[Isocops] IBEX Orbit# 224 ATS v002 (23 Oct 13 - 1 Nov 13) - v002 approval

Sun Oct 13 01:45:31 EDT 2013

All, 

I have looked at the orbit 224 ATS, 

IBEX_2013_296_o0224a_v002.scr, 

and I approve. 

The constraint violations in 

IBEX_2013_296_o0224a_v001.ccvr 

are all eclipse related. It looks like two of the violations are related to commands generated in the v001 ATS. The remaining one is a warning about the battery charge during the eclipse. 

The PL commands in the v002 ATS match those in the v003 STF, 

IBEX_2013_296_o0224a_v003.stf. 

Ascending and descending command sequences are consistent with each other and 15 Re ascending, the apogee maneuver time and the eclipse as determined from the OEF, 

IBEX_2013_296_o0224a_v001.oef, 

and as verified with ibex_orbit. 

There are two star tracker outages. The first starts about 4.5 hours after the orbit 223 perigee and ends about 4.5 hours after 15 Re ascending. The second starts about 6 hours after the orbit 224 perigee and ends about 4 hours later. The first part of arc A may need despinning because of the first outage. 

There is one moon in Lo FOV session in arc A. The ATS start time is about 10 hours after that in the OEF and the end time is about 5 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_Orbit224Contacts.txt, 

for all contacts (5). There is also a backup contact in the contacts file. The commands for this contact do not appear in the ATS because it will only be used if one of the other contacts has to be cancelled because of LEOPS activity. 

The LE flag is set before the eclipse and reset after the eclipse. These commands are offset by enough time from other commands. 

The inertial maneuver at perigee of orbit 223 left us pointing in safe directions for orbit 224 arc A ascending and descending sequences: 

ibex_rotate -o -u -0.885974,-0.421412,-0.193549 -w ibex-sun -t 2013/10:23:23:50:43 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.885974,-0.421412,-0.193549 
which is R.A. +205.438 Decl. -11.160 
missing R.A. +208.425 Decl. -11.660 (ibex-sun) 
error is R.A. +2.987 Decl. +0.500 
for a total 2.970 deg 

ibex_rotate -o -u -0.885974,-0.421412,-0.193549 -w ibex-sun -t 2013/10:27:18:12:25 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.885974,-0.421412,-0.193549 
which is R.A. +205.438 Decl. -11.160 
missing R.A. +211.922 Decl. -12.947 (ibex-sun) 
error is R.A. +6.484 Decl. +1.787 
for a total 6.587 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 -0.845249,-0.486197,-0.221736 -w ibex-sun -t 2013/10:27:19:55:33 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.845249,-0.486197,-0.221736 
which is R.A. +209.908 Decl. -12.811 
missing R.A. +211.991 Decl. -12.971 (ibex-sun) 
error is R.A. +2.083 Decl. +0.160 
for a total 2.037 deg 

ibex_rotate -o -u -0.845249,-0.486197,-0.221736 -w ibex-sun -t 2013/10:27:21:30:39 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.845249,-0.486197,-0.221736 
which is R.A. +209.908 Decl. -12.811 
missing R.A. +212.055 Decl. -12.993 (ibex-sun) 
error is R.A. +2.147 Decl. +0.182 
for a total 2.100 deg 

ibex_rotate -o -u -0.845249,-0.486197,-0.221736 -w ibex-sun -t 2013/10:31:21:20:00 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.845249,-0.486197,-0.221736 
which is R.A. +209.908 Decl. -12.811 
missing R.A. +216.036 Decl. -14.311 (ibex-sun) 
error is R.A. +6.128 Decl. +1.500 
for a total 6.143 deg 

(early descent due to eclipse) 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 225 apogee: 

ibex_rotate -o -u -0.798028,-0.548859,-0.248808 -w ibex-sun -t 2013/11:01:14:27:03 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.798028,-0.548859,-0.248808 
which is R.A. +214.519 Decl. -14.407 
missing R.A. +216.770 Decl. -14.540 (ibex-sun) 
error is R.A. +2.251 Decl. +0.133 
for a total 2.184 deg 

ibex_rotate -o -u -0.798028,-0.548859,-0.248808 -w ibex-sun -t 2013-11-06T14:27:22.016Z 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.798028,-0.548859,-0.248808 
which is R.A. +214.519 Decl. -14.407 
missing R.A. +221.571 Decl. -16.083 (ibex-sun) 
error is R.A. +7.052 Decl. +1.676 
for a total 7.006 deg 

No Lo O-mode. 

