[Isocops] IBEX Orbit# 393 ATS Approval (8 Jan 18 - 17 Jan 18) - v001 approval

Fri Dec 29 09:06:13 EST 2017

All, 

Note: Angle at orbit 393 arc B descending after the apogee sun precession maneuver: 4.007 deg 

I have looked at the orbit 393 ATS, 

IBEX_2018_008_o0393a_v001.scr, 

and I approve. 

The only constraint violations in 

IBEX_2018_008_o0393a_v001.ccvr 

are from the removal of the 

ACT_SetSpinPulseProtectEnable Enable 

commands (2); the violations are expected. 

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

IBEX_2018_008_o0393a_v002.stf. 

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

IBEX_2018_008_o0393a_v001.oef, 

and as verified with ibex_orbit. 

There is one star tracker outage. The outage starts 2- days before apogee and runs 4+ days. Some despinning may be required due to this outage. 

There are two moon in Lo FOV sessions. The first one is in arc A. The ATS start time is about the same as the OEF start time and the ATS end time is about 15 hours before that in the OEF. The second session starts in arc A and ends in arc B. The ATS start time is almost one day later than that in the OEF and the ATS end time is about 7 hours earlier than 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_Orbit393_Contacts.txt, 

for all contacts (3). 

There is an eclipse near perigee. The LE flag commands are correct, agree with Ryan's timing recommendations and are offset by enough time from other commands. 

The inertial maneuver at perigee of orbit 392 left us pointing in safe directions for the orbit 393 arc A ascending and descending sequences: 

ibex_rotate -o -u 0.247885,-0.885021,-0.39407 -w ibex-sun -t 2018/01:08:15:23:14 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.247885,-0.885021,-0.394070 

which is R.A. +285.647 Decl. -23.208 

missing R.A. +289.592 Decl. -22.239 (ibex-sun) 

error is R.A. +3.945 Decl. +0.969 

for a total 3.765 deg 

ibex_rotate -o -u 0.247885,-0.885021,-0.39407 -w ibex-sun -t 2018/01:12:13:53:48 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.247885,-0.885021,-0.394070 

which is R.A. +285.647 Decl. -23.208 

missing R.A. +293.840 Decl. -21.647 (ibex-sun) 

error is R.A. +8.193 Decl. +1.561 

for a total 7.731 deg 

The sun precession 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 -r +293.920 -d -21.634 -w ibex-sun -t 2018/01:12:15:41:56 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.376899,-0.849720,-0.368676 

which is R.A. +293.920 Decl. -21.634 

missing R.A. +293.920 Decl. -21.634 (ibex-sun) 

error is R.A. +0.000 Decl. +0.000 

for a total 0.000 deg 

ibex_rotate -o -r +293.920 -d -21.634 -w ibex-sun -t 2018/01:12:17:12:02 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.376899,-0.849720,-0.368676 

which is R.A. +293.920 Decl. -21.634 

missing R.A. +293.987 Decl. -21.623 (ibex-sun) 

error is R.A. +0.067 Decl. +0.011 

for a total 0.063 deg 

ibex_rotate -o -r +293.920 -d -21.634 -w ibex-sun -t 2018/01:16:14:49:38 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.376899,-0.849720,-0.368676 

which is R.A. +293.920 Decl. -21.634 

missing R.A. +298.145 Decl. -20.893 (ibex-sun) 

error is R.A. +4.225 Decl. +0.741 

for a total 4.007 deg 

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 394 apogee: 

ibex_rotate -o -u 0.398892,-0.837498,-0.373474 -w ibex-sun -t 2018/01:16:16:57:49 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.398892,-0.837498,-0.373474 

which is R.A. +295.468 Decl. -21.930 

missing R.A. +298.244 Decl. -20.878 (ibex-sun) 

error is R.A. +2.776 Decl. +1.052 

for a total 2.791 deg 

ibex_rotate -o -u 0.398892,-0.837498,-0.373474 -w ibex-sun -t 2018-01-21T13:25:24.399Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.398892,-0.837498,-0.373474 

which is R.A. +295.468 Decl. -21.930 

missing R.A. +303.462 Decl. -19.899 (ibex-sun) 

error is R.A. +7.994 Decl. +2.031 

for a total 7.737 deg 

No Lo O-mode. 

