[Isocops] IBEX ORbit# 377 ATS Approval (14 Aug 17 - 24 Aug 17) - v001 approval

Thu Aug 3 23:04:25 EDT 2017

All, 

I have looked at the orbit 377 ATS, 

IBEX_2017_226_o0377a_v001.scr, 

and I approve. 

The only constraint violations in 

IBEX_2017_226_o0377a_v001.ccvr 

are from a long contact 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_226_o0377a_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_226_o0377a_v001.oef, 

and as verified with ibex_orbit. 

There is one star tracker outage. The outage starts about 1/2 hour after perigee and runs for 7 1/2 hours. No despinning should be required due to this outage. 

There is one moon in Lo FOV session in arc A. The ATS start time is one hour after that in the OEF and the ATS end time is 11+ hours after 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_Orbit377_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 376 left us pointing in safe directions for the orbit 377 arc A ascending and descending sequences: 

ibex_rotate -o -u -0.760203,0.599769,0.249738 -w ibex-sun -t 2017/08:15:03:04:17 

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. +144.585 Decl. +14.081 (ibex-sun) 

error is R.A. +2.857 Decl. +0.381 

for a total 2.795 deg 

ibex_rotate -o -u -0.760203,0.599769,0.249738 -w ibex-sun -t 2017/08:18:20:03:47 

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. +148.001 Decl. +12.910 (ibex-sun) 

error is R.A. +6.273 Decl. +1.552 

for a total 6.289 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 -0.808015,0.544582,0.224815 -w ibex-sun -t 2017/08:18:21:46:55 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.808015,+0.544582,+0.224815 

which is R.A. +146.021 Decl. +12.992 

missing R.A. +148.069 Decl. +12.887 (ibex-sun) 

error is R.A. +2.048 Decl. +0.105 

for a total 1.998 deg 

ibex_rotate -o -u -0.808015,0.544582,0.224815 -w ibex-sun -t 2017/08:18:23:22:01 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.808015,+0.544582,+0.224815 

which is R.A. +146.021 Decl. +12.992 

missing R.A. +148.131 Decl. +12.866 (ibex-sun) 

error is R.A. +2.110 Decl. +0.126 

for a total 2.060 deg 

ibex_rotate -o -u -0.808015,0.544582,0.224815 -w ibex-sun -t 2017/08:23:12:53:05 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.808015,+0.544582,+0.224815 

which is R.A. +146.021 Decl. +12.992 

missing R.A. +152.455 Decl. +11.360 (ibex-sun) 

error is R.A. +6.434 Decl. +1.632 

for a total 6.497 deg 

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 378 apogee: 

ibex_rotate -o -u -0.85244,0.483348,0.1993 -w ibex-sun -t 2017/08:23:15:16:13 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.852440,+0.483348,+0.199300 

which is R.A. +150.446 Decl. +11.496 

missing R.A. +152.546 Decl. +11.325 (ibex-sun) 

error is R.A. +2.100 Decl. +0.171 

for a total 2.065 deg 

ibex_rotate -o -u -0.85244,0.483348,0.1993 -w ibex-sun -t 2017-08-28T14:13:48.556Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.852440,+0.483348,+0.199300 

which is R.A. +150.446 Decl. +11.496 

missing R.A. +156.975 Decl. +9.603 (ibex-sun) 

error is R.A. +6.529 Decl. +1.893 

for a total 6.692 deg 

No Lo O-mode. 

There is no overlap with orbit 376 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>, "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: Tuesday, August 1, 2017 11:07:43 AM 
Subject: IBEX ORbit# 377 ATS Approval (14 Aug 17 - 24 Aug 17) 

Guys, 

Here are the planning files and ATS for Orbit# 377 

Please respond to this email thread with questions and approvals 

Approvals are required before 4 Aug 17 @1900 UTC 

Note the following: 

1. Battery Balancing at PERIGEE 

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 

2. Moon in Lo FOV Commands 

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

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

3. Star Tracker Image Dump 

IBEX,USHI02,ADD,08/23/17,235,15:30:00,08/23/17,235,17:00:00,,LAHO 160K IBEX-3 Orbit# 377 Star Tracker Image Dump/Tracking Contact(14 Desc) 

4. Command Load Constraint Violation Report 

IBEX_2017_226_o0377a_v001.scr 

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

HARD CONSTRAINT VIOLATIONS 

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

NO VIOLATIONS. 

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

SOFT CONSTRAINT VIOLATIONS 

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

IBX-CLC-006: Planned transmission at 2017/08/23 15:28:00 UTC - 2017/08/23 

17:02:00 UTC exceeds the maximum contiguous transmission time of 

5400 seconds 

* IBEX,USHI02,ADD,08/23/17,235,15:30:00,08/23/17,235,17:00:00,,LAHO 160K IBEX-3 Orbit# 377 Star Tracker Image Dump/Tracking Contact(14 Desc)* 

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

transition to science mode at 2017/08/15 01:25:44 UTC 

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

transition to science mode at 2017/08/18 22:52:01 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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