There is no overlap with orbit 223 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: joe at boulder.swri.edu, "IBEX-FDG" <IBEX.fdg at applieddefense.com>, "IBEXOPS/ORB" <IBEXops at orbital.com>, "ISOC at New Hampshire" <isocops at lists.sr.unh.edu>, "John Cavallo" <cavallo.john at orbital.com>, "Ken Fairchild" <fair-play at comcast.net>, "Mark Tapley" <mtapley at swri.edu>, "Nigel Angold" <ngangold at earthlink.net>, "Robert Lockwood" <Lockwood.Robert at orbital.com>, "Roland Vanderspek" <roland at space.mit.edu>, "Ryan Tyler" <tyler.ryan at orbital.com>, "Sheral Wesley" <wesley.sheral at orbital.com>, "Thomas Regiec" <regiec.thomas at orbital.com>, "Tim Perry" <perry.tim at orbital.com> 
Sent: Friday, October 11, 2013 4:30:19 PM 
Subject: IBEX Orbit# 224 ATS v002 (23 Oct 13 - 1 Nov 13) 

Guys, 
I have enclosed v002 of the Orbit# 224 ATS. 
The MPS generated eclipse commands have been removed 
Please respond to this email thread with all questions and comments. 
All questions, comments and approvals are required before 13 Oct 13 @1800 UTC 

On Fri, Oct 11, 2013 at 12:52 AM, Ibex Mission Operations < ibexops at gmail.com > wrote: 

Guys, 
Here are the planning files and ATS for Orbit# 224. 
Please respond to this email thread with all questions and comments. 
All questions, comments and approvals are required before 13 Oct 13 @1800 UTC 

Please note the following: 

1. Long Eclipse during this Orbit 
Minimum voltage expected is 3.51 with the Long Eclipse Flag Set 
# Orbit# 224 APOGEE: Eclipse Start and Stop 
#2013-11-01T01:52:02.902Z,PenumbraEntry,orbit:224 
#2013-11-01T01:52:02.902Z,EclipseEntry,orbit:224,moderate:false,long:true 
#2013-11-01T04:23:10.866Z,PenumbraExit,orbit:224 
#2013-11-01T04:23:10.866Z,EclipseExit,orbit:224,moderate:false,long:true 
2. Payload on and Ascending Commands are commented out, Post-Eclipse 
3. Command Load Constraint Violation Report (CCVR) 
# IBEX_2013_296_o0224a_v001.scr 
========================== 
HARD CONSTRAINT VIOLATIONS 
========================== 
NO VIOLATIONS. 
========================== 
SOFT CONSTRAINT VIOLATIONS 
========================== 
IBX-CLC-003: Payload mode is HVSCI during interval 2013/11/01 14:17:03 UTC - 
2013/11/01 14:27:03 UTC, which overlaps 5N thruster maneuver at 
2013/11/01 14:17:03 UTC - 2013/11/01 14:27:03 UTC 
* Payload Mode commands are commented out of the ATS (Post Eclipse) 

IBX-CLC-008: Spacecraft state is HK during interval 2013/11/01 13:18:54 UTC - 
2013/11/02 09:30:00 UTC, which overlaps HVSCI payload mode at 
2013/11/01 09:51:10 UTC - 2013/11/02 09:30:00 UTC 
*HVSCI Commands are commented out of the ATS (Post Eclipse) 

IBX-CLC-015: Battery charge falls below minimum from 2013/11/01 04:18:02 UTC - 
2013/11/01 04:26:10 UTC. Lowest charge level is 902.610476 
watt-minutes during this interval. 
* The Long Eclipse FLAG will be set 
# Orbit# 224 APOGEE: Set Long Eclipse Flag 
@ECT_SetLongEclipseFlag TRUE $TIME=2013/10:31:13:52:22 
@ECT_SetLongEclipseFlag FALSE $TIME=2013/11:01:09:13:10 

============== 
OTHER MESSAGES 
============== 
NO MESSAGES. 

-- 

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

-- 

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