[Isocops] IBEX Orbit# 376 ATS (5 Aug 17 - 14 Aug 17) - v001 approval

Wed Jul 26 18:32:40 EDT 2017

All, 

I have looked at the orbit 376 ATS, 

IBEX_2017_217_o0376a_v001.scr, 

and I approve. 

The only constraint violations in 

IBEX_2017_217_o0376a_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_2017_217_o0376a_v002.stf, 

except the ATS has an SSR_DUMP_NEW command. This is expected as APL is being used for the dump pass. 

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_217_o0376a_v001.oef, 

and as verified with ibex_orbit. 

There are two star tracker outages. The first starts about 10 hours after orbit 375 perigee and ends about 20 hours after 15 Re ascending. The second starts 20 minutes before perigee and runs for about 7 1/2 hours. Some despinning may be required due to the first outage. 

There are two moon in Lo FOV sessions in arc B. The ATS start time of the first session is 2 hours after that in the OEF and the ATS end time is 8+ hours before that in the OEF. The ATS start time of the second session is about 6 hours after that in the OEF and the ATS and OEF end times are the same. Differences in timing are not unusual. 

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

IBEX_Orbit376_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 inertial maneuver at perigee of orbit 375 left us pointing in safe directions for the orbit 376 arc A ascending and descending sequences: 

ibex_rotate -o -u -0.652599,0.698897,0.292672 -w ibex-sun -t 2017/08:05:23:54:31 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.652599,+0.698897,+0.292672 

which is R.A. +133.038 Decl. +17.018 

missing R.A. +135.928 Decl. +16.758 (ibex-sun) 

error is R.A. +2.890 Decl. +0.260 

for a total 2.778 deg 

ibex_rotate -o -u -0.652599,0.698897,0.292672 -w ibex-sun -t 2017/08:09:13:41:49 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.652599,+0.698897,+0.292672 

which is R.A. +133.038 Decl. +17.018 

missing R.A. +139.313 Decl. +15.754 (ibex-sun) 

error is R.A. +6.275 Decl. +1.264 

for a total 6.151 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 -0.707368,0.652558,0.271659 -w ibex-sun -t 2017/08:09:15:24:57 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.707368,+0.652558,+0.271659 

which is R.A. +137.308 Decl. +15.763 

missing R.A. +139.383 Decl. +15.733 (ibex-sun) 

error is R.A. +2.075 Decl. +0.030 

for a total 1.997 deg 

ibex_rotate -o -u -0.707368,0.652558,0.271659 -w ibex-sun -t 2017/08:09:17:00:03 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.707368,+0.652558,+0.271659 

which is R.A. +137.308 Decl. +15.763 

missing R.A. +139.446 Decl. +15.715 (ibex-sun) 

error is R.A. +2.138 Decl. +0.048 

for a total 2.059 deg 

ibex_rotate -o -u -0.707368,0.652558,0.271659 -w ibex-sun -t 2017/08:14:03:51:16 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.707368,+0.652558,+0.271659 

which is R.A. +137.308 Decl. +15.763 

missing R.A. +143.741 Decl. +14.404 (ibex-sun) 

error is R.A. +6.433 Decl. +1.359 

for a total 6.358 deg 

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 377 apogee: 

ibex_rotate -o -u -0.760203,0.599769,0.249738 -w ibex-sun -t 2017/08:14:06:13:11 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.760203,+0.599769,+0.249738 

which is R.A. +141.728 Decl. +14.462 

missing R.A. +143.832 Decl. +14.372 (ibex-sun) 

error is R.A. +2.104 Decl. +0.090 

for a total 2.040 deg 

ibex_rotate -o -u -0.760203,0.599769,0.249738 -w ibex-sun -t 2017-08-19T07:36:36.557Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.760203,+0.599769,+0.249738 

which is R.A. +141.728 Decl. +14.462 

missing R.A. +148.456 Decl. +12.757 (ibex-sun) 

error is R.A. +6.728 Decl. +1.705 

for a total 6.757 deg 

No Lo O-mode. 

There is no overlap with orbit 375 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: Sunday, July 23, 2017 12:15:18 PM 
Subject: IBEX Orbit# 376 ATS (5 Aug 17 - 14 Aug 17) 

Guys, 

Here are the planning files and ATS for Orbit# 376. 

Please respond to this email thread with your comments and approvals 

Approvals are required before 27 July 17 @1800 UTC 

The ATS will be upload after the spacecraft has recovered from the Orbit# 375 Long Eclipse 

Note the following: 

1. APL-18 SSR_Dump/Tracking Contact 

IBEX,APL-18,ADD,08/14/17,226,08:30:00,08/14/17,226,09:30:00,,13re-Descending Perigee 2K-320K IBEX Orbit# 376 SSR_Dump/Tracking Contact(13 Desc) 

2. Moon in Lo FOV Commands 

2017-08-10T07:31:03.744Z,MoonInLoFovStart,orbit:376 

2017-08-12T02:19:31.561Z,MoonInLoFovStop,orbit:376 

2017-08-13T08:14:24.094Z,MoonInLoFovStart,orbit:376 

2017-08-14T02:18:54.398Z,MoonInLoFovStop,orbit:376 

3. Battery Balancing 

Orbit# 376 PERIGEE: Battery Balancing Commands 

# 2017-08-14T15:28:36.693Z,Perigee,orbit:376 

SetLongEclipseFlag TRUE $TIME=2017/08:14:15:00:00 

SetLongEclipseFlag FALSE $TIME=2017/08:14:16:30:00 

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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