[Isocops] IBEX ORbit# 375 ATS Approval (27 Jul 17 - 5 Aug 17) - v001/v002 approval

Tue Jul 18 02:10:49 EDT 2017

All, 

I have looked at the orbit 375 ATS files, 

IBEX_2017_208_o0375a_pre_eclipse_v001.scr 

and 

IBEX_2017_208_o0375a_post_eclipse_v002.scr, 

and I approve. 

The only constraint violations in 

IBEX_2017_208_o0375a_v001.ccvr 

are due to proximity/length of contacts, the eclipse and from the removal of the 

ACT_SetSpinPulseProtectEnable Enable 

commands (2); the violations are expected. 

The PL commands in the v001/v002 ATS files match those in the v003 STF, 

IBEX_2017_208_o0375a_v003.stf. 

Ascending and descending command sequences are consistent with each other and 15 Re ascending, the apogee maneuver time, the eclipse and 15 Re descending as determined form the OEF, 

IBEX_2017_208_o0375a_v001.oef, 

and as verified with ibex_orbit. 

There is one star tracker outage. The outage starts about an hour before perigee and runs for about 11 1/2 hours. No despinning should be required due to this outage. 

There is one moon in Lo FOV session but it occurs while the payload is off due to the eclipse. 

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

IBEX_Orbit375_Contacts.txt, 

for all contacts (6). There will also be several post-eclipse contacts with blind acqs. 

No battery cell balancing because of the eclipse. 

The inertial maneuver at perigee of orbit 374 left us pointing in safe directions for the orbit 375 arc A ascending and descending sequences: 

ibex_rotate -o -u -0.530544,0.781435,0.328455 -w ibex-sun -t 2017/07:27:21:12:37 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.530544,+0.781435,+0.328455 

which is R.A. +124.174 Decl. +19.175 

missing R.A. +127.087 Decl. +19.055 (ibex-sun) 

error is R.A. +2.913 Decl. +0.120 

for a total 2.755 deg 

ibex_rotate -o -u -0.530544,0.781435,0.328455 -w ibex-sun -t 2017/07:31:11:10:32 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.530544,+0.781435,+0.328455 

which is R.A. +124.174 Decl. +19.175 

missing R.A. +130.579 Decl. +18.197 (ibex-sun) 

error is R.A. +6.405 Decl. +0.978 

for a total 6.145 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 -0.592252,0.743311,0.311008 -w ibex-sun -t 2017/07:31:12:53:40 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.592252,+0.743311,+0.311008 

which is R.A. +128.547 Decl. +18.120 

missing R.A. +130.650 Decl. +18.180 (ibex-sun) 

error is R.A. +2.103 Decl. +0.060 

for a total 1.999 deg 

ibex_rotate -o -u -0.592252,0.743311,0.311008 -w ibex-sun -t 2017/07:31:14:28:46 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.592252,+0.743311,+0.311008 

which is R.A. +128.547 Decl. +18.120 

missing R.A. +130.715 Decl. +18.164 (ibex-sun) 

error is R.A. +2.168 Decl. +0.044 

for a total 2.061 deg 

ibex_rotate -o -u -0.592252,0.743311,0.311008 -w ibex-sun -t 2017/08:05:00:17:20 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.592252,+0.743311,+0.311008 

which is R.A. +128.547 Decl. +18.120 

missing R.A. +135.053 Decl. +17.051 (ibex-sun) 

error is R.A. +6.506 Decl. +1.069 

for a total 6.293 deg 

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 376 apogee: 

ibex_rotate -o -u -0.652599,0.698897,0.292672 -w ibex-sun -t 2017/08:05:02:31:49 

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. +135.141 Decl. +17.025 (ibex-sun) 

error is R.A. +2.103 Decl. +0.007 

for a total 2.011 deg 

ibex_rotate -o -u -0.652599,0.698897,0.292672 -w ibex-sun -t 2017-08-10T01:14:57.970Z 

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. +139.779 Decl. +15.618 (ibex-sun) 

error is R.A. +6.741 Decl. +1.400 

for a total 6.618 deg 

No Lo O-mode. 

There is no overlap with orbit 374 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: Thursday, July 13, 2017 5:00:28 PM 
Subject: IBEX ORbit# 375 ATS Approval (27 Jul 17 - 5 Aug 17) 

Guys, 

Here are the planning files and ATS for Orbit# 375. 

I have broken the ATS into two parts . 

V001 ATS is Pre-Eclipse and V002 is Post-Eclipse 

Please respond to this email thread with comments, questions and approvals 

Approvals are required before 17 July 17 @ 1800 UTC. 

Note the following: 

1. Long Eclipse 

2017-08-02T08:57:09.510Z,EclipseEntry,moderate:false,long:true,orbit:375 

2017-08-02T13:54:40.702Z,EclipseExit,moderate:false,long:true,orbit:375 

2. Command Load Constraint Violation Report (CCVR) 

IBEX_2017_208_o0375a_v001.scr 

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

HARD CONSTRAINT VIOLATIONS 

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

NO VIOLATIONS. 

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

SOFT CONSTRAINT VIOLATIONS 

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

IBX-CLC-006: Planned transmission at 2017/08/01 11:58:00 UTC - 2017/08/01 

13:32:00 UTC exceeds the maximum contiguous transmission time of 

5400 seconds 

IBX-CLC-006: Planned transmission at 2017/08/02 05:28:00 UTC - 2017/08/02 

06:07:00 UTC is followed by one or more additional transmissions 

which, when combined, exceed the maximum transmission time of 5400 

seconds within a 18000-second window (total planned transmission 

time this window is 6180.000 seconds) 

IBX-CLC-006: Planned transmission at 2017/08/02 07:28:00 UTC - 2017/08/02 

08:32:00 UTC is preceded by one or more additional transmissions 

which, when combined, exceed the maximum transmission time of 5400 

seconds within a 18000-second window (total planned transmission 

time this window is 6180.000 seconds) 

IBX-CLC-006: Planned transmission at 2017/08/05 03:28:00 UTC - 2017/08/05 

05:02:00 UTC exceeds the maximum contiguous transmission time of 

5400 seconds 

IBX-CLC-015: Battery charge falls below minimum from 2017/08/02 11:49:09 UTC - 

2017/08/02 14:12:40 UTC. Lowest charge level is 0.000000 

watt-minutes during this interval. 

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

transition to science mode at 2017/07/27 19:40:25 UTC 

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

transition to science mode at 2017/07/31 13:58:46 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 

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Thank you. 
********************* 

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