[Isocops] IBEX ORbit# 250 ATS (17 Jun 14 - 26 Jun 14) - v001 approval

Fri Jun 6 14:06:55 EDT 2014

All, 

I have looked at the orbit 250 ATS, 

IBEX_2014_168_o0250a_v001.scr, 

and I approve. 

There are no constraint violations in 

IBEX_2014_168_o0250a_v001.ccvr. 

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

IBEX_2014_168_o0250a_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_168_o0250a_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 about 3 1/2 hours after 15 Re descending and ends 6+ hours later. No despinning should be required due to the outage as it occurs after we descend. 

There is one moon in Lo FOV session in arc A. The ATS start time is almost 3 hours after that in the OEF and the ATS end time is almost 2 hours after that in the OEF. These differences are not unusual. 

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

IBEX_Orbit250Contacts.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 249 left us pointing in safe directions for the orbit 250 arc A ascending and descending sequences: 

ibex_rotate -o -u 0.107645,0.91606,0.386325 -w ibex-sun -t 2014/06:17:23:21:22 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.107645,+0.916060,+0.386325 

which is R.A. +83.298 Decl. +22.726 

missing R.A. +86.132 Decl. +23.387 (ibex-sun) 

error is R.A. +2.834 Decl. +0.661 

for a total 2.690 deg 

ibex_rotate -o -u 0.107645,0.91606,0.386325 -w ibex-sun -t 2014/06:21:14:27:20 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.107645,+0.916060,+0.386325 

which is R.A. +83.298 Decl. +22.726 

missing R.A. +90.013 Decl. +23.404 (ibex-sun) 

error is R.A. +6.715 Decl. +0.678 

for a total 6.215 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 0.032564,0.920976,0.388256 -w ibex-sun -t 2014/06:21:16:10:28 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.032564,+0.920976,+0.388256 

which is R.A. +87.975 Decl. +22.846 

missing R.A. +90.089 Decl. +23.404 (ibex-sun) 

error is R.A. +2.114 Decl. +0.558 

for a total 2.023 deg 

ibex_rotate -o -u 0.032564,0.920976,0.388256 -w ibex-sun -t 2014/06:21:17:45:34 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.032564,+0.920976,+0.388256 

which is R.A. +87.975 Decl. +22.846 

missing R.A. +90.159 Decl. +23.404 (ibex-sun) 

error is R.A. +2.184 Decl. +0.558 

for a total 2.085 deg 

ibex_rotate -o -u 0.032564,0.920976,0.388256 -w ibex-sun -t 2014/06:26:03:51:48 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.032564,+0.920976,+0.388256 

which is R.A. +87.975 Decl. +22.846 

missing R.A. +94.709 Decl. +23.373 (ibex-sun) 

error is R.A. +6.734 Decl. +0.527 

for a total 6.216 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 251 apogee: 

ibex_rotate -o -u -0.044778,0.920484,0.388207 -w ibex-sun -t 2014/06:26:06:02:22 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.044778,+0.920484,+0.388207 

which is R.A. +92.785 Decl. +22.843 

missing R.A. +94.796 Decl. +23.372 (ibex-sun) 

error is R.A. +2.011 Decl. +0.529 

for a total 1.923 deg 

ibex_rotate -o -u -0.044778,0.920484,0.388207 -w ibex-sun -t 2014-07-01T07:52:59.635Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.044778,+0.920484,+0.388207 

which is R.A. +92.785 Decl. +22.843 

missing R.A. +100.104 Decl. +23.079 (ibex-sun) 

error is R.A. +7.319 Decl. +0.236 

for a total 6.743 deg 

No Lo O-mode. 

There is no overlap with orbit 249 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: "Harold Kucharek" <Harald.Kucharek at unh.edu>, "IBEX FDG" <ibex at applieddefense.com>, "ISOC at New Hampshire" <isocops at lists.sr.unh.edu>, "Ken Fairchild" <fair-play at comcast.net>, "Michelle Reno" <mreno at swri.edu>, "Nigel Angold" <ngangold at earthlink.net>, "Paul Janzen" <paul.janzen at umontana.edu>, "Robert Lockwood" <Lockwood.Robert at Orbital.com>, "Ryan Tyler" <tyler.ryan at orbital.com>, "Sheral Wesley" <wesley.sheral at orbital.com>, "Tim Perry" <perry.tim at orbital.com> 
Sent: Wednesday, June 4, 2014 10:00:21 PM 
Subject: IBEX ORbit# 250 ATS (17 Jun 14 - 26 Jun 14) 

Guys, 
Here are the planning files and ATS for Orbit# 250. 
Please respond to this email thread with your questions and approvals. 
Approvals are required before 7 June 14 @1800 UTC 

Please note the following: 
1. Battery Balancing at Perigee 
PERIGEE:2014-06-26T15:42:23.492Z,Perigee,orbit:250 
ECT_SetLongEclipseFlag TRUE $TIME=2014/06:26:15:00:00 
ECT_SetLongEclipseFlag FALSE $TIME=2014/06:26:16:30:00 
2. Moon in Lo FOV 
# 2014-06-18T00:51:51.226Z,MoonInLoFovStart,orbit:250 
# 2014-06-18T11:53:02.918Z,MoonInLoFovStop,orbit:250 
3. Special Ops/Post-LUT Changes 
Hi negative collimator voltage set to 1400 
Hi ABAB (CEM comparison) 
4. Command Load Constraint Violation Report (CCVR) 
IBEX_2014_168_o0250a_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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