[Isocops] IBEX Orbit# 234 ATS (22 Jan 14 - 31 Jan 14) - v001 approval

Sun Jan 12 12:26:25 EST 2014

All, 

I have looked at the orbit 234 ATS, 

IBEX_2014_022_o0234a_v001.scr, 

and I approve. 

There are no constraint violations in 

IBEX_2014_022_o0234a_v001.ccvr. 

The PL commands in the v001 ATS match those in the v004 STF, 

IBEX_2014_022_o0234a_v004.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_022_o0234a_v001.oef, 

and as verified with ibex_orbit. 

The Hi ABAB command sequences and timing look reasonable. 

There are two star tracker outages. The first starts 39+ hours after 15 Re ascending and ends 2+ days later. The second starts at apogee and ends 18+ hours later. Some despinning may be required due to these outages. 

There are no moon in Lo FOV sessions. The OEF shows a moon in Lo FOV session starting before apogee and ending after. The STF only shows the session end so the commands are commented out. These differences are likely caused by different keep out angles. 

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

IBEX_Orbit234Contacts.txt, 

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

No battery cell balancing this orbit; we'll do it again in the next orbit. 

The inertial maneuver at perigee of orbit 233 left us pointing in safe directions for orbit 234 arc A ascending and descending sequences: 

ibex_rotate -o -u 0.550214,-0.722809,-0.418105 -w ibex-sun -t 2014/01:23:04:59:45 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.550214,-0.722809,-0.418105 
which is R.A. +307.279 Decl. -24.715 
missing R.A. +305.234 Decl. -19.504 (ibex-sun) 
error is R.A. +2.045 Decl. +5.211 
for a total 5.544 deg 

ibex_rotate -o -u 0.550214,-0.722809,-0.418105 -w ibex-sun -t 2014/01:27:01:40:32 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.550214,-0.722809,-0.418105 
which is R.A. +307.279 Decl. -24.715 
missing R.A. +309.212 Decl. -18.602 (ibex-sun) 
error is R.A. +1.933 Decl. +6.113 
for a total 6.371 deg 

The sun 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 -r 309.289 -d -18.583 -w ibex-sun -t 2014/01:27:03:28:40 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.600217,-0.733610,-0.318678 
which is R.A. +309.289 Decl. -18.583 
missing R.A. +309.289 Decl. -18.583 (ibex-sun) 
error is R.A. +0.000 Decl. +0.000 
for a total 0.000 deg 

ibex_rotate -o -r 309.289 -d -18.583 -w ibex-sun -t 2014/01:27:04:58:46 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.600217,-0.733610,-0.318678 
which is R.A. +309.289 Decl. -18.583 
missing R.A. +309.352 Decl. -18.567 (ibex-sun) 
error is R.A. +0.063 Decl. +0.016 
for a total 0.062 deg 

ibex_rotate -o -r 309.289 -d -18.583 -w ibex-sun -t 2014/01:31:01:07:14 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.600217,-0.733610,-0.318678 
which is R.A. +309.289 Decl. -18.583 
missing R.A. +313.288 Decl. -17.511 (ibex-sun) 
error is R.A. +3.999 Decl. +1.072 
for a total 3.950 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 235 apogee: 

ibex_rotate -o -u 0.667842,-0.63894,-0.381764 -w ibex-sun -t 2014/01:31:03:03:03 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.667842,-0.638940,-0.381764 
which is R.A. +316.267 Decl. -22.443 
missing R.A. +313.374 Decl. -17.486 (ibex-sun) 
error is R.A. +2.893 Decl. +4.957 
for a total 5.653 deg 

ibex_rotate -o -u 0.667842,-0.63894,-0.381764 -w ibex-sun -t 2014-02-04T23:02:39.533Z 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.667842,-0.638940,-0.381764 
which is R.A. +316.267 Decl. -22.443 
missing R.A. +318.324 Decl. -16.115 (ibex-sun) 
error is R.A. +2.057 Decl. +6.328 
for a total 6.619 deg 

Lo O-mode for a 24 hour period in arc B (plan 6,7,1,1). 

There is no overlap with orbit 233 commands by manual inspection or by checking at 

http://ibex.unh.edu/cgi-bin/ats.cgi . 

Command Approval Checklists are 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>, "Ed Fleming" <Fleming.Ed at orbital.com>, "Harold Kucharek" <Harald.Kucharek at unh.edu>, "Paul Janzen" <Paul.Janzen at mso.umt.edu> 
Sent: Thursday, January 9, 2014 2:49:05 PM 
Subject: IBEX Orbit# 234 ATS (22 Jan 14 - 31 Jan 14) 

Guys, 
Here are the planning files and ATS for Orbit# 234. 
Please respond to this email thread with any questions, comments and approvals. 
All approvals are required before 12 Jan 14 @1800 UTC 

Note the following: 
1. No Battery Balancing this Orbit. 
2. Only the Apogee ground contact commands will be included in the ATS 
3. Special commands: 
Hi negative collimator voltage set to 1400 
Hi ABAB (CEM comparison) 
Lo O-mode (cross calibration) 
4. Command Load Constraint Violation Report 
IBEX_2014_022_o0234a_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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