[Isocops] IBEX Orbit# 280 ATS (17 Mar 15 - 26 Mar 15) - v001 approval (full email)

Ken Fairchild fair-play at comcast.net
Sun Mar 8 23:20:09 EDT 2015


All, 

This is my full email for the orbit 280 ATS approval. 

I have looked at the orbit 280 ATS, 



IBEX_2015_076_o0280a_v001.scr, 




and I approve. 




The constraint violations in 




IBEX_2015_076_o0280a_v001.ccvr 




are related to the eclipses in orbit 279 and this orbit and aren't problems. 




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




IBEX_2015_076_o0280a_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_2015_076_o0280a_v001.oef, 




and as verified with ibex_orbit. 




There is one star tracker outage. The outage starts 2- days after apogee and runs for almost 2 days. Some despinning may be required due to this outage. 




There are two moon in Lo FOV sessions in arc B. The ATS start time for the first one is almost 2 hours after that in the OEF and the ATS end time is 8 1/2 hours before that in the OEF. The ATS start time for the second session is 4 1/2 hours after that in the OEF and the ATS end time is the same as that in the OEF. The time differences are not unusual. 




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




IBEX_Orbit280Contacts.txt, 




for all contacts (3). 




The LE flag is set because of the eclipse. The command start and end times match Ryan's recommendations. 




The inertial maneuver at perigee of orbit 279 left us pointing in safe directions for the orbit 280 arc A ascending and descending sequences: 




ibex_rotate -o -u 0.998022,-0.056287,-0.027991 -w ibex-sun -t 2015/03:18:03:43:46 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.998022,-0.056287,-0.027991 

which is R.A. +356.772 Decl. -1.604 

missing R.A. +357.283 Decl. -1.187 (ibex-sun) 

error is R.A. +0.511 Decl. +0.417 

for a total 0.659 deg 




ibex_rotate -o -u 0.998022,-0.056287,-0.027991 -w ibex-sun -t 2015/03:21:15:48:51 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.998022,-0.056287,-0.027991 

which is R.A. +356.772 Decl. -1.604 

missing R.A. +0.552 Decl. +0.202 (ibex-sun) 

error is R.A. +356.220 Decl. +1.806 

for a total 4.189 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 0.99968,-0.017223,-0.018552 -w ibex-sun -t 2015/03:21:17:31:59 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.999680,-0.017223,-0.018552 

which is R.A. +359.013 Decl. -1.063 

missing R.A. +0.617 Decl. +0.230 (ibex-sun) 

error is R.A. +358.396 Decl. +1.293 

for a total 2.060 deg 




ibex_rotate -o -u 0.99968,-0.017223,-0.018552 -w ibex-sun -t 2015/03:21:19:07:05 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.999680,-0.017223,-0.018552 

which is R.A. +359.013 Decl. -1.063 

missing R.A. +0.676 Decl. +0.256 (ibex-sun) 

error is R.A. +358.337 Decl. +1.319 

for a total 2.123 deg 




ibex_rotate -o -u 0.99968,-0.017223,-0.018552 -w ibex-sun -t 2015/03:26:03:25:58 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.999680,-0.017223,-0.018552 

which is R.A. +359.013 Decl. -1.063 

missing R.A. +4.515 Decl. +1.967 (ibex-sun) 

error is R.A. +354.498 Decl. +3.030 

for a total 6.280 deg 




The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 281 apogee: 




ibex_rotate -o -u 0.998488,0.053534,0.012496 -w ibex-sun -t 2015/03:26:05:39:59 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.998488,+0.053534,+0.012496 

which is R.A. +3.069 Decl. +0.716 

missing R.A. +4.597 Decl. +2.003 (ibex-sun) 

error is R.A. +1.529 Decl. +1.287 

for a total 1.998 deg 




ibex_rotate -o -u 0.998488,0.053534,0.012496 -w ibex-sun -t 2015-03-31T04:20:21.206Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.998488,+0.053534,+0.012496 

which is R.A. +3.069 Decl. +0.716 

missing R.A. +9.225 Decl. +3.941 (ibex-sun) 

error is R.A. +6.156 Decl. +3.225 

for a total 6.944 deg 




No Lo O-mode. 




