[Isocops] IBEX Orbit# 247 ATS (20 May 14 - 29 May 14) - v001 approval

Fri May 9 15:51:42 EDT 2014

All, 

I have looked at the orbit 247 ATS, 

IBEX_2014_140_o0247a_v001.scr, 

and I approve. 

There are no constraint violations in 

IBEX_2014_140_o0247a_v001.ccvr. 

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

IBEX_2014_140_o0247a_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_140_o0247a_v001.oef, 

and as verified with ibex_orbit. 

The Hi ABAB command sequences and timing look reasonable. 

There is one star tracker outage in arc B. It starts about 7 hours before 15 Re descending and runs for 12 1/2 hours. 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_Orbit247Contacts.txt, 

for the apogee contact. All other contacts will be blind acquisitions. 

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 246 left us pointing in safe directions for the orbit 247 arc A ascending and descending sequences: 

ibex_rotate -o -u 0.543598,0.773979,0.324743 -w ibex-sun -t 2014/05:21:01:34:08 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.543598,+0.773979,+0.324743 

which is R.A. +54.918 Decl. +18.950 

missing R.A. +57.535 Decl. +20.089 (ibex-sun) 

error is R.A. +2.617 Decl. +1.139 

for a total 2.717 deg 

ibex_rotate -o -u 0.543598,0.773979,0.324743 -w ibex-sun -t 2014/05:24:17:31:57 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.543598,+0.773979,+0.324743 

which is R.A. +54.918 Decl. +18.950 

missing R.A. +61.349 Decl. +20.794 (ibex-sun) 

error is R.A. +6.431 Decl. +1.844 

for a total 6.322 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 0.477432,0.810131,0.340215 -w ibex-sun -t 2014/05:24:19:15:05 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.477432,+0.810131,+0.340215 

which is R.A. +59.488 Decl. +19.890 

missing R.A. +61.422 Decl. +20.808 (ibex-sun) 

error is R.A. +1.934 Decl. +0.918 

for a total 2.032 deg 

ibex_rotate -o -u 0.477432,0.810131,0.340215 -w ibex-sun -t 2014/05:24:20:50:11 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.477432,+0.810131,+0.340215 

which is R.A. +59.488 Decl. +19.890 

missing R.A. +61.490 Decl. +20.820 (ibex-sun) 

error is R.A. +2.002 Decl. +0.930 

for a total 2.094 deg 

ibex_rotate -o -u 0.477432,0.810131,0.340215 -w ibex-sun -t 2014/05:29:08:19:43 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.477432,+0.810131,+0.340215 

which is R.A. +59.488 Decl. +19.890 

missing R.A. +65.925 Decl. +21.602 (ibex-sun) 

error is R.A. +6.437 Decl. +1.712 

for a total 6.258 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 248 apogee: 

ibex_rotate -o -u 0.407394,0.841798,0.354128 -w ibex-sun -t 2014/05:29:14:22:37 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.407394,+0.841798,+0.354128 

which is R.A. +64.175 Decl. +20.740 

missing R.A. +66.162 Decl. +21.639 (ibex-sun) 

error is R.A. +1.987 Decl. +0.899 

for a total 2.060 deg 

ibex_rotate -o -u 0.407394,0.841798,0.354128 -w ibex-sun -t 2014-06-03T13:18:09.986Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.407394,+0.841798,+0.354128 

which is R.A. +64.175 Decl. +20.740 

missing R.A. +71.356 Decl. +22.298 (ibex-sun) 

error is R.A. +7.180 Decl. +1.558 

for a total 6.858 deg 

No Lo O-mode. 

There is no overlap with orbit 246 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: "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>, "Nigel Angold" <ngangold at earthlink.net>, "Robert Lockwood" <Lockwood.Robert at Orbital.com>, "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, May 7, 2014 10:22:05 AM 
Subject: IBEX Orbit# 247 ATS (20 May 14 - 29 May 14) 

Guys, 
Here are the planning files and ATS for Orbit# 247. 
Please respond to this email thread with approvals and comments. 
Approvals are required before 10 May 14 @1200 UTC 

Note the following: 
1. Battery Balancing at Perigee 
Orbit# 247 PERIGEE: Battery Balancing Commands 
SetLongEclipseFlag TRUE $TIME=2014/05:29:19:00:00 
SetLongEclipseFlag FALSE $TIME=2014/05:29:20:30:00Only Apogee 
2. Only Apogee contact commands 

-- 

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