[Isocops] IBEX ORbit# 331 ATS Approval (23 June 16 - 2 July 16) - v003 approval

Mon Jun 13 07:52:04 EDT 2016

All, 

I have looked at the orbit 331 ATS, 

IBEX_2016_175_o0331a_v003.scr, 

and I approve. 

The only constraint violations in 

IBEX_2016_175_o0331a_v003.ccvr 

are because we removed the 

ACT_SetSpinPulseProtectEnable Enable 

commands (2); the violations are expected. 

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

IBEX_2016_175_o0331a_v002.stf, 

except that the ATS has an SSR_DUMP_NEW command as well as SSR pointer reset commands. 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_2016_175_o0331a_v001.oef, 

and as verified with ibex_orbit. 

There is one star tracker outage. It starts about 3 1/2 hours before perigee and ends about an hour after perigee. 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 about 5 hours after that in the OEF and the ATS end time is 2+ 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_Orbit331_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 330 left us pointing in safe directions for the orbit 331 arc A ascending and descending sequences: 

ibex_rotate -o -u -0.001479,0.921313,0.388818 -w ibex-sun -t 2016/06:24:01:45:19 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.001479,+0.921313,+0.388818 

which is R.A. +90.092 Decl. +22.881 

missing R.A. +92.974 Decl. +23.395 (ibex-sun) 

error is R.A. +2.882 Decl. +0.514 

for a total 2.699 deg 

ibex_rotate -o -u -0.001479,0.921313,0.388818 -w ibex-sun -t 2016/06:27:15:45:54 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.001479,+0.921313,+0.388818 

which is R.A. +90.092 Decl. +22.881 

missing R.A. +96.762 Decl. +23.257 (ibex-sun) 

error is R.A. +6.670 Decl. +0.376 

for a total 6.148 deg 

The inertial precession 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 -0.075693,0.918906,0.387145 -w ibex-sun -t 2016/06:27:17:29:02 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.075693,+0.918906,+0.387145 

which is R.A. +94.709 Decl. +22.777 

missing R.A. +96.838 Decl. +23.254 (ibex-sun) 

error is R.A. +2.129 Decl. +0.477 

for a total 2.017 deg 

ibex_rotate -o -u -0.075693,0.918906,0.387145 -w ibex-sun -t 2016/06:27:19:04:08 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.075693,+0.918906,+0.387145 

which is R.A. +94.709 Decl. +22.777 

missing R.A. +96.908 Decl. +23.252 (ibex-sun) 

error is R.A. +2.199 Decl. +0.475 

for a total 2.079 deg 

ibex_rotate -o -u -0.075693,0.918906,0.387145 -w ibex-sun -t 2016/07:02:04:21:53 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.075693,+0.918906,+0.387145 

which is R.A. +94.709 Decl. +22.777 

missing R.A. +101.454 Decl. +23.036 (ibex-sun) 

error is R.A. +6.745 Decl. +0.259 

for a total 6.218 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 332 apogee: 

ibex_rotate -o -u -0.152111,0.91064,0.384183 -w ibex-sun -t 2016/07:02:06:31:20 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.152111,+0.910640,+0.384183 

which is R.A. +99.483 Decl. +22.593 

missing R.A. +101.541 Decl. +23.029 (ibex-sun) 

error is R.A. +2.058 Decl. +0.436 

for a total 1.947 deg 

ibex_rotate -o -u -0.152111,0.91064,0.384183 -w ibex-sun -t 2016-07-07T07:25:01.919Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.152111,+0.910640,+0.384183 

which is R.A. +99.483 Decl. +22.593 

missing R.A. +106.718 Decl. +22.517 (ibex-sun) 

error is R.A. +7.235 Decl. +0.076 

for a total 6.682 deg 

No Lo O-mode. 

There is no overlap with orbit 330 command by manual inspection or by checking at 

http://ibex.unh.edu/cgi-bin/ats.cgi . 

Command Approval Checklist is attached. 

Ken 

----- Original Message -----

From: "Wesley.Sheral" <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>, "Lockwood.Robert" <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>, "Perry.Tim" <tim.perry at orbitalatk.com>, "Tyler.Ryan" <ryan.tyler at orbitalatk.com>, "Wesley.Sheral" <sheral.wesley at orbitalatk.com> 
Sent: Friday, June 10, 2016 12:20:13 PM 
Subject: IBEX ORbit# 331 ATS Approval (23 June 16 - 2 July 16) 

Guys, 

Here are the planning files and ATS for Orbit# 331. 

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

Approvals are required before 13 June 16 @1000 UTC 

Note the following: 

1. No command to enable spin pulse protection 

2. Moon in LO FOV commands 

# 2016-06-24T22:41:40.857Z,MoonInLoFovStart,orbit:331 

# 2016-06-25T14:26:28.311Z,MoonInLoFovStop,orbit:331 

3. PERIGEE: Battery Balancing Commands 

# 2016-07-02T16:16:37.231Z,Perigee,orbit:331 

SetLongEclipseFlag TRUE $TIME=2016/07:02:16:00:00 

SetLongEclipseFlag FALSE $TIME=2016/07:02:17:30:00 

4. PERIGEE: APL SSR_Dump/Tracking Contact 

5. Command Load Constraint Violation Report 

IBEX_2016_175_o0331a_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 2016/06/24 00:16:15 UTC 

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

transition to science mode at 2016/06/27 18:34:08 UTC 

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

OTHER MESSAGES 

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

NO MESSAGES. 

Sheral R. Wesley 

IBEX Mission OPS 

CRS/CYGNUS Mission Planning 

Bldg. 2 Room 1337 

Office (703) 406-5641 

Cell (202) 236-0802 

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