[Isocops] IBEX Orbit# 277 ATS (18 Feb 15 - 27 Feb 15) - v001 approval

Thu Feb 5 19:29:35 EST 2015

All, 

I have looked at the orbit 277 ATS, 

IBEX_2015_049_o0277a_v001.scr, 

and I approve. 

There are no constraint violations in 

IBEX_2015_049_o0277a_v001.ccvr. 

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

IBEX_2015_049_o0277a_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_049_o0277a_v001.oef, 

and as verified with ibex_orbit. 

There is one star tracker outage. It starts two hours before apogee and runs for 3+ days. Some despinning may be required due to this outage. 

There is one moon in Lo FOV session. It starts in arc A and completes in arc B. The ATS start time is about four hours after that in the OEF and the ATS end time is about 7 1/2 hours before 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_Orbit277Contacts.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 276 left us pointing in safe directions for the orbit 277 arc A ascending and descending sequences: 

ibex_rotate -o -u 0.866924,-0.483595,-0.120743 -w ibex-sun -t 2015/02:18:18:30:27 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.866924,-0.483595,-0.120743 

which is R.A. +330.846 Decl. -6.935 

missing R.A. +331.713 Decl. -11.619 (ibex-sun) 

error is R.A. +0.867 Decl. +4.684 

for a total 4.761 deg 

ibex_rotate -o -u 0.866924,-0.483595,-0.120743 -w ibex-sun -t 2015/02:22:08:10:55 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.866924,-0.483595,-0.120743 

which is R.A. +330.846 Decl. -6.935 

missing R.A. +335.165 Decl. -10.357 (ibex-sun) 

error is R.A. +4.319 Decl. +3.422 

for a total 5.471 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 0.899511,-0.426215,-0.096019 -w ibex-sun -t 2015/02:22:09:54:03 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.899511,-0.426215,-0.096019 

which is R.A. +334.647 Decl. -5.510 

missing R.A. +335.232 Decl. -10.331 (ibex-sun) 

error is R.A. +0.585 Decl. +4.821 

for a total 4.856 deg 

ibex_rotate -o -u 0.899511,-0.426215,-0.096019 -w ibex-sun -t 2015/02:22:11:29:09 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.899511,-0.426215,-0.096019 

which is R.A. +334.647 Decl. -5.510 

missing R.A. +335.294 Decl. -10.307 (ibex-sun) 

error is R.A. +0.647 Decl. +4.797 

for a total 4.840 deg 

ibex_rotate -o -u 0.899511,-0.426215,-0.096019 -w ibex-sun -t 2015/02:26:21:06:49 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.899511,-0.426215,-0.096019 

which is R.A. +334.647 Decl. -5.510 

missing R.A. +339.377 Decl. -8.670 (ibex-sun) 

error is R.A. +4.730 Decl. +3.160 

for a total 5.658 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 278 apogee: 

ibex_rotate -o -u 0.934137,-0.351249,-0.063348 -w ibex-sun -t 2015/02:26:23:21:32 

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. +339.466 Decl. -8.634 (ibex-sun) 

error is R.A. +0.073 Decl. +5.002 

for a total 5.003 deg 

ibex_rotate -o -u 0.934137,-0.351249,-0.063348 -w ibex-sun -t 2015-03-03T23:29:05.228Z 

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. +344.261 Decl. -6.742 (ibex-sun) 

error is R.A. +4.868 Decl. +3.110 

for a total 5.759 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 276 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: Wednesday, February 4, 2015 2:16:17 PM 
Subject: IBEX Orbit# 277 ATS (18 Feb 15 - 27 Feb 15) 

Guys, 
Here are the planning files and ATS for Orbit# 277. Please respond to this email thread with your comments and approvals. 
Approvals are required before 7 Feb 15 @1200 UTC. 
Note the following: 
1. Battery Balancing at Perigee 
2015-02-27T09:00:44.792Z,Perigee,orbit:277 
Orbit# 277 PERIGEE: Battery Balancing Commands 
SetLongEclipseFlag TRUE $TIME=2015/02:27:08:00:00 
SetLongEclipseFlag FALSE $TIME=2015/02:27:09:30:00 
2. IBEX Moon far in Lo FOV Commands 
2015-02-21T13:08:23.195Z,MoonInLoFovStart,orbit:277 
2015-02-22T21:23:11.888Z,MoonInLoFovStop,orbit:277 
3. Payload O-Mode Commands 
2014-09-24 Lo O-mode (cross calibration) 
4. Command Load Constraint Violation Report (CCVR) 
IBEX_2015_049_o0277a_v001.scr 
========================== 
HARD CONSTRAINT VIOLATIONS 
========================== 
NO VIOLATIONS. 
========================== 
SOFT CONSTRAINT VIOLATIONS 
========================== 
NO VIOLATIONS. 
============== 
OTHER MESSAGES 
============== 
NO MESSAGES. 

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

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