[Isocops] IBEX Orbit# 256 ATS (11 Aug 14 - 20 Aug 14) - v001 approval

Fri Aug 1 20:10:44 EDT 2014

All, 

I have looked at the orbit 256 ATS, 

IBEX_2014_223_o0256a_v001.scr, 

and I approve. 

There are no constraint violations in 

IBEX_2014_223_o0256a_v001.ccvr. 

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

IBEX_2014_223_o0256a_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_223_o0256a_v001.oef, 

and as verified with ibex_orbit. 

There is one star tracker outage. It starts about 1 1/2 hours before perigee and ends about 5 hours later. No despinning should be required due to this outage. 

There is one moon in Lo FOV session in arc A. The ATS start time is about 1 1/2 hours after that in the OEF and the ATS end time is about three hours after 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_Orbit256Contacts.txt, 

for all contacts (4). 

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 255 left us pointing in safe directions for the orbit 256 arc A ascending and descending sequences: 

ibex_rotate -o -u -0.72006,0.640536,0.266885 -w ibex-sun -t 2014/08:11:18:09:23 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.720060,+0.640536,+0.266885 

which is R.A. +138.345 Decl. +15.479 

missing R.A. +141.187 Decl. +15.194 (ibex-sun) 

error is R.A. +2.842 Decl. +0.285 

for a total 2.755 deg 

ibex_rotate -o -u -0.72006,0.640536,0.266885 -w ibex-sun -t 2014/08:15:05:27:18 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.720060,+0.640536,+0.266885 

which is R.A. +138.345 Decl. +15.479 

missing R.A. +144.459 Decl. +14.108 (ibex-sun) 

error is R.A. +6.114 Decl. +1.371 

for a total 6.068 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 -0.7687,0.590783,0.245104 -w ibex-sun -t 2014/08:15:07:10:26 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.768700,+0.590783,+0.245104 

which is R.A. +142.456 Decl. +14.188 

missing R.A. +144.528 Decl. +14.085 (ibex-sun) 

error is R.A. +2.072 Decl. +0.103 

for a total 2.012 deg 

ibex_rotate -o -u -0.7687,0.590783,0.245104 -w ibex-sun -t 2014/08:15:08:45:32 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.768700,+0.590783,+0.245104 

which is R.A. +142.456 Decl. +14.188 

missing R.A. +144.591 Decl. +14.065 (ibex-sun) 

error is R.A. +2.135 Decl. +0.123 

for a total 2.074 deg 

ibex_rotate -o -u -0.7687,0.590783,0.245104 -w ibex-sun -t 2014/08:19:15:51:57 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.768700,+0.590783,+0.245104 

which is R.A. +142.456 Decl. +14.188 

missing R.A. +148.664 Decl. +12.712 (ibex-sun) 

error is R.A. +6.208 Decl. +1.476 

for a total 6.215 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 257 apogee: 

ibex_rotate -o -u -0.814998,0.535516,0.221361 -w ibex-sun -t 2014/08:19:17:53:02 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.814998,+0.535516,+0.221361 

which is R.A. +146.692 Decl. +12.789 

missing R.A. +148.740 Decl. +12.687 (ibex-sun) 

error is R.A. +2.048 Decl. +0.102 

for a total 2.000 deg 

ibex_rotate -o -u -0.814998,0.535516,0.221361 -w ibex-sun -t 2014-08-24T16:06:52.412Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.814998,+0.535516,+0.221361 

which is R.A. +146.692 Decl. +12.789 

missing R.A. +153.213 Decl. +11.020 (ibex-sun) 

error is R.A. +6.521 Decl. +1.769 

for a total 6.621 deg 

No Lo O-mode. 

There is no overlap with orbit 255 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: Monday, July 28, 2014 1:15:15 PM 
Subject: IBEX Orbit# 256 ATS (11 Aug 14 - 20 Aug 14) 

Guys, 
Here are the planning files and ATS for Orbit# 256. Please respond to this email thread with comments and approvals. 
Approvals are required before 31 July 14 @ 1200 UTC 

Note the following: 
1. Battery Balancing Commands at PERIGEE 
ECT_SetLongEclipseFlag TRUE $TIME=2014/08:20:01:00:00 
ECT_SetLongEclipseFlag FALSE $TIME=2014/08:20:02:30:00 

2. Moon in LO FOV Commands 
2014-08-13T13:17:44.448Z,MoonInLoFovStart,orbit:256 
2014-08-14T09:21:34.181Z,MoonInLoFovStop,orbit:256 

3.Special Ops/Post-LUT Changes 
Hi negative collimator voltage set to 1400 
Hi CEMs A-C set to 1780, CEM D set to 1900 

4. Command Load Constraint Violation Report (CCVR) 
IBEX_2014_223_o0256a_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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