[Isocops] IBEX Orbit# 316 ATS Approval (7 Feb 16 - 16 Feb 16) - v001 approval

Thu Jan 28 10:26:21 EST 2016

All, 

I have looked at the orbit 316 ATS, 

IBEX_2016_038_o0316a_v001.scr, 

and I approve. 

There are no constraint violations in 

IBEX_2016_038_o0316a_v001.ccvr. 

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

IBEX_2016_038_o0316a_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_038_o0316a_v001.oef, 

and as verified with ibex_orbit. 

There is one star tracker outage. It starts about 8 hours before apogee and runs for 3+ days. Some despinning may be required due to this outage. 

There is one moon in Lo FOV session that starts in arc A and runs into arc B. The ATS start time is about an hour after that in the OEF and the ATS end time is about 3 1/2 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_Orbit316_Contacts.txt 

for the two contacts in the ATS. The APL contact commands will be in a separate ATS. 

There is an eclipse near perigee and the LE flag set and unset commands follow Ryan's recommendations and are offset by enough time from other commands. 

The inertial maneuver at perigee of orbit 315 left us pointing in safe directions for the orbit 316 arc A ascending and descending sequences: 

ibex_rotate -o -u 0.743979,-0.568362,-0.351368 -w ibex-sun -t 2016/02:07:15:29:53 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.743979,-0.568362,-0.351368 

which is R.A. +322.622 Decl. -20.571 

missing R.A. +320.542 Decl. -15.418 (ibex-sun) 

error is R.A. +2.080 Decl. +5.153 

for a total 5.519 deg 

ibex_rotate -o -u 0.743979,-0.568362,-0.351368 -w ibex-sun -t 2016/02:11:02:27:13 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.743979,-0.568362,-0.351368 

which is R.A. +322.622 Decl. -20.571 

missing R.A. +323.997 Decl. -14.333 (ibex-sun) 

error is R.A. +1.375 Decl. +6.238 

for a total 6.374 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 0.757916,-0.594731,-0.268062 -w ibex-sun -t 2016/02:11:04:10:21 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.757916,-0.594731,-0.268062 

which is R.A. +321.879 Decl. -15.549 

missing R.A. +324.067 Decl. -14.310 (ibex-sun) 

error is R.A. +2.188 Decl. +1.239 

for a total 2.450 deg 

ibex_rotate -o -u 0.757916,-0.594731,-0.268062 -w ibex-sun -t 2016/02:11:05:45:27 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.757916,-0.594731,-0.268062 

which is R.A. +321.879 Decl. -15.549 

missing R.A. +324.131 Decl. -14.288 (ibex-sun) 

error is R.A. +2.252 Decl. +1.261 

for a total 2.515 deg 

ibex_rotate -o -u 0.757916,-0.594731,-0.268062 -w ibex-sun -t 2016/02:15:13:19:55 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.757916,-0.594731,-0.268062 

which is R.A. +321.879 Decl. -15.549 

missing R.A. +328.279 Decl. -12.824 (ibex-sun) 

error is R.A. +6.400 Decl. +2.725 

for a total 6.776 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 317 apogee: 

ibex_rotate -o -u 0.838386,-0.453919,-0.301771 -w ibex-sun -t 2016/02:15:15:24:12 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.838386,-0.453919,-0.301771 

which is R.A. +331.568 Decl. -17.564 

missing R.A. +328.365 Decl. -12.794 (ibex-sun) 

error is R.A. +3.203 Decl. +4.770 

for a total 5.683 deg 

ibex_rotate -o -u 0.838386,-0.453919,-0.301771 -w ibex-sun -t 2016-02-20T14:14:48.778Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.838386,-0.453919,-0.301771 

which is R.A. +331.568 Decl. -17.564 

missing R.A. +333.250 Decl. -11.074 (ibex-sun) 

error is R.A. +1.682 Decl. +6.490 

for a total 6.691 deg 

Lo O-mode in arc A (plan 6,7,1,1). O-mode timing matches that specified in the ISN season memo. There is more than 1 hour between the end of the ascending sequence and the start of O-mode and also more than an hour after O-mode ends and the start of the descending sequence. 

There is no overlap with orbit 315 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: Monday, January 25, 2016 3:58:06 PM 
Subject: IBEX Orbit# 316 ATS Approval (7 Feb 16 - 16 Feb 16) 

Guys, 

Here are the planning files and ATS for Orbit# 316. Please respond to this email thread with your questions, comments and approvals. 

All approvals are required before 28 Jan 16 @1800 UTC 

Note the following: 

1. Moderate Eclipse at PERIGEE 

Min voltage expected is 3.70V 

# 2016-02-16T01:18:32.802Z,Perigee,orbit:316 

# 2016-02-16T03:39:50.206Z,EclipseEntry,moderate:true,long:false,orbit:316 

# 2016-02-16T04:31:35.154Z,EclipseExit,moderate:true,long:false,orbit:316 

SetLongEclipseFlag TRUE $TIME=2016/02:16:01:30:00 

SetLongEclipseFlag FALSE $TIME=2016/02:16:04:35:00 

2. Arc-A O-MODE Commands 

3. Moon in Lo FOV Commands 

4. APL-18 SSR_Dump/Tracking Contact 

IBEX,APL-18,ADD,02/15/16,046,21:30:00,02/15/16,046,22:30:00,,10re-Descending Perigee 2K-320K IBEX Orbit# 316 SSR_Dump/Tracking Contact 

5. Command Load Constraint Violation Report 

IBEX_2016_038_o0316a_v001.scr 

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

HARD CONSTRAINT VIOLATIONS 

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

NO VIOLATIONS. 

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

SOFT CONSTRAINT VIOLATIONS 

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

NO VIOLATIONS. 

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

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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