[Isocops] IBEX ORbit# 372 ATS Approval (30 Jun 17 - 9 Jul 17) - v003 approval

Mon Jun 19 23:38:09 EDT 2017

All, 

Note: Angle at orbit 373 apogee after the perigee sun precession maneuver: 4.669 deg 

I have looked at the orbit 372 ATS, 

IBEX_2017_181_o0372a_v003.scr, 

and I approve. 

The only constraint violations in 

IBEX_2017_181_o0372a_v003.ccvr 

are from the removal of the 

ACT_SetSpinPulseProtectEnable Enable 

commands (2); the violations are expected. 

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

IBEX_2017_180_o0372a_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_2017_181_o0372a_v001.oef, 

and as verified with ibex_orbit. 

There is one star tracker outage. The outage starts 4 hours before 15 Re descending and runs for 1+ days. Some despinning may be required due to this outage. 

There are two moon in Lo FOV sessions in the OEF but only one in the ATS. The ISOC timing for the first session puts it before we ascend. The second session starts in arc A (OEF) (ATS - after apogee maneuver) and ends in arc B. The ATS start time is 16 hours after that in the OEF and the ATS end time is 3 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_Orbit372_Contacts.txt, 

for all contacts (4). The last contact ends after orbit 373 14 Re ascending. 

No battery cell balancing this orbit; we'll do it again in the next orbit. 

The inertial maneuver at perigee of orbit 371 left us pointing in safe directions for the orbit 372 arc A ascending and descending sequences: 

ibex_rotate -o -u -0.103638,0.916298,0.386856 -w ibex-sun -t 2017/06:30:11:46:29 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.103638,+0.916298,+0.386856 

which is R.A. +96.453 Decl. +22.759 

missing R.A. +99.371 Decl. +23.137 (ibex-sun) 

error is R.A. +2.918 Decl. +0.378 

for a total 2.714 deg 

ibex_rotate -o -u -0.103638,0.916298,0.386856 -w ibex-sun -t 2017/07:04:00:44:42 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.103638,+0.916298,+0.386856 

which is R.A. +96.453 Decl. +22.759 

missing R.A. +103.075 Decl. +22.864 (ibex-sun) 

error is R.A. +6.622 Decl. +0.105 

for a total 6.104 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 -0.176575,0.907134,0.382006 -w ibex-sun -t 2017/07:04:02:27:50 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.176575,+0.907134,+0.382006 

which is R.A. +101.015 Decl. +22.458 

missing R.A. +103.150 Decl. +22.859 (ibex-sun) 

error is R.A. +2.135 Decl. +0.401 

for a total 2.011 deg 

ibex_rotate -o -u -0.176575,0.907134,0.382006 -w ibex-sun -t 2017/07:04:04:02:56 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.176575,+0.907134,+0.382006 

which is R.A. +101.015 Decl. +22.458 

missing R.A. +103.220 Decl. +22.854 (ibex-sun) 

error is R.A. +2.205 Decl. +0.396 

for a total 2.073 deg 

ibex_rotate -o -u -0.176575,0.907134,0.382006 -w ibex-sun -t 2017/07:08:12:24:49 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.176575,+0.907134,+0.382006 

which is R.A. +101.015 Decl. +22.458 

missing R.A. +107.709 Decl. +22.461 (ibex-sun) 

error is R.A. +6.694 Decl. +0.003 

for a total 6.186 deg 

The sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 373 apogee: 

ibex_rotate -o -r +107.801 -d +22.449 -w ibex-sun -t 2017/07:08:14:41:14 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.282545,+0.879972,+0.381861 

which is R.A. +107.801 Decl. +22.449 

missing R.A. +107.801 Decl. +22.449 (ibex-sun) 

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

for a total 0.000 deg 

ibex_rotate -o -r +107.801 -d +22.449 -w ibex-sun -t 2017-07-13T12:46:51.451Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.282545,+0.879972,+0.381861 

which is R.A. +107.801 Decl. +22.449 

missing R.A. +112.786 Decl. +21.763 (ibex-sun) 

error is R.A. +4.985 Decl. +0.686 

for a total 4.669 deg 

No Lo O-mode. 

There is no overlap with orbit 371 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: "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" <fair-play at comcast.net>, "Ken Fairchild" <kwfairchild at gmail.com>, "Robert Lockwood" <Robert.Lockwood at OrbitalATK.com>, "Michelle Reno" <mreno at swri.edu>, "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: Friday, June 16, 2017 11:21:55 AM 
Subject: IBEX ORbit# 372 ATS Approval (30 Jun 17 - 9 Jul 17) 

Guys, 

Here are the planning files and ATS for Orbit# 372 

Please respond to this email thread with questions and approvals 

Approvals are required before 19 Jun 17 @1600 UTC 

Note the following: 

1. Perigee Sun Maneuver 

2017-07-08T14:26:14.000Z,ManeuverWindowStart,targetX:-0.2822951672731804,mvrDuration:900,targetZ:0.3818976860421977,targetY:0.8800361333092078,orbit:372 

2017-07-08T14:26:14.000Z,SunMvrBegin,extendedProperty(targetY):0.8800361333092078,extendedProperty(targetX):-0.2822951672731804,extendedProperty(targetZ):0.3818976860421977,extendedProperty(mvrDuration):900,orbit:372 

2017-07-08T14:41:14.000Z,SunMvrEnd,orbit:372 

2017-07-08T14:56:16.000Z,ManeuverWindowEnd,orbit:372 

2. IBEX_Lo Magnetotail Table Load 

IBEX,USAK01,ADD,06/30/17,181,12:15:00,06/30/17,181,13:15:00,,LAHO 160K IBEX-2 Orbit# 371 Tracking/MagnetoTail Contact(15 Asc) 

3. Command Load Constraint Violation Report 

IBEX_2017_181_o0372a_v001.scr 

========================== 

HARD CONSTRAINT VIOLATIONS 

========================== 

NO VIOLATIONS. 

========================== 

SOFT CONSTRAINT VIOLATIONS 

========================== 

IBX-CLC-016: No command to enable spin pulse protection was found after 

transition to science mode at 2017/06/30 10:18:36 UTC 

IBX-CLC-016: No command to enable spin pulse protection was found after 

transition to science mode at 2017/07/04 03:32:56 UTC 

============== 

OTHER MESSAGES 

============== 

NO MESSAGES. 

Sheral R. Wesley 

Sr Systems Engineer 

IBEX 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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