[Isocops] IBEX Orbit# 272 ATS (2 Jan 15 - 12 Jan 15) - v001 approval

Tue Dec 23 19:08:19 EST 2014

All, 

I have looked at the orbit 272 ATS, 

IBEX_2015_002_o0272a_v001.scr, 

and I approve. 

There are no constraint violations in 

IBEX_2015_002_o0272a_v001.ccvr. 

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

IBEX_2015_002_o0272a_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_2015_002_o0272a_v001.oef, 

and as verified with ibex_orbit. 

There is one star tracker outage. The outage starts about 14 1/2 hours after 15 Re ascending and runs for over 3 days (thus delaying the apogee maneuver). Some despinning may be required due to these outages. 

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

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

IBEX_Orbit272Contacts.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 inertial maneuver at perigee of orbit 271 left us pointing in safe directions for the orbit 272 arc A ascending and descending sequences: 

ibex_rotate -o -u 0.229904,-0.922231,-0.310859 -w ibex-sun -t 2015/01:03:09:44:05 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.229904,-0.922231,-0.310859 

which is R.A. +283.998 Decl. -18.111 

missing R.A. +283.600 Decl. -22.855 (ibex-sun) 

error is R.A. +0.398 Decl. +4.744 

for a total 4.758 deg 

ibex_rotate -o -u 0.229904,-0.922231,-0.310859 -w ibex-sun -t 2015/01:07:15:04:45 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.229904,-0.922231,-0.310859 

which is R.A. +283.998 Decl. -18.111 

missing R.A. +288.147 Decl. -22.424 (ibex-sun) 

error is R.A. +4.149 Decl. +4.313 

for a total 5.808 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 0.300288,-0.904331,-0.303335 -w ibex-sun -t 2015/01:07:16:47:32 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.300288,-0.904331,-0.303335 

which is R.A. +288.369 Decl. -17.658 

missing R.A. +288.224 Decl. -22.414 (ibex-sun) 

error is R.A. +0.145 Decl. +4.756 

for a total 4.758 deg 

ibex_rotate -o -u 0.300288,-0.904331,-0.303335 -w ibex-sun -t 2015/01:07:18:22:59 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.300288,-0.904331,-0.303335 

which is R.A. +288.369 Decl. -17.658 

missing R.A. +288.295 Decl. -22.406 (ibex-sun) 

error is R.A. +0.074 Decl. +4.748 

for a total 4.748 deg 

ibex_rotate -o -u 0.300288,-0.904331,-0.303335 -w ibex-sun -t 2015/01:11:20:06:02 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.300288,-0.904331,-0.303335 

which is R.A. +288.369 Decl. -17.658 

missing R.A. +292.736 Decl. -21.783 (ibex-sun) 

error is R.A. +4.367 Decl. +4.125 

for a total 5.822 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 273 apogee: 

ibex_rotate -o -u 0.388285,-0.874648,-0.290218 -w ibex-sun -t 2015/01:11:22:20:17 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.388285,-0.874648,-0.290218 

which is R.A. +293.938 Decl. -16.871 

missing R.A. +292.844 Decl. -21.766 (ibex-sun) 

error is R.A. +1.094 Decl. +4.895 

for a total 5.003 deg 

ibex_rotate -o -u 0.388285,-0.874648,-0.290218 -w ibex-sun -t 2015-01-16T22:53:24.231Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.388285,-0.874648,-0.290218 

which is R.A. +293.938 Decl. -16.871 

missing R.A. +298.265 Decl. -20.932 (ibex-sun) 

error is R.A. +4.327 Decl. +4.061 

for a total 5.766 deg 

Lo O-mode in all of arc B ( plan 6,7,1,1). There is more than 1 hour between the end of the ascending sequence and the start of O-mode and also more than an hour after O-mode ends and the start of the descending sequence. 

There is no overlap with orbit 271 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, December 22, 2014 12:22:42 AM 
Subject: IBEX Orbit# 272 ATS (2 Jan 15 - 12 Jan 15) 

Guys, 
Here are the planning files and ATS for Orbit# 272. Please respond to this email thread with your comments and approvals. 
Approvals are required before 24 Dec 14 @0000 UTC. 
Note the following: 
1. IBEX_Lo Cross Calibration 
CEU_LO_SCIENCE_MODE OXYGEN 
2. Moon in Lo FOV 
# 2015-01-11T17:14:15.068Z,MoonInLoFovStart,orbit:272 
# 2015-01-11T18:39:43.675Z,MoonInLoFovStop,orbit:272 
3. Battery Balancing at PERIGEE 
SetLongEclipseFlag TRUE $TIME=2015/01:12:07:00:00 
SetLongEclipseFlag FALSE $TIME=2015/01:12:08:30:00 
4. Command Load Constraint Violation Report 
IBEX_2015_002_o0272a_v001.scr 
========================== 
HARD CONSTRAINT VIOLATIONS 
========================== 
NO VIOLATIONS. 
========================== 
SOFT CONSTRAINT VIOLATIONS 
========================== 
============== 
OTHER MESSAGES 
============== 
NO MESSAGES. 

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

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