[Isocops] IBEX Orbit# 253 ATS (15 Jul 14 - 24 Jul 14) - v001 approval

Thu Jul 3 17:49:27 EDT 2014

All, 

I have looked at the orbit 253 ATS, 

IBEX_2014_196_o0253a_v001.scr, 

and I approve. 

There are no constraint violations in 

IBEX_2014_196_o0253a_v001.ccvr. 

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

IBEX_2014_196_o0253a_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_196_o0253a_v001.oef, 

and as verified with ibex_orbit. 

There is one star tracker outage. It starts about 1 hour after 10 Re descending and ends about 4 3/4 hours later. No despinning should be required due to this outage as we'll have descended before it starts. 

There is one moon in Lo FOV session in arc A. The ATS start time is about 4 1/2 hours after that in the OEF and the ATS end time is 2+ hours after that 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_Orbit253Contacts.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 252 left us pointing in safe directions for the orbit 253 arc A ascending and descending sequences: 

ibex_rotate -o -u -0.34437,0.865275,0.364292 -w ibex-sun -t 2014/07:15:14:20:44 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.344370,+0.865275,+0.364292 

which is R.A. +111.702 Decl. +21.364 

missing R.A. +114.606 Decl. +21.506 (ibex-sun) 

error is R.A. +2.904 Decl. +0.142 

for a total 2.707 deg 

ibex_rotate -o -u -0.34437,0.865275,0.364292 -w ibex-sun -t 2014/07:19:03:25:38 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.344370,+0.865275,+0.364292 

which is R.A. +111.702 Decl. +21.364 

missing R.A. +118.234 Decl. +20.869 (ibex-sun) 

error is R.A. +6.532 Decl. +0.495 

for a total 6.113 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 -0.412521,0.839758,0.353034 -w ibex-sun -t 2014/07:19:05:08:46 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.412521,+0.839758,+0.353034 

which is R.A. +116.162 Decl. +20.673 

missing R.A. +118.308 Decl. +20.856 (ibex-sun) 

error is R.A. +2.145 Decl. +0.183 

for a total 2.014 deg 

ibex_rotate -o -u -0.412521,0.839758,0.353034 -w ibex-sun -t 2014/07:19:06:43:52 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.412521,+0.839758,+0.353034 

which is R.A. +116.162 Decl. +20.673 

missing R.A. +118.375 Decl. +20.844 (ibex-sun) 

error is R.A. +2.213 Decl. +0.171 

for a total 2.077 deg 

ibex_rotate -o -u -0.412521,0.839758,0.353034 -w ibex-sun -t 2014/07:23:15:02:19 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.412521,+0.839758,+0.353034 

which is R.A. +116.162 Decl. +20.673 

missing R.A. +122.731 Decl. +20.042 (ibex-sun) 

error is R.A. +6.569 Decl. +0.631 

for a total 6.191 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 254 apogee: 

ibex_rotate -o -u -0.480849,0.808363,0.339608 -w ibex-sun -t 2014/07:23:17:06:19 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.480849,+0.808363,+0.339608 

which is R.A. +120.746 Decl. +19.853 

missing R.A. +122.812 Decl. +20.027 (ibex-sun) 

error is R.A. +2.066 Decl. +0.174 

for a total 1.950 deg 

ibex_rotate -o -u -0.480849,0.808363,0.339608 -w ibex-sun -t 2014-07-28T16:57:15.356Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.480849,+0.808363,+0.339608 

which is R.A. +120.746 Decl. +19.853 

missing R.A. +127.715 Decl. +18.895 (ibex-sun) 

error is R.A. +6.969 Decl. +0.958 

for a total 6.644 deg 

No Lo O-mode. 

There is no overlap with orbit 252 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: Tuesday, July 1, 2014 1:24:32 PM 
Subject: IBEX Orbit# 253 ATS (15 Jul 14 - 24 Jul 14) 

Guys, 
Here are the planning files and ATS for Orbit# 253. 
Please respond to this email thread with your questions and approvals. 
Approvals are required before 4 July 14 @ 1400 UTC 

Note the following: 
1. Battery Balancing Commands at Perigee 
Orbit# 253 PERIGEE: Battery Balancing Commands 
SetLongEclipseFlag TRUE $TIME=2014/07:24:03:00:00 
SetLongEclipseFlag FALSE $TIME=2014/07:24:04:30:00 

2. Moon in Lo FOV 
Orbit# 253 APOGEE: Moon in Lo FOV Commands 
2014-07-16T07:09:44.389Z,MoonInLoFovStart,orbit:253 
2014-07-16T22:04:37.738Z,MoonInLoFovStop,orbit:253 

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 

-- 

Sheral R. Wesley 
SPVR., Satellite Operations 
IBEX Mission OPS 
CYGNUS Mission Planning 
(304) 279-6678 
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