[Isocops] IBEX Orbit# 251 ATS (26 Jun14 - 5 Jul 14) - v001 approval

Sat Jun 14 19:48:54 EDT 2014

All, 

I have looked at the orbit 251 ATS, 

IBEX_2014_177_o0251a_v001.scr, 

and I approve. 

There are no constraint violations in 

IBEX_2014_177_o0251a_v001.ccvr. 

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

IBEX_2014_177_o0251a_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_177_o0251a_v001.oef 

and as verified with ibex_orbit. 

There is one star tracker outage. It starts about 5 1/4 hours after 15 Re descending and ends about 5 3/4 hours later. No despinning should be required due to the outage as it occurs after we descend. 

The OEF shows two moon in Lo FOV sessions separated by two hours. They are coalesced into a single session in the ATS file. Thus, t here is one moon in Lo FOV session in arc B. The ATS start time is about 1 1/4 hours after the start time of the first session in the OEF and the ATS end time is about 2 1/2 hours before that of the second session in the OEF. These differences are not unusual. 

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

IBEX_Orbit251Contacts.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 250 left us pointing in safe directions for the orbit 251 arc A ascending and descending sequences: 

ibex_rotate -o -u -0.044778,0.920484,0.388207 -w ibex-sun -t 2014/06:27:03:29:30 

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. +95.665 Decl. +23.331 (ibex-sun) 

error is R.A. +2.880 Decl. +0.488 

for a total 2.694 deg 

ibex_rotate -o -u -0.044778,0.920484,0.388207 -w ibex-sun -t 2014/06:30:20:17:56 

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. +99.595 Decl. +23.110 (ibex-sun) 

error is R.A. +6.810 Decl. +0.267 

for a total 6.275 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 -0.120898,0.914731,0.385552 -w ibex-sun -t 2014/06:30:22:01:04 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.120898,+0.914731,+0.385552 

which is R.A. +97.529 Decl. +22.678 

missing R.A. +99.671 Decl. +23.105 (ibex-sun) 

error is R.A. +2.142 Decl. +0.427 

for a total 2.019 deg 

ibex_rotate -o -u -0.120898,0.914731,0.385552 -w ibex-sun -t 2014/06:30:23:36:10 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.120898,+0.914731,+0.385552 

which is R.A. +97.529 Decl. +22.678 

missing R.A. +99.741 Decl. +23.101 (ibex-sun) 

error is R.A. +2.212 Decl. +0.423 

for a total 2.081 deg 

ibex_rotate -o -u -0.120898,0.914731,0.385552 -w ibex-sun -t 2014/07:05:11:46:56 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.120898,+0.914731,+0.385552 

which is R.A. +97.529 Decl. +22.678 

missing R.A. +104.367 Decl. +22.787 (ibex-sun) 

error is R.A. +6.838 Decl. +0.109 

for a total 6.307 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 252 apogee: 

ibex_rotate -o -u -0.198723,0.903093,0.380699 -w ibex-sun -t 2014/07:05:13:56:53 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.198723,+0.903093,+0.380699 

which is R.A. +102.410 Decl. +22.377 

missing R.A. +104.453 Decl. +22.780 (ibex-sun) 

error is R.A. +2.043 Decl. +0.403 

for a total 1.929 deg 

ibex_rotate -o -u -0.198723,0.903093,0.380699 -w ibex-sun -t 2014-07-10T13:36:20.842Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.198723,+0.903093,+0.380699 

which is R.A. +102.410 Decl. +22.377 

missing R.A. +109.583 Decl. +22.184 (ibex-sun) 

error is R.A. +7.173 Decl. +0.193 

for a total 6.639 deg 

No Lo O-mode. 

There is no overlap with orbit 250 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>, "Marty Quinn" <marty.quinn at unh.edu>, "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: Friday, June 13, 2014 7:56:46 AM 
Subject: IBEX Orbit# 251 ATS (26 Jun14 - 5 Jul 14) 

Guys, 
Here are the planning files and ATS for Orbit# 251. 
Please respond to this email thread with questions and approvals. 
Approvals are required before 16 June 14 @1800 UTC 

Note the following: 
1. Battery Balancing at Perigee 
ECT_SetLongEclipseFlag TRUE $TIME=2014/07:05:23:00:00 
ECT_SetLongEclipseFlag FALSE $TIME=2014/07:06:00:30:00 

2. Moon in Lo FOV 
Moon in LO FOV Commands 
# 2014-07-04T08:56:43.538Z,MoonInLoFovStart,orbit:251 
# 2014-07-04T12:39:11.923Z,MoonInLoFovStop,orbit:251 
# 2014-07-04T14:55:38.908Z,MoonInLoFovStart,orbit:251 
# 2014-07-05T05:59:15.482Z,MoonInLoFovStop,orbit:251 

3. New Payload Voltage settings 
Special Ops/Post-LUT Changes 
# CCB Description 
# 2013-05-15 Hi negative collimator voltage set to 1400 
# 2014-05-28 Hi CEMs A-C set to 1780, CEM D set to 1900 

4. Command Load Constraint Violation Report (CCVR) 
# IBEX_2014_177_o0251a_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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