[Isocops] IBEX Orbit# 239 ATS (8 Mar 14 - 17 Mar 14) - v001 approval

Wed Feb 26 01:52:24 EST 2014

All, 

I have looked at the orbit 239 ATS, 

IBEX_2014_067_o0239a_v001.scr, 

and I approve. 

There are no constraint violations in 

IBEX_2014_067_o0239a_v001.ccvr. 

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

IBEX_2014_067_o0239a_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_067_o0239a_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 16+ hours after apogee and runs for 4+ days. 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 very close to that in the OEF and the ATS end time is about 3 hours after that in the OEF. The difference in the end times is not unusual. 

The ground station command sequence is correct and the timing and bit rate match those in the contacts file, 

IBEX_Orbit239Contacts.txt, 

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

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 238 left us pointing in safe directions for orbit 239 arc A ascending and descending sequences: 

ibex_rotate -o -u 0.96534,-0.235325,-0.112874 -w ibex-sun -t 2014/03:08:15:46:47 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.965340,-0.235325,-0.112874 
which is R.A. +346.300 Decl. -6.481 
missing R.A. +348.811 Decl. -4.815 (ibex-sun) 
error is R.A. +2.511 Decl. +1.666 
for a total 3.004 deg 

ibex_rotate -o -u 0.96534,-0.235325,-0.112874 -w ibex-sun -t 2014/03:12:05:23:05 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.965340,-0.235325,-0.112874 
which is R.A. +346.300 Decl. -6.481 
missing R.A. +352.138 Decl. -3.431 (ibex-sun) 
error is R.A. +5.838 Decl. +3.050 
for a total 6.566 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 0.983271,-0.16285,-0.081591 -w ibex-sun -t 2014/03:12:07:06:13 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.983271,-0.162850,-0.081591 
which is R.A. +350.596 Decl. -4.680 
missing R.A. +352.203 Decl. -3.404 (ibex-sun) 
error is R.A. +1.607 Decl. +1.276 
for a total 2.049 deg 

ibex_rotate -o -u 0.983271,-0.16285,-0.081591 -w ibex-sun -t 2014/03:12:08:41:19 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.983271,-0.162850,-0.081591 
which is R.A. +350.596 Decl. -4.680 
missing R.A. +352.262 Decl. -3.378 (ibex-sun) 
error is R.A. +1.666 Decl. +1.302 
for a total 2.111 deg 

ibex_rotate -o -u 0.983271,-0.16285,-0.081591 -w ibex-sun -t 2014/03:16:18:30:32 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.983271,-0.162850,-0.081591 
which is R.A. +350.596 Decl. -4.680 
missing R.A. +356.199 Decl. -1.640 (ibex-sun) 
error is R.A. +5.603 Decl. +3.040 
for a total 6.367 deg 

The sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 240 apogee: 

ibex_rotate -o -r +356.280 -d -1.604 -w ibex-sun -t 2014/03:16:20:37:57 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.997502,-0.064855,-0.027991 
which is R.A. +356.280 Decl. -1.604 
missing R.A. +356.280 Decl. -1.604 (ibex-sun) 
error is R.A. +0.000 Decl. +0.000 
for a total 0.000 deg 

ibex_rotate -o -r +356.280 -d -1.604 -w ibex-sun -t 2014-03-21T17:42:33.877Z 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.997502,-0.064855,-0.027991 
which is R.A. +356.280 Decl. -1.604 
missing R.A. +0.839 Decl. +0.328 (ibex-sun) 
error is R.A. +355.441 Decl. +1.932 
for a total 4.951 deg 

No Lo O-mode. 

There is no overlap with orbit 238 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: Sunday, February 23, 2014 6:33:12 PM 
Subject: IBEX Orbit# 239 ATS (8 Mar 14 - 17 Mar 14) 

Guys, 
Here are the planning files and ATS for Orbit# 239. 
Please respond to this email thread with any comments and approvals. 
All approvals are required before 26 Feb 14 @ 1600 UTC 

1. Battery Balancing at PERIGEE 
Orbit# 239 PERIGEE: Battery Balancing 
ECT_SetLongEclipseFlag TRUE $TIME=2014/03:17:06:00:00 
ECT_SetLongEclipseFlag FALSE $TIME=2014/03:17:07:30:00 

2. Orbit# 239 APOGEE: Moon in Lo FOV 
# 2014-03-08T17:06:53.570Z,MoonInLoFovStart,orbit:239 
# 2014-03-09T03:08:54.977Z,MoonInLoFovStop,orbit:239 

3. Sun Maneuver at PERIGEE 

4. Command Load Constraint Violation Report 
# IBEX_2014_067_o0239a_v001.scr 
========================== 
HARD CONSTRAINT VIOLATIONS 
========================== 
NO VIOLATIONS. 
========================== 
SOFT CONSTRAINT VIOLATIONS 
========================== 
NO VIOLATIONS. 
============== 
OTHER MESSAGES 
============== 
NO MESSAGES. 

-- 

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