There is no overlap with orbit 392 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: "Sheral Wesley" <Sheral.Wesley at OrbitalATK.com> 
To: "Eric Chubin" <Eric.Chubin at OrbitalATK.com>, "Colin Joyce" <cjl46 at wildcats.unh.edu>, "David Heirtzler" <dheirtzl at atlas.sr.unh.edu>, "IBEX-FDG" <IBEX.fdg at applieddefense.com>, "IBEXOPS" <IBEXOPS at gmail.com>, "ISOC" <isocops at lists.sr.unh.edu>, "Ken Fairchild" <kwfairchild at gmail.com>, "Ken Fairchild" <fair-play at comcast.net>, "Robert Lockwood" <Robert.Lockwood at OrbitalATK.com>, "Nigel Angold" <nigel.angold at nasa.gov>, "Paul Janzen" <paul.janzen at umontana.edu>, "Timothy Perry" <Timothy.Perry at OrbitalATK.com>, "Ryan Tyler" <Ryan.Tyler at OrbitalATK.com>, "Sheral Wesley" <Sheral.Wesley at OrbitalATK.com> 
Sent: Wednesday, December 27, 2017 4:58:29 PM 
Subject: IBEX Orbit# 393 ATS Approval (8 Jan 18 - 17 Jan 18) 

Guys, 

Here are the planning files and ATS for Orbit# 393. 

Please respond to this email thread with your approvals and comments 

Approvals are required before 29 Dec 18 @1500 UTC 

Note the following: 

1. MODERATE Eclipse at Perigee 

Moderate Eclipse at PERIGEE 

ORbit# 393 PERIGEE: Moderate Eclipse Commands 

2018-01-17T02:52:30.552Z,Perigee,orbit:393 

2018-01-17T03:14:25.503Z,PenumbraEntry,orbit:393 

2018-01-17T03:14:25.503Z,EclipseEntry,moderate:true,long:false,orbit:393 

2018-01-17T04:14:47.710Z,PenumbraExit,orbit:393 

2018-01-17T04:14:47.710Z,EclipseExit,moderate:true,long:false,orbit:393 

SetLongEclipseFlag TRUE $TIME=2018/01:17:01:17:00 

SetLongEclipseFlag FALSE $TIME=2018/01:17:04:15:00 

2. Moon in Lo FOV Commands 

2018-01-08T16:52:33.983Z,MoonInLoFovStart,orbit:393 

2018-01-09T12:55:35.700Z,MoonInLoFovStop,orbit:393 

2018-01-11T07:52:50.894Z,MoonInLoFovStart,orbit:393 

2018-01-13T15:12:20.820Z,MoonInLoFovStop,orbit:393 

3. APOGEE Sun Maneuver 

2018-01-10T18:45:26.491Z,StarTrackerOutageStart,dueTo:earth,orbit:393 

2018-01-15T00:15:35.680Z,StarTrackerOutageStop,dueTo:earth,orbit:393 

Sheral R. Wesley 

Sr Systems Engineer 

IBEX , OCO2 Mission OPS 

CRS/CYGNUS Mission Planning 

Bldg. 2 Room 1337 

Office (703) 406-5641 

Cell (202) 236-0802 

Notice: This e-mail is intended solely for use of the individual or entity to which it is addressed and may contain information that is proprietary, privileged and/or exempt from disclosure under applicable law. If the reader is not the intended recipient or agent responsible for delivering the message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. This communication may also contain data subject to U.S. export laws. If so, data subject to the International Traffic in Arms Regulation cannot be disseminated, distributed, transferred, or copied, whether incorporated or in its original form, to foreign nationals residing in the U.S. or abroad, absent the express prior approval of the U.S. Department of State. Data subject to the Export Administration Act may not be disseminated, distributed, transferred or copied contrary to U. S. Department of Commerce regulations. If you have received this communication in error, please notify the sender by reply e-mail and destroy the e-mail message and any physical copies made of the communication. 
Thank you. 
********************* 

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