[Isocops] IBEX Orbit# 326 ATS Approval (8 May 16 - 17 May 16) - v004 approval

Wed Apr 27 20:00:05 EDT 2016

All, 

Note: Off-pointing at arc B descending is 3.985 deg 
Off-pointing at orbit 327 apogee is 4.911 deg 

I have looked at the orbit 326 recovery ATS, 

IBEX_2016_129_o0326a_Recovery_v004.scr, 

and I approve. 

The only constraint violations in 

IBEX_2016_129_o0326a_Recovery_v001.ccvr 

are because we removed the 

ACT_SetSpinPulseProtectEnable Enable 

commands (2) as well as one about a long contact; the violations are expected. 

The PL commands in the v004 ATS match those in the v003 STF, 

IBEX_2016_129_o0326a_v003.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_2016_129_o0326a_Recovery_v001.oef, 

and as verified with ibex_orbit. 

There is one star tracker outage. The outage starts about an hour before 15 Re descending and runs for 5+ hours. If the star tracker was working, some despinning might be required due to the outage. 

There is one moon in Lo FOV session in arc B. The ATS start time is about 3 hours before that in the OEF and the ATS end time is about 8 hours before 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_Orbit326_RecoveryContacts.txt, 

for all contacts (3). 

No battery cell balancing this orbit; we'll do it again in the next orbit. 

The sun precession maneuver at perigee of orbit 325 left us pointing in safe directions for the orbit 326 arc A ascending and descending sequences: 

ibex_rotate -o -r +44.879 -d +17.024 -w ibex-sun -t 2016/05:08:13:22:47 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.677549,+0.674694,+0.292772 

which is R.A. +44.879 Decl. +17.024 

missing R.A. +45.670 Decl. +17.219 (ibex-sun) 

error is R.A. +0.791 Decl. +0.195 

for a total 0.781 deg 

ibex_rotate -o -r +44.879 -d +17.024 -w ibex-sun -t 2016/05:12:17:47:00 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.677549,+0.674694,+0.292772 

which is R.A. +44.879 Decl. +17.024 

missing R.A. +49.895 Decl. +18.311 (ibex-sun) 

error is R.A. +5.016 Decl. +1.287 

for a total 4.949 deg 

The sun 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 -r +49.970 -d +18.331 -w ibex-sun -t 2016/05:12:19:35:08 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.610550,+0.726852,+0.314506 

which is R.A. +49.970 Decl. +18.331 

missing R.A. +49.970 Decl. +18.331 (ibex-sun) 

error is R.A. +0.000 Decl. +0.000 

for a total 0.001 deg 

ibex_rotate -o -r +49.970 -d +18.331 -w ibex-sun -t 2016/05:12:21:05:14 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.610550,+0.726852,+0.314506 

which is R.A. +49.970 Decl. +18.331 

missing R.A. +50.032 Decl. +18.347 (ibex-sun) 

error is R.A. +0.062 Decl. +0.016 

for a total 0.060 deg 

ibex_rotate -o -r +49.970 -d +18.331 -w ibex-sun -t 2016/05:17:01:03:00 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.610550,+0.726852,+0.314506 

which is R.A. +49.970 Decl. +18.331 

missing R.A. +54.040 Decl. +19.353 (ibex-sun) 

error is R.A. +4.070 Decl. +1.022 

for a total 3.985 deg 

The sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 327 apogee: 

ibex_rotate -o -r +54.139 -d +19.374 -w ibex-sun -t 2016/05:17:03:39:19 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.552648,+0.764548,+0.331733 

which is R.A. +54.139 Decl. +19.374 

missing R.A. +54.139 Decl. +19.374 (ibex-sun) 

error is R.A. +0.000 Decl. +0.000 

for a total 0.001 deg 

ibex_rotate -o -r +54.139 -d +19.374 -w ibex-sun -t 2016-05-22T03:53:11.706Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.552648,+0.764548,+0.331733 

which is R.A. +54.139 Decl. +19.374 

missing R.A. +59.246 Decl. +20.401 (ibex-sun) 

error is R.A. +5.107 Decl. +1.027 

for a total 4.911 deg 

No Lo O-mode. 

There is no overlap with orbit 325 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: "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: Tuesday, April 26, 2016 3:25:39 AM 
Subject: IBEX Orbit# 326 ATS Approval (8 May 16 - 17 May 16) 

Guys, 

Here are the planning files and ATS for Orbit# 326. 

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

Approvals are required before 28 Apr 16 @1100 UTC. 

Note the following: 

1. No Battery Balancing commands 

2. APL-18 SSR_Dump commands were manually inserted because they straddled the 14re ASC crossing time 

3. Moon in Lo FOV Commands 

2016-05-13T11:33:24.289Z,MoonInLoFovStart,orbit:326 

2016-05-14T17:39:40.942Z,MoonInLoFovStop,orbit:326 

4. No Ascending SetSpinPulseProtectEnable Enable Commands 

5. Command Load Constraint Violation Report 

IBEX_2016_129_o0326a_Recovery_v001.scr 

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

HARD CONSTRAINT VIOLATIONS 

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

NO VIOLATIONS. 

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

SOFT CONSTRAINT VIOLATIONS 

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

IBX-CLC-006: Planned transmission at 2016/05/17 04:28:00 UTC - 2016/05/17 

06:02:00 UTC exceeds the maximum contiguous transmission time of 

5400 seconds 

*IBEX,AUWA01,ADD,05/17/16,138,04:30:00,05/17/16,138,06:00:00,,LAHO 64K IBEX Orbit# 326 Tracking Contact 

* CSS and CEU Spin Period Contact 

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

transition to science mode at 2016/05/08 11:34:23 UTC 

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

transition to science mode at 2016/05/12 20:35:16 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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