[Isocops] IBEX Orbit# 278 ATS v003 Approval (27 Feb 15 - 8 Mar 15) - v003 approval

Sun Feb 15 19:55:52 EST 2015

All, 

I have looked at the orbit 278 ATS, 

IBEX_2015_058_o0278a_v003.scr, 

and I approve. 

The constraint violation in 

IBEX_2015_058_o0278a_v003.ccvr 

is related to the eclipse and isn't a problem. 

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

IBEX_2015_058_o0278a_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_058_o0278a_v003.oef, 

and as verified with ibex_orbit. 

There are two star tracker outages but one runs concurrently with the other. The longer outage starts about 8 hours after apogee and runs for 3+ days. Some despinning may be required due to this outage. 

There are no moon in Lo FOV sessions. 

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

IBEX_Orbit278Contacts.txt, 

for all contacts (3). 

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

The inertial maneuver at perigee of orbit 277 left us pointing in safe directions for the orbit 278 arc A ascending and descending sequences: 

ibex_rotate -o -u 0.934137,-0.351249,-0.063348 -w ibex-sun -t 2015/02:27:20:50:25 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.934137,-0.351249,-0.063348 

which is R.A. +339.393 Decl. -3.632 

missing R.A. +340.377 Decl. -8.293 (ibex-sun) 

error is R.A. +0.984 Decl. +4.661 

for a total 4.763 deg 

ibex_rotate -o -u 0.934137,-0.351249,-0.063348 -w ibex-sun -t 2015/03:03:11:59:59 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.934137,-0.351249,-0.063348 

which is R.A. +339.393 Decl. -3.632 

missing R.A. +343.822 Decl. -6.925 (ibex-sun) 

error is R.A. +4.429 Decl. +3.293 

for a total 5.503 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 0.956646,-0.288956,-0.036504 -w ibex-sun -t 2015/03:03:13:43:07 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.956646,-0.288956,-0.036504 

which is R.A. +343.193 Decl. -2.092 

missing R.A. +343.888 Decl. -6.898 (ibex-sun) 

error is R.A. +0.695 Decl. +4.806 

for a total 4.855 deg 

ibex_rotate -o -u 0.956646,-0.288956,-0.036504 -w ibex-sun -t 2015/03:03:15:18:13 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.956646,-0.288956,-0.036504 

which is R.A. +343.193 Decl. -2.092 

missing R.A. +343.948 Decl. -6.872 (ibex-sun) 

error is R.A. +0.755 Decl. +4.780 

for a total 4.839 deg 

ibex_rotate -o -u 0.956646,-0.288956,-0.036504 -w ibex-sun -t 2015/03:08:02:53:09 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.956646,-0.288956,-0.036504 

which is R.A. +343.193 Decl. -2.092 

missing R.A. +348.006 Decl. -5.135 (ibex-sun) 

error is R.A. +4.813 Decl. +3.043 

for a total 5.686 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 279 apogee: 

ibex_rotate -o -u 0.977862,-0.209243,-0.001815 -w ibex-sun -t 2015/03:08:05:14:20 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.977862,-0.209243,-0.001815 

which is R.A. +347.922 Decl. -0.104 

missing R.A. +348.098 Decl. -5.096 (ibex-sun) 

error is R.A. +0.176 Decl. +4.992 

for a total 4.995 deg 

ibex_rotate -o -u 0.977862,-0.209243,-0.001815 -w ibex-sun -t 2015-03-13T03:13:55.451Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.977862,-0.209243,-0.001815 

which is R.A. +347.922 Decl. -0.104 

missing R.A. +352.740 Decl. -3.170 (ibex-sun) 

error is R.A. +4.818 Decl. +3.066 

for a total 5.709 deg 

Lo O-mode in all of arc A (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 277 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" <robert.lockwood at orbitalatk.com>, "ryan tyler" <ryan.tyler at orbitalatk.com>, "tim perry" <tim.perry at orbitalatk.com>, "sheral wesley" <sheral.wesley at orbitalatk.com> 
Sent: Saturday, February 14, 2015 12:51:24 AM 
Subject: IBEX Orbit# 278 ATS v003 Approval (27 Feb 15 - 8 Mar 15) 

Guys, 
Here are the planning files and ATS for Orbit# 278. Please respond to this email thread with your comments and approvals. Approvals are required before 17 Feb 15 @ 1400 UTC 
Please note the following: 
1. Moderate Eclipse at PERIGEE 
Orbit# 278 PERIGEE: Moderate Eclipse Commands 

# 2015-03-08T18:30:10.907Z,PenumbraEntry,orbit:278 
# 2015-03-08T18:30:10.907Z,EclipseEntry,moderate:true,long:false,orbit:278 
ECT_SetLongEclipseFlag TRUE $TIME=2015/03:08:16:35:00 
ECT_SetLongEclipseFlag FALSE $TIME=2015/03:08:19:30:00 

# cells should be ~3.9V at end of eclipse 
# 2015-03-08T19:30:18.057Z,PenumbraExit,orbit:278 
# 2015-03-08T19:30:18.057Z,EclipseExit,moderate:true,long:false,orbit:278 
2. APOGEE Sun Maneuver 
3. Command Load Constraint Violation Report 
IBEX_2015_058_o0278a_v003.scr 
========================== 
HARD CONSTRAINT VIOLATIONS 
========================== 
NO VIOLATIONS. 
========================== 
SOFT CONSTRAINT VIOLATIONS 
========================== 
IBX-CLC-015: Battery charge falls below minimum from 2015/03/08 19:24:10 UTC - 
2015/03/08 19:42:18 UTC. Lowest charge level is 7737.193583 
watt-minutes during this interval. 
# – Set to TRUE at 16:35:00 (2 hours prior to start of eclipse) 
# – Set to FALSE at 19:30:00 (cells should be ~3.9V at end of eclipse) 
============== 
OTHER MESSAGES 
============== 
NO MESSAGES. 

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

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