[Isocops] IBEX Orbit# 242 ATS (4 Apr 14 - 13 Apr 14) - v002 approval

Tue Mar 25 01:32:20 EDT 2014

All, 

I have looked at the orbit 242 ATS, 

IBEX_2014_094_o0242a_v002.scr, 

and I approve. 

The only constraint violation in 

IBEX_2014_094_o0242a_v001.ccvr 

is related to the eclipse and is expected. 

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

IBEX_2014_094_o0242a_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_094_o0242a_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 1/2 days after apogee and ends 2 1/2+ days later (after we descend). Some despinning may be required due to this outage. 

There is one moon in Lo FOV session in arc A. The ATS start time is 8+ hours after that in the OEF and the ATS end time is 4+ hours after 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_Orbit242Contacts.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 241 left us pointing in safe directions for the orbit 242 arc A ascending and descending sequences: 

ibex_rotate -o -u 0.978341,0.193646,0.073151 -w ibex-sun -t 2014/04:04:19:18:51 

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. +13.591 Decl. +5.812 (ibex-sun) 

error is R.A. +2.395 Decl. +1.617 

for a total 2.882 deg 

ibex_rotate -o -u 0.978341,0.193646,0.073151 -w ibex-sun -t 2014/04:08:11:19:23 

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. +17.034 Decl. +7.200 (ibex-sun) 

error is R.A. +5.838 Decl. +3.005 

for a total 6.540 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 0.958507,0.265403,0.104042 -w ibex-sun -t 2014/04:08:13:02:31 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.958507,+0.265403,+0.104042 

which is R.A. +15.477 Decl. +5.972 

missing R.A. +17.099 Decl. +7.227 (ibex-sun) 

error is R.A. +1.622 Decl. +1.255 

for a total 2.042 deg 

ibex_rotate -o -u 0.958507,0.265403,0.104042 -w ibex-sun -t 2014/04:08:14:37:37 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.958507,+0.265403,+0.104042 

which is R.A. +15.477 Decl. +5.972 

missing R.A. +17.159 Decl. +7.252 (ibex-sun) 

error is R.A. +1.682 Decl. +1.280 

for a total 2.105 deg 

ibex_rotate -o -u 0.958507,0.265403,0.104042 -w ibex-sun -t 2014/04:13:02:50:18 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.958507,+0.265403,+0.104042 

which is R.A. +15.477 Decl. +5.972 

missing R.A. +21.173 Decl. +8.907 (ibex-sun) 

error is R.A. +5.696 Decl. +2.935 

for a total 6.365 deg 

The sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 243 apogee: 

ibex_rotate -o -r +21.261 -d +8.943 -w ibex-sun -t 2014/04:13:05:11:18 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.920609,+0.358209,+0.155452 

which is R.A. +21.261 Decl. +8.943 

missing R.A. +21.261 Decl. +8.943 (ibex-sun) 

error is R.A. +0.000 Decl. +0.000 

for a total 0.001 deg 

ibex_rotate -o -r +21.261 -d +8.943 -w ibex-sun -t 2014-04-18T03:51:39.172Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.920609,+0.358209,+0.155452 

which is R.A. +21.261 Decl. +8.943 

missing R.A. +25.968 Decl. +10.714 (ibex-sun) 

error is R.A. +4.707 Decl. +1.771 

for a total 4.965 deg 

No Lo O-mode. 

There is no overlap with orbit 241 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: Saturday, March 22, 2014 3:50:16 PM 
Subject: IBEX Orbit# 242 ATS (4 Apr 14 - 13 Apr 14) 

Guys, 
Here are the planning files and ATS for Orbit# 242. 
Please respond to this email thread with your comments and approvals. 
All comments and approvals are required before 25 Mar 14 @ 1300 UTC 

Note the following: 
1. Moderate Eclipse at PERIGEE 
# Orbit# 242 PERIGEE: Moderate Eclipse Commands 
# 2014-04-13T22:14:01.382Z,PenumbraEntry,orbit:242 
# 2014-04-13T22:14:01.382Z,EclipseEntry,moderate:true,long:false,orbit:242 
ECT_SetLongEclipseFlag TRUE $TIME=2014/04:13:20:14:00 

# 2014-04-13T23:47:28.863Z,PenumbraExit,orbit:242 
# 2014-04-13T23:47:28.863Z,EclipseExit,moderate:true,long:false,orbit:242 
ECT_SetLongEclipseFlag FALSE $TIME=2014/04:13:23:55:00 

2. Sun Maneuver at PERIGEE 
# 2014-04-11T08:17:19.311Z,StarTrackerOutageStart,dueTo:overlap,orbit:242 
# 2014-04-13T23:41:59.601Z,StarTrackerOutageStop,dueTo:overlap,orbit:242 

3. Command Load Constraint Violation Report (CCVR) 
IBEX_2014_094_o0242a_v001.scr 
========================== 
HARD CONSTRAINT VIOLATIONS 
========================== 
NO VIOLATIONS. 
========================== 
SOFT CONSTRAINT VIOLATIONS 
========================== 
IBX-CLC-015: Battery charge falls below minimum from 2014/04/04 15:07:53 UTC - 
2014/04/04 16:03:53 UTC. Lowest charge level is 6425.551810 
watt-minutes during this interval. 
IBX-CLC-015: Battery charge falls below minimum from 2014/04/13 23:08:01 UTC - 
2014/04/13 23:47:28 UTC. Lowest charge level is 5273.452568 
watt-minutes during this interval. 

# Orbit# 242 PERIGEE: Moderate Eclipse Commands 
# 2014-04-13T22:14:01.382Z,PenumbraEntry,orbit:242 
# 2014-04-13T22:14:01.382Z,EclipseEntry,moderate:true,long:false,orbit:242 
# 2014-04-13T23:47:28.863Z,PenumbraExit,orbit:242 
# 2014-04-13T23:47:28.863Z,EclipseExit,moderate:true,long:false,orbit:242 

============== 
OTHER MESSAGES 
============== 
NO MESSAGES. 

-- 

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