[Isocops] IBEX Orbit# 269 ATS Approval (6 Dec 14 - 15 Dec 14) - v001 approval

Tue Nov 25 09:10:44 EST 2014

All, 

I have looked at the orbit 269 ATS, 

IBEX_2014_340_o0269a_v001.scr, 

and I approve. 

There are no constraint violations in 

IBEX_2014_340_o0269a_v001.ccvr. 

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

IBEX_2014_340_o0269a_v002.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_340_o0269a_v001.oef, 

and as verified with ibex_orbit. 

There is one star tracker outage. The outage starts before apogee of orbit 268 and ends about 2 days after the orbit 268 perigee. Some despinning may be required due to this outage. 

There is one moon in Lo FOV session in arc B. The ATS start time is about 1 1/2 hours before that in the OEF and the ATS end time is about 5 1/2 hours before that in the OEF. These differences are not unusual. 

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

IBEX_Orbit269Contacts.txt, 

for all contacts (3). 

We are doing battery cell balancing this orbit and the balancing commands are correct and offset by enough time from other commands. 

The sun precession maneuver at perigee of orbit 268 left us pointing in safe directions for the orbit 269 arc A ascending and descending sequences: 

ibex_rotate -o -r +251.925 -d -22.387 -w ibex-sun -t 2014/12:06:15:12:50 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.286878,-0.879003,-0.380861 

which is R.A. +251.925 Decl. -22.387 

missing R.A. +252.903 Decl. -22.512 (ibex-sun) 

error is R.A. +0.978 Decl. +0.125 

for a total 0.912 deg 

ibex_rotate -o -r +251.925 -d -22.387 -w ibex-sun -t 2014/12:10:08:47:58 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.286878,-0.879003,-0.380861 

which is R.A. +251.925 Decl. -22.387 

missing R.A. +256.865 Decl. -22.924 (ibex-sun) 

error is R.A. +4.940 Decl. +0.537 

for a total 4.590 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 -0.211295,-0.892658,-0.398141 -w ibex-sun -t 2014/12:10:10:31:06 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.211295,-0.892658,-0.398141 

which is R.A. +256.683 Decl. -23.462 

missing R.A. +256.942 Decl. -22.930 (ibex-sun) 

error is R.A. +0.259 Decl. +0.532 

for a total 0.583 deg 

ibex_rotate -o -u -0.211295,-0.892658,-0.398141 -w ibex-sun -t 2014/12:10:12:06:12 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.211295,-0.892658,-0.398141 

which is R.A. +256.683 Decl. -23.462 

missing R.A. +257.013 Decl. -22.936 (ibex-sun) 

error is R.A. +0.330 Decl. +0.526 

for a total 0.607 deg 

ibex_rotate -o -u -0.211295,-0.892658,-0.398141 -w ibex-sun -t 2014/12:15:00:43:57 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.211295,-0.892658,-0.398141 

which is R.A. +256.683 Decl. -23.462 

missing R.A. +262.073 Decl. -23.227 (ibex-sun) 

error is R.A. +5.390 Decl. +0.235 

for a total 4.954 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 270 apogee: 

ibex_rotate -o -u -0.094221,-0.942805,-0.319753 -w ibex-sun -t 2014/12:15:03:03:20 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.094221,-0.942805,-0.319753 

which is R.A. +264.293 Decl. -18.648 

missing R.A. +262.189 Decl. -23.232 (ibex-sun) 

error is R.A. +2.104 Decl. +4.584 

for a total 4.988 deg 

ibex_rotate -o -u -0.094221,-0.942805,-0.319753 -w ibex-sun -t 2014-12-20T03:05:11.385Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.094221,-0.942805,-0.319753 

which is R.A. +264.293 Decl. -18.648 

missing R.A. +267.660 Decl. -23.453 (ibex-sun) 

error is R.A. +3.367 Decl. +4.805 

for a total 5.741 deg 

No Lo O-mode. 

There is no overlap with orbit 268 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: "Kucharek, Harald" <Harald.Kucharek at unh.edu>, "IBEX FDG" <ibex at applieddefense.com>, "OPS, ISOC" <isocops at lists.sr.unh.edu>, "Fairchild, Ken" <fair-play at comcast.net>, "Quinn, Marty" <marty.quinn at unh.edu>, "Reno, Chelle" <mreno at swri.edu>, "Angold, Nigel" <ngangold at earthlink.net>, "Paul Janzen" <paul.janzen at umontana.edu>, "Robert Lockwood" <Lockwood.Robert at Orbital.com>, "Tyler, Ryan" <tyler.ryan at orbital.com>, "Wesley, Sheral" <wesley.sheral at orbital.com>, "Perry, Tim" <perry.tim at orbital.com> 
Sent: Sunday, November 23, 2014 11:32:16 PM 
Subject: IBEX Orbit# 269 ATS Approval (6 Dec 14 - 15 Dec 14) 

Guys, 
Here are the planning files and ATS for Orbit# 269. Please respond to this email thread with your comments and approvals. 
Approvals are required before 26 Nov 14 @ 1400 UTC 
Note the following: 
1. The OEF is generated with Orbit# 267 oef because of the PERIGEE sun maneuver in Orbit# 268 
2. Battery Balancing at PERIGEE 
2014-12-15T12:23:38.497Z,Perigee,orbit:269 
SetLongEclipseFlag TRUE $TIME=2014/12:15:12:00:00 
SetLongEclipseFlag FALSE $TIME=2014/12:15:13:30:00 
3. Command Load Constraint Violation Report 
IBEX_2014_340_o0269a_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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