[Isocops] IBEX Orbit# 207 ATS (22 May 13 - 31 May 13)

fair-play at comcast.net fair-play at comcast.net
Fri May 10 10:29:14 EDT 2013 

All, 

I have looked at the orbit 207 ATS, 

IBEX_2013_142_o0207a_v001.scr, 

and I approve. 

There is one constraint violation in 

IBEX_2013_142_o0207a_v001.ccvr 

but it is related to the eclipse and is expected. 

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

IBEX_2013_142_o0207a_v002.stf. 

Ascending and descending command sequences are consistent with each other and 15 RE ascending (and eclipse end), the apogee maneuver time and 15 Re descending as determined from the OEF file, 

IBEX_2013_142_o0207a_v001.oef, 

and as verified with ibex_orbit. 

There are two star tracker outages in arc B. The first starts about 10 hours after apogee and runs for almost 2 days. The second starts about 5 1/2 hours before 15 Re and ends about 5 hours after the maneuver window opens (delaying the maneuver). 

There are no moon in Lo FOV sessions. 

The ground station command sequences are correct and bit rates match those in the contacts file, 

IBEX_Orbit207Contacts.txt 

for all contacts (4). 

The LE flag is set during the eclipse and the balancing command timing and states match those in the CAR, 

CAR-615-EclipseCommands.doc. 

The commands are offset by enough time from other commands. 

The inertial precession maneuver at perigee of orbit 206 left us pointing in safe directions for orbit 207 arc A ascending and descending sequences: 

ibex_rotate -o -u 0.511732,0.7922,0.33249 -w ibex-sun -t 2013/05:23:08:15:00 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.511732,+0.792200,+0.332490 
which is R.A. +57.139 Decl. +19.420 
missing R.A. +60.108 Decl. +20.594 (ibex-sun) 
error is R.A. +2.968 Decl. +1.174 
for a total 3.026 deg 

ibex_rotate -o -u 0.511732,0.7922,0.33249 -w ibex-sun -t 2013/05:26:13:18:22 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.511732,+0.792200,+0.332490 
which is R.A. +57.139 Decl. +19.420 
missing R.A. +63.454 Decl. +21.164 (ibex-sun) 
error is R.A. +6.315 Decl. +1.744 
for a total 6.174 deg 

The inertial precession 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 0.446342,0.824941,0.346772 -w ibex-sun -t2013/05:26:15:01:30 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.446342,+0.824941,+0.346772 
which is R.A. +61.584 Decl. +20.290 
missing R.A. +63.528 Decl. +21.177 (ibex-sun) 
error is R.A. +1.944 Decl. +0.887 
for a total 2.022 deg 

ibex_rotate -o -u 0.446342,0.824941,0.346772 -w ibex-sun -t2013/05:26:16:36:36 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.446342,+0.824941,+0.346772 
which is R.A. +61.584 Decl. +20.290 
missing R.A. +63.595 Decl. +21.188 (ibex-sun) 
error is R.A. +2.011 Decl. +0.898 
for a total 2.084 deg 

ibex_rotate -o -u 0.446342,0.824941,0.346772 -w ibex-sun -t2013/05:30:23:14:38 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.446342,+0.824941,+0.346772 
which is R.A. +61.584 Decl. +20.290 
missing R.A. +67.840 Decl. +21.875 (ibex-sun) 
error is R.A. +6.256 Decl. +1.585 
for a total 6.048 deg 

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 208 apogee: 

ibex_rotate -o -u 0.378243,0.853272,0.358971 -w ibex-sun -t 2013/05:31:06:50:51 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.378243,+0.853272,+0.358971 
which is R.A. +66.093 Decl. +21.037 
missing R.A. +68.139 Decl. +21.922 (ibex-sun) 
error is R.A. +2.046 Decl. +0.885 
for a total 2.099 deg 

ibex_rotate -o -u 0.378243,0.853272,0.358971 -w ibex-sun -t 2013-06-04T21:28:50.845Z 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.378243,+0.853272,+0.358971 
which is R.A. +66.093 Decl. +21.037 
missing R.A. +72.994 Decl. +22.484 (ibex-sun) 
error is R.A. +6.901 Decl. +1.447 
for a total 6.570 deg 

No Lo O-mode. 

There is no overlap with orbit 206 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: "Bret Hautamaki" <hautamaki.bret at orbital.com>, "FDG, IBEX" <IBEX.fdg at applieddefense.com>, "IBEXOPS/ORB" <IBEXops at orbital.com>, "OPS, ISOC" <isocops at lists.sr.unh.edu>, "John Cavallo" <cavallo.john at orbital.com>, "Tapley, Mark" <mtapley at swri.edu>, "Angold, Nigel" <ngangold at earthlink.net>, "Robert Lockwood" <Lockwood.Robert at orbital.com>, "Vanderspek, Roland" <roland at space.mit.edu>, "Tyler, Ryan" <tyler.ryan at orbital.com>, "Wesley, Sheral" <wesley.sheral at orbital.com>, "Thomas Regiec" <regiec.thomas at orbital.com>, "Perry, Tim" <perry.tim at orbital.com> 
Sent: Wednesday, May 8, 2013 4:10:07 PM 
Subject: [Isocops] IBEX Orbit# 207 ATS (22 May 13 - 31 May 13) 


Guys, 
Here are the planning files and ATS for Orbit# 207. 
Please respond to this email thread with approvals and comments. All approvals and comments are 
required before 11 May 13 @1800 UTC. 

Please note the following: 
1. Moderate Eclipse commands are placed at teh beginning of the ATS. 
- Commands to increase/decrease EPS telemetry 
- LE Flag commands 

2. There are (4) contacts within this ATS 

3. Command Load Constraint Violation Report 
# IBEX_2013_142_o0207a_v001.scr 
========================== 
HARD CONSTRAINT VIOLATIONS 
========================== 
NO VIOLATIONS. 
========================== 
SOFT CONSTRAINT VIOLATIONS 
========================== 
IBX-CLC-015: Battery charge falls below minimum from 2013/05/23 04:22:43 UTC - 
2013/05/23 07:16:04 UTC. Lowest charge level is 4409.024562 
watt-minutes during this interval. 

#LE Commands are sent during this time 
@ECT_SetLongEclipseFlag TRUE $TIME=2013/05:23:01:56:04 
@ECT_SetLongEclipseFlag FALSE $TIME=2013/05:23:06:15:00 
============== 
OTHER MESSAGES 
============== 
NO MESSAGES. 




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

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