[Isocops] IBEX ORbit# 371 ATS (20 Jun 17 - 30 Jun 17) - v001 approval

Thu Jun 8 20:09:30 EDT 2017

All, 

I have looked at the orbit 371 ATS, 

IBEX_2017_171_o0371a_v001.scr, 

and I approve. 

The only constraint violations in 

IBEX_2017_171_o0371a_v001.ccvr 

are from the removal of the 

ACT_SetSpinPulseProtectEnable Enable 

commands (2); the violations are expected. 

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_171_o0371a_v001.oef, 

and as verified with ibex_orbit. 

There is one star tracker outage. The outage starts about 3 1/2 hours before perigee and runs for about 5 hours. No despinning should be required due to this outage. 

There is a short moon in Lo FOV session in the OEF but it does not appear in the ATS. (If it had, it would have been considered too short and would have been ignored.) 

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

IBEX_Orbit371_Contacts.txt, 

for all contacts (2). 

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 370 left us pointing in safe directions for the orbit 371 arc A ascending and descending sequences: 

ibex_rotate -o -u 0.049157,0.920145,0.388481 -w ibex-sun -t 2017/06:21:07:04:56 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.049157,+0.920145,+0.388481 

which is R.A. +86.942 Decl. +22.860 

missing R.A. +89.824 Decl. +23.417 (ibex-sun) 

error is R.A. +2.882 Decl. +0.557 

for a total 2.708 deg 

ibex_rotate -o -u 0.049157,0.920145,0.388481 -w ibex-sun -t 2017/06:24:22:04:51 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.049157,+0.920145,+0.388481 

which is R.A. +86.942 Decl. +22.860 

missing R.A. +93.659 Decl. +23.365 (ibex-sun) 

error is R.A. +6.717 Decl. +0.505 

for a total 6.198 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 -0.026022,0.921245,0.388111 -w ibex-sun -t 2017/06:24:23:47:59 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.026022,+0.921245,+0.388111 

which is R.A. +91.618 Decl. +22.837 

missing R.A. +93.735 Decl. +23.364 (ibex-sun) 

error is R.A. +2.117 Decl. +0.527 

for a total 2.017 deg 

ibex_rotate -o -u -0.026022,0.921245,0.388111 -w ibex-sun -t 2017/06:25:01:23:05 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.026022,+0.921245,+0.388111 

which is R.A. +91.618 Decl. +22.837 

missing R.A. +93.805 Decl. +23.363 (ibex-sun) 

error is R.A. +2.187 Decl. +0.526 

for a total 2.079 deg 

ibex_rotate -o -u -0.026022,0.921245,0.388111 -w ibex-sun -t 2017/06:29:12:00:14 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.026022,+0.921245,+0.388111 

which is R.A. +91.618 Decl. +22.837 

missing R.A. +98.417 Decl. +23.233 (ibex-sun) 

error is R.A. +6.799 Decl. +0.396 

for a total 6.269 deg 

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 372 apogee: 

ibex_rotate -o -u -0.103638,0.916298,0.386856 -w ibex-sun -t 2017/06:29:14:11:34 

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. +98.506 Decl. +23.227 (ibex-sun) 

error is R.A. +2.053 Decl. +0.468 

for a total 1.947 deg 

ibex_rotate -o -u -0.103638,0.916298,0.386856 -w ibex-sun -t 2017-07-04T12:17:26.543Z 

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. +103.580 Decl. +22.827 (ibex-sun) 

error is R.A. +7.127 Decl. +0.068 

for a total 6.570 deg 

No Lo O-mode. 

There is no overlap with orbit 370 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: Wednesday, June 7, 2017 6:24:17 PM 
Subject: IBEX ORbit# 371 ATS (20 Jun 17 - 30 Jun 17) 

Guys, 

Here are the planning files and ATS for Orbit# 370. 

Please respond to this email thread with your comments and approvals 

Approvals are required before 9 Jun 17 @1800 UTC 

Note the following: 

1. Battery Balancing at Perigee 

Orbit# 370 PERIGEE: Battery Balancing Commands 

# 2017-06-29T23:55:30.298Z,Perigee,orbit:371 

SetLongEclipseFlag TRUE $TIME=2017/06:30:00:00:00 

SetLongEclipseFlag FALSE $TIME=2017/06:30:01:30:00 

2. Command Load Constraint Violation Report 

IBEX_2017_171_o0371a_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 2017/06/21 05:36:41 UTC 

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

transition to science mode at 2017/06/25 00:53:05 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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