[Isocops] IBEX Orbit# 327 ATS Approval (17 May 16 - 26 May 16) - v001 approval

Fri May 6 13:26:34 EDT 2016

All, 

Note: Off-pointing at arc B descending is 3.874 deg 
Off-pointing at orbit 328 apogee is 4.852 deg 
I have looked at the orbit 327 recovery ATS, 

IBEX_2016_138_o0327a_Recovery_v001.scr, 

and I approve. 

The only constraint violations in 

IBEX_2016_138_o0327a_Recovery_v001.ccvr 

are because we removed the 

ACT_SetSpinPulseProtectEnable Enable 

commands (2) and because of closely spaced contacts; the violations are expected. 

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

IBEX_2016_138_o0327a_v003.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_2016_138_o0327a_Recovery_v001.oef, 

and as verified with ibex_orbit. 

There are two star tracker outages. The first starts 1 1/2+ days after apogee and runs for almost two days. The second starts 8 hours before perigee and runs for 3+ hours. If the star tracker was operational, some despinning might be required due to the first outage. 

There are no moon in Lo FOV sessions. 

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

IBEX_Orbit327_RecoveryContacts.txt, 

for the 4 contacts in the ATS. The APL pass commands will be in a separate ATS. 

The sun precession maneuver at perigee of orbit 326 left us pointing in safe directions for the orbit 327 arc A ascending and descending sequences: 

ibex_rotate -o -r +54.139 -d +19.374 -w ibex-sun -t 2016/05:17:23:31:47 

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. +54.937 Decl. +19.527 (ibex-sun) 

error is R.A. +0.798 Decl. +0.153 

for a total 0.768 deg 

ibex_rotate -o -r +54.139 -d +19.374 -w ibex-sun -t 2016/05:22:02:19:48 

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. +59.180 Decl. +20.387 (ibex-sun) 

error is R.A. +5.041 Decl. +1.013 

for a total 4.848 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 +59.256 -d +20.403 -w ibex-sun -t 2016/05:22:04:07:56 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.479132,+0.805541,+0.348621 

which is R.A. +59.256 Decl. +20.403 

missing R.A. +59.256 Decl. +20.403 (ibex-sun) 

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

for a total 0.000 deg 

ibex_rotate -o -r +59.256 -d +20.403 -w ibex-sun -t 2016/05:22:05:38:02 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.479132,+0.805541,+0.348621 

which is R.A. +59.256 Decl. +20.403 

missing R.A. +59.320 Decl. +20.416 (ibex-sun) 

error is R.A. +0.064 Decl. +0.013 

for a total 0.061 deg 

ibex_rotate -o -r +59.256 -d +20.403 -w ibex-sun -t 2016/05:26:06:45:04 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.479132,+0.805541,+0.348621 

which is R.A. +59.256 Decl. +20.403 

missing R.A. +63.314 Decl. +21.190 (ibex-sun) 

error is R.A. +4.058 Decl. +0.787 

for a total 3.874 deg 

The sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 328 apogee: 

ibex_rotate -o -r +63.409 -d +21.205 -w ibex-sun -t 2016/05:26:09:11:58 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.417311,+0.833679,+0.361706 

which is R.A. +63.409 Decl. +21.205 

missing R.A. +63.409 Decl. +21.205 (ibex-sun) 

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

for a total 0.000 deg 

ibex_rotate -o -r +63.409 -d +21.205 -w ibex-sun -t 2016-05-31T08:49:26.849Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.417311,+0.833679,+0.361706 

which is R.A. +63.409 Decl. +21.205 

missing R.A. +68.566 Decl. +21.944 (ibex-sun) 

error is R.A. +5.157 Decl. +0.739 

for a total 4.852 deg 

No Lo O-mode. 

The transmitter off command from the last orbit 326 contact will execute after the orbit 327 ascending bus commands. This is seen via manual inspection and by checking at 

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

Otherwise there is no overlap with orbit 326 commands. 

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: Wednesday, May 4, 2016 6:44:24 PM 
Subject: IBEX Orbit# 327 ATS Approval (17 May 16 - 26 May 16) 

Guys, 

Here are the planning files and ATS for Orbit# 327. 

Please respond to this email thread with your comments and approvals 

Approvals are required before 6 May 16 @ 1800 UTC 

Note the following: 

1. No ACT_SetSpinPulseProtectEnable Enable commands 

2. Battery Balancing at PERIGEE 

2016-05-26T18:20:00.446Z,Perigee,orbit:327 

SetLongEclipseFlag TRUE $TIME=2016/05:26:18:00:00 

SetLongEclipseFlag FALSE $TIME=2016/05:26:19:30:00 

3. IBEX_Hi Gain Test 

Orbit# 327 APOGEE: IBEX_Hi Gain Test (05:23:04:00:36 - 05:23:08:15:41) 

4. Command Load Constraint Violation Report 

IBEX_2016_138_o0327a_Recovery_v001.scr 

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

HARD CONSTRAINT VIOLATIONS 

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

NO VIOLATIONS. 

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

SOFT CONSTRAINT VIOLATIONS 

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

IBX-CLC-006: Planned transmission at 2016/05/22 11:58:00 UTC - 2016/05/22 

13:02:00 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 7680.000 seconds) 

IBX-CLC-006: Planned transmission at 2016/05/22 14:58:00 UTC - 2016/05/22 

16:02:00 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 7680.000 seconds) 

IBX-CLC-006: Planned transmission at 2016/05/26 23:58:00 UTC - 2016/05/27 

01:02:00 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 7680.000 seconds) 

IBX-CLC-006: Planned transmission at 2016/05/27 01:58:00 UTC - 2016/05/27 

03:02:00 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 7680.000 seconds) 

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

transition to science mode at 2016/05/17 21:43:26 UTC 

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

transition to science mode at 2016/05/22 05:08:04 UTC 

*The contacts are extended to gather CSS Telemetry and set the CEU Spin Period* 

* no ACT_SetSpinPulseProtectEnable Enable commands* 

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

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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