[Isocops] IBEX ORbit# 373 ATS Approval (9 Jul 17 - 18 Jul 17) - v001 approval

Thu Jun 29 23:45:20 EDT 2017

All, 

I have looked at the orbit 373 ATS, 

IBEX_2017_190_o0373a_v001.scr, 

and I approve. 

The only constraint violations in 

IBEX_2017_190_o0373a_v001.ccvr 

are from proximity of contacts and 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_2017_190_o0373a_v002.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_190_o0373a_v001.oef, 

and as verified with ibex_orbit. 

There are two star tracker outages. The first starts before orbit 372 15 Re descending and ends 3 1/2 hours after 15 Re ascending. The second starts 2 1/2 hours before perigee and runs for 6 1/2 hours. Some despinning may be required due to the first outage. 

There is one moon in Lo FOV session. It starts in arc A and ends in arc B. The ATS start time is four hours after that in the OEF and the ATS end time is 3 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_Orbit373_Contacts.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 sun precession maneuver at perigee of orbit 372 left us pointing in safe directions for the orbit 373 arc A ascending and descending sequences: 

ibex_rotate -o -r +107.801 -d +22.449 -w ibex-sun -t 2017/07:09:12:16:55 

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. +108.653 Decl. +22.309 (ibex-sun) 

error is R.A. +0.852 Decl. +0.140 

for a total 0.800 deg 

ibex_rotate -o -r +107.801 -d +22.449 -w ibex-sun -t 2017/07:13:01:13:42 

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. +112.288 Decl. +21.828 (ibex-sun) 

error is R.A. +4.487 Decl. +0.621 

for a total 4.202 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 -0.321566,0.872816,0.367134 -w ibex-sun -t 2017/07:13:02:56:50 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.321566,+0.872816,+0.367134 

which is R.A. +110.225 Decl. +21.539 

missing R.A. +112.362 Decl. +21.819 (ibex-sun) 

error is R.A. +2.137 Decl. +0.280 

for a total 2.006 deg 

ibex_rotate -o -u -0.321566,0.872816,0.367134 -w ibex-sun -t 2017/07:13:04:31:56 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.321566,+0.872816,+0.367134 

which is R.A. +110.225 Decl. +21.539 

missing R.A. +112.431 Decl. +21.810 (ibex-sun) 

error is R.A. +2.206 Decl. +0.271 

for a total 2.067 deg 

ibex_rotate -o -u -0.321566,0.872816,0.367134 -w ibex-sun -t 2017/07:17:14:13:00 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.321566,+0.872816,+0.367134 

which is R.A. +110.225 Decl. +21.539 

missing R.A. +116.924 Decl. +21.155 (ibex-sun) 

error is R.A. +6.699 Decl. +0.384 

for a total 6.251 deg 

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 374 apogee: 

ibex_rotate -o -u -0.393433,0.847229,0.35695 -w ibex-sun -t 2017/07:17:16:26:56 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.393433,+0.847229,+0.356950 

which is R.A. +114.909 Decl. +20.913 

missing R.A. +117.013 Decl. +21.138 (ibex-sun) 

error is R.A. +2.104 Decl. +0.225 

for a total 1.977 deg 

ibex_rotate -o -u -0.393433,0.847229,0.35695 -w ibex-sun -t 2017-07-22T17:36:35.558Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.393433,+0.847229,+0.356950 

which is R.A. +114.909 Decl. +20.913 

missing R.A. +122.014 Decl. +20.160 (ibex-sun) 

error is R.A. +7.105 Decl. +0.753 

for a total 6.696 deg 

No Lo O-mode. 

There is no overlap with orbit 372 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>, "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: Tuesday, June 27, 2017 10:09:07 AM 
Subject: IBEX ORbit# 373 ATS Approval (9 Jul 17 - 18 Jul 17) 

Guys, 

Here are the planning files and ATS for Orbit# 373. 

Please respond to this email thread with your comments and approvals 

Approvals are required before 28 Jun 17 @2100 UTC 

Note the following: 

1. OEF Generation 

Because there was a PERIGEE sun maneuver in Orbit# 372, PERIGEE in Orbit# 371 was used to 

generate the OEF 

2. Battery Balancing at PERIGEE 

Orbit# 373 PERIGEE: Battery Balancing Commands 

# 2017-07-18T02:02:42.120Z,Perigee,orbit:373 

SetLongEclipseFlag TRUE $TIME=2017/07:18:01:00:00 

SetLongEclipseFlag FALSE $TIME=2017/07:18:02:30:00 

3. Moon in Lo FOV Commands 

# 2017-07-12T06:58:20.524Z,MoonInLoFovStart,orbit:373 

# 2017-07-13T08:13:28.981Z,MoonInLoFovStop,orbit:373 

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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