBEX_2014_085_o0241a_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_085_o0241a_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 almost 2 days after apogee and ends about 2 days later. 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_Orbit241Contacts.txt, 

for the apogee contact. All other contacts will be blind acquisitions while we are doing Hi ABAB operations. 

The LE flag is set during the eclipse and the balancing command timing and states look correct. 

The inertial precession maneuver at perigee of orbit 240 left us pointing in safe directions for the orbit 241 arc A ascending and descending sequences: 

ibex_rotate -o -u 0.998634,0.051025,0.011292 -w ibex-sun -t 2014/03:26:17:40:29 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.998634,+0.051025,+0.011292 

which is R.A. +2.925 Decl. +0.647 

missing R.A. +5.336 Decl. +2.303 (ibex-sun) 

error is R.A. +2.411 Decl. +1.656 

for a total 2.924 deg 

ibex_rotate -o -u 0.998634,0.051025,0.011292 -w ibex-sun -t 2014/03:30:06:16:00 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.998634,+0.051025,+0.011292 

which is R.A. +2.925 Decl. +0.647 

missing R.A. +8.615 Decl. +3.679 (ibex-sun) 

error is R.A. +5.690 Decl. +3.032 

for a total 6.443 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 0.991486,0.123127,0.042381 -w ibex-sun -t 2014/03:30:07:59:08 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.991486,+0.123127,+0.042381 

which is R.A. +7.079 Decl. +2.429 

missing R.A. +8.679 Decl. +3.706 (ibex-sun) 

error is R.A. +1.600 Decl. +1.277 

for a total 2.046 deg 

ibex_rotate -o -u 0.991486,0.123127,0.042381 -w ibex-sun -t 2014/03:30:09:34:14 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.991486,+0.123127,+0.042381 

which is R.A. +7.079 Decl. +2.429 

missing R.A. +8.739 Decl. +3.732 (ibex-sun) 

error is R.A. +1.660 Decl. +1.303 

for a total 2.108 deg 

ibex_rotate -o -u 0.991486,0.123127,0.042381 -w ibex-sun -t 2014/04:03:19:47:27 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.991486,+0.123127,+0.042381 

which is R.A. +7.079 Decl. +2.429 

missing R.A. +12.653 Decl. +5.432 (ibex-sun) 

error is R.A. +5.574 Decl. +3.003 

for a total 6.319 deg 

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 242 apogee: 

ibex_rotate -o -u 0.978341,0.193646,0.073151 -w ibex-sun -t 2014/04:03:21:58:53 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.978341,+0.193646,+0.073151 

which is R.A. +11.196 Decl. +4.195 

missing R.A. +12.734 Decl. +5.467 (ibex-sun) 

error is R.A. +1.538 Decl. +1.272 

for a total 1.992 deg 

ibex_rotate -o -u 0.978341,0.193646,0.073151 -w ibex-sun -t 2014-04-08T22:52:29.671Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.978341,+0.193646,+0.073151 

which is R.A. +11.196 Decl. +4.195 

missing R.A. +17.471 Decl. +7.380 (ibex-sun) 

error is R.A. +6.275 Decl. +3.185 

for a total 7.007 deg 

No Lo O-mode. 

There is no overlap with orbit 240 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: joe at boulder.swri.edu, "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>, "Ken Fairchild" <fair-play at comcast.net>, "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: Wednesday, March 12, 2014 2:52:00 PM 
Subject: IBEX Orbit# 241 ATS (26 Mar 14 - 4 Apr 14) 

Guys, 
Here are the planning files and ATS for Orbit# 241 
Please respond to this email thread with questions and approvals. 
All approvals are required before16 Mar 14 @1600 UTC 

Please note the following: 
1. Moderate Eclipse 
The eclipse flag is set 2 hrs prior to the eclipse 
# Orbit# 241 PERIGEE: Moderate Eclipse Commands 
# 2014-04-04T13:49:36.488Z,PenumbraEntry,orbit:241 
# 2014-04-04T13:49:36.488Z,EclipseEntry,moderate:true,long:false,orbit:241 
ECT_SetLongEclipseFlag TRUE $TIME=2014/04:04:11:49:00 

# 2014-04-04T15:07:53.204Z,PenumbraExit,orbit:241 
# 2014-04-04T15:07:53.204Z,EclipseExit,moderate:true,long:false,orbit:241 

ECT_SetLongEclipseFlag FALSE $TIME=2014/04:04:15:30:00 

2. Special Ops/Post-LUT Changes 
Hi negative collimator voltage set to 1400 
Hi ABAB (CEM comparison) 

3. Command Load Constraint Violation Report (CCVR) 
IBEX_2014_085_o0241a_v001.scr 
========================== 
HARD CONSTRAINT VIOLATIONS 
========================== 
NO VIOLATIONS. 
========================== 
SOFT CONSTRAINT VIOLATIONS 
========================== 
IBX-CLC-015: Battery charge falls below minimum from 2014/04/04 14:43:36 UTC - 
2014/04/04 15:07:53 UTC. Lowest charge level is 6395.211460 
watt-minutes during this interval. 

* Moderate Eclipse* 
============== 
OTHER MESSAGES 
============== 
NO MESSAGES. 

-- 

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