[Isocops] IBEX Orbit# 328 ATS Approval (26 May 16 - 4 Jun 16) - v001 approval

Mon May 16 00:16:03 EDT 2016

All, 

I have looked at the orbit 328 ATS, 

IBEX_2016_147_o0328a_v001.scr, 

and I approve. 

The only constraint violations in 

IBEX_2016_147_o0328a_v001.ccvr 

are because we removed the 

ACT_SetSpinPulseProtectEnable Enable 

commands (2) and because of a long SSR dump contact; the violations are expected. 

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

IBEX_2016_147_o0328a_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_147_o0328a_v001.oef, 

and as verified with ibex_orbit. 

There is one star tracker outage. It starts about 7 hours before perigee and runs for about 4 hours. 

There is one moon in Lo FOV session in arc A. The ATS start time is about 3 hours after that in the OEF and the ATS end time is about 20 minutes 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_Orbit328_Contacts.txt, 

for the 3 contacts in the ATS. The other contact will be a blind acq. 

We are doing battery cell balancing this orbit and the balancing commands are correct and offset by enough time from other commands. 

The sun precession maneuver at perigee of orbit 327 left us pointing in safe directions for the orbit 328 arc A ascending and descending sequences: 

ibex_rotate -o -r +63.409 -d +21.205 -w ibex-sun -t 2016/05:27:05:51:43 

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. +64.244 Decl. +21.317 (ibex-sun) 

error is R.A. +0.835 Decl. +0.112 

for a total 0.786 deg 

ibex_rotate -o -r +63.409 -d +21.205 -w ibex-sun -t 2016/05:30:21:16:11 

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. +68.065 Decl. +21.871 (ibex-sun) 

error is R.A. +4.656 Decl. +0.666 

for a total 4.382 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 0.377391,0.853683,0.358889 -w ibex-sun -t 2016/05:30:22:59:19 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.377391,+0.853683,+0.358889 

which is R.A. +66.151 Decl. +21.032 

missing R.A. +68.140 Decl. +21.882 (ibex-sun) 

error is R.A. +1.989 Decl. +0.850 

for a total 2.037 deg 

ibex_rotate -o -u 0.377391,0.853683,0.358889 -w ibex-sun -t 2016/05:31:00:34:25 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.377391,+0.853683,+0.358889 

which is R.A. +66.151 Decl. +21.032 

missing R.A. +68.208 Decl. +21.892 (ibex-sun) 

error is R.A. +2.057 Decl. +0.860 

for a total 2.099 deg 

ibex_rotate -o -u 0.377391,0.853683,0.358889 -w ibex-sun -t 2016/06:04:11:06:10 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.377391,+0.853683,+0.358889 

which is R.A. +66.151 Decl. +21.032 

missing R.A. +72.700 Decl. +22.501 (ibex-sun) 

error is R.A. +6.549 Decl. +1.469 

for a total 6.257 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 329 apogee: 

ibex_rotate -o -u 0.304185,0.87784,0.369958 -w ibex-sun -t 2016/06:04:13:26:20 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.304185,+0.877840,+0.369958 

which is R.A. +70.888 Decl. +21.713 

missing R.A. +72.792 Decl. +22.510 (ibex-sun) 

error is R.A. +1.904 Decl. +0.797 

for a total 1.936 deg 

ibex_rotate -o -u 0.304185,0.87784,0.369958 -w ibex-sun -t 2016-06-09T15:38:57.255Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.304185,+0.877840,+0.369958 

which is R.A. +70.888 Decl. +21.713 

missing R.A. +78.112 Decl. +22.956 (ibex-sun) 

error is R.A. +7.224 Decl. +1.243 

for a total 6.796 deg 

No Lo O-mode. 

There is no overlap with orbit 327 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: Friday, May 13, 2016 1:17:29 PM 
Subject: IBEX Orbit# 328 ATS Approval (26 May 16 - 4 Jun 16) 

Guys, 

Here are the planning files and ATS for Orbit# 328 

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

Approvals are required before 16 May 16 @1500 UTC 

Note the following: 

1. Inertial Maneuver Commands!!!!! 

2. Battery Balancing at PERIGEE 

2016-06-04T22:45:00.308Z,Perigee,orbit:328 

SetLongEclipseFlag TRUE $TIME=2016/06:04:22:00:00 

SetLongEclipseFlag FALSE $TIME=2016/06:04:23:30:00 

3. No ACT_SetSpinPulseProtectEnable Enable commands 

4. Moon in Lo FOV Commands 

2016-05-27T12:20:23.087Z,MoonInLoFovStart,orbit:328 

2016-05-28T02:30:35.098Z,MoonInLoFovStop,orbit:328 

5. Command Load Constraint Violation Report 

IBEX_2016_147_o0328a_v001.scr 

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

HARD CONSTRAINT VIOLATIONS 

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

NO VIOLATIONS. 

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

SOFT CONSTRAINT VIOLATIONS 

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

IBX-CLC-006: Planned transmission at 2016/06/05 05:28:00 UTC - 2016/06/05 

07:02:00 UTC exceeds the maximum contiguous transmission time of 

5400 seconds 

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

transition to science mode at 2016/05/27 04:12:16 UTC 

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

transition to science mode at 2016/05/31 00:04:27 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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