There is no overlap with orbit 279 commands by manual inspection or by checking at 




http://ibex.unh.edu/cgi-bin/ats.cgi . 




Although I sent the Command Approval Checklist with my original email, I've attached it to this email as well. 




Ken 





----- Original Message -----

From: "Ibex Mission Operations" <ibexops at gmail.com> 
To: "David Heirtzler" <dheirtzl at atlas.sr.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" <robert.lockwood at orbitalatk.com>, "Ryan Tyler" <ryan.tyler at orbitalatk.com>, "Sheral Wesley" <sheral.wesley at orbitalatk.com>, "Tim Perry" <tim.perry at orbitalatk.com> 
Sent: Thursday, March 5, 2015 11:08:10 PM 
Subject: IBEX Orbit# 280 ATS (17 Mar 15 - 26 Mar 15) 

Guys, 
Here are the planniung files and ATS for Orbit# 280. 
Please respond to this thread with questions and approvals. 
Approvals are required before 7 Mar 15 @ 2300 UTC 
Please note the following: 
1. Moderate Eclipse 
Orbit# 280 PERIGEE: Moderate Eclipse Commands 
# 2015-03-26T21:38:40.188Z,PenumbraEntry,orbit:280 
# 2015-03-26T21:38:40.188Z,EclipseEntry,moderate:true,long:false,orbit:280 
ECT_SetLongEclipseFlag TRUE $TIME=2015/03:26:19:45:00 
ECT_SetLongEclipseFlag FALSE $TIME=2015/03:26:22:35:00 

# 2015-03-26T22:34:54.839Z,PenumbraExit,orbit:280 
# 2015-03-26T22:34:54.839Z,EclipseExit,moderate:true,long:false,orbit:280 
2. Moon in Lo FOV Commands 
# 2015-03-23T00:20:13.901Z,MoonInLoFovStart,orbit:280 
# 2015-03-24T20:35:21.514Z,MoonInLoFovStop,orbit:280 
# 2015-03-25T18:54:09.555Z,MoonInLoFovStart,orbit:280 
# 2015-03-26T01:59:04.527Z,MoonInLoFovStop,orbit:280 
3. Command Load Constraint Violation Report 
IBEX_2015_076_o0280a_v001.scr 
========================== 
HARD CONSTRAINT VIOLATIONS 
========================== 
NO VIOLATIONS. 
========================== 
SOFT CONSTRAINT VIOLATIONS 
========================== 
IBX-CLC-015: Battery charge falls below minimum from 2015/03/17 21:58:32 UTC - 
2015/03/17 23:06:32 UTC. Lowest charge level is 6077.658938 
watt-minutes during this interval. 
# Eclipse flag was set in ORbit# 279 ATS 
# ECT_SetLongEclipseFlag TRUE $TIME=2015/03:17:18:40:00 
# ECT_SetLongEclipseFlag FALSE $TIME=2015/03:17:22:00:00 
# Min voltage 3.76V with eclipse flag set 

IBX-CLC-015: Battery charge falls below minimum from 2015/03/26 22:32:40 UTC - 
2015/03/26 22:34:54 UTC. Lowest charge level is 8023.554852 
watt-minutes during this interval. 
# Eclipse Flag will be set in Orbit# 280 ATS 
# ECT_SetLongEclipseFlag TRUE $TIME=2015/03:26:19:45:00 
# ECT_SetLongEclipseFlag FALSE $TIME=2015/03:26:22:35:00 
# Min voltage 3.9V with eclipse flat set 
============== 
OTHER MESSAGES 
============== 
NO MESSAGES. 

